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bitpie苹果版下载官网|owc

作者： bitpie苹果版下载官网

2024-03-07 20:25:30

从5G到6G, 无线电通信+无线光通信？ —— 聊聊OWC - 知乎

从5G到6G, 无线电通信+无线光通信？ —— 聊聊OWC - 知乎切换模式写文章登录/注册从5G到6G, 无线电通信+无线光通信？ —— 聊聊OWC临菲信息技术港从科普到学术前沿Wireless, Where to Go ？长波 → 短波 → 超短波 → 微波 → 太赫兹 → 光！文件大小不能超过5M，有兴趣者可在“临菲信息技术港”下载PDF完整文档，或关注公众号“lynchpin2012”阅读全文. 无线通信最初的无线通信是“低频”的无线通信。一开始是长波，可以沿着地球表面传播，没啥阻挡，只要功率足够大，可以传很远；然后是短波，短波有地波传播和天波传播，天波一跳可以传上千公里；这些最早的无线通信，至今仍然有用武之地。后来，超短波、微波（包括毫米波）大行其道，成了无线通信的主战场。过去，无线通信的发展，可以说是从“低端频率”向“高端频率”不断发展，未来呢？依然如此！太赫兹、光无线，会登上历史舞台。OWC这个缩写近年来变得比较流行，它的全文是：Optical Wireless Communication，即光无线通信。“光无线通信”中，“光”是指信号的传播介质为“光”，“无线”是指不需要“线”(例如光纤)来传播光。尽管光波和无线电波都属电磁波，但人们还是习惯把“光通信”与“电通信”区别开来。由于“无线电通信”已经先入为主地把“电”省掉，成为了“无线通信”，那“无线光通信”的“光”就不能再省啦！当然，如果按OWC直译叫“光无线通信”的话，就没啥混淆的了。不过，本文有时还是像很多人那样说“无线光通信”。当然，“无线光通信”≠“无线通信”+“光通信”！还是有人想把“无线电通信”和“无线光通信”统一起来，本来它们也就在“电磁频谱”的统一概念之下。但是，同在“电磁频谱”的“两种无线”通信如何区分开来？有人就把如今大家说的无线通信叫做“射频通信”，英文是“Radio Frequency （RF） Communication”[1][2]，它们说的RFC，其实就是我们所的无线电通信。这样，“无线通信”就有了比以前更丰富的内涵，它就包含了“射频（无线）通信”和“光无线通信”。本文中，当要与“无线电通信”相提并论的时候，我们叫OWC“无线光通信”；但当与英文保持一致更为方便时，我们就说“光无线通信”。无线电通信（RFC）的频段无线电通信即前面说的射频无线通信，至于射频（RF）的波段究竟是多少，好像并没有专门、统一的权威定义。先说说RF的低端百度百科说：射频（RF）“表示可以辐射到空间的电磁频率，频率范围从300KHz～300GHz之间”。不过，能不能“辐射到空间”还要看天线能做多大，如果天线能做很大很大的话，能“辐射到空间”的频率就可以很低，甚至低于300KHz。例如，长波通信，它的波长范围为10～1km，“射频（RF）”就是30～300kHz，所以又叫低频（LF）通信；还有更低RF的通信：甚低频（VLF）通信，频率为3～30kHz。为什么要用这么低的频率呢，做海上海下通信的人会很清楚，本文后面讲水下通信的时候，也会讲到。也有的文献就把RF的低端拉到了3KHz：“The RF band lies between 3 kHz and 300 GHz of the electromagnetic spectrum.”[2].再说说RF的高端上面说的RF的高端是300GHz，是否合适呢？300GHz是什么概念？注意！30 GHz~300 GHz对应的波长是10 mm~1 mm，所以300GHz是毫米波的高端！那么RF的高端是不是就是毫米波的高端300 GHz？有人说：别忘了太赫兹，我们正在做太赫兹呢！太赫兹（Terahertz，THz），是电磁波频率的单位，1THz=1000GHz，太赫兹波是比毫米波更高频率的电磁波。不少人说太赫兹是指从毫米波的高端300 GHz（即0.3THz）到远红外光边缘3000 GHz（即3THz），也有人说从0.1THz开始就算太赫兹了。不管他们怎么说，把RF的高端说成3000GHz好像比较合适，因为再高就到光那里了。说了很多，RF这个“射频”究竟是多少？姑且就算从KHz到THz吧。在重复一下，前面所谓的“射频RF通信”，就是指现在大家所说的“无线（电）通信”，从长波、短波、超短波、微波（包含毫米波）到正在开发的太赫兹！根据2018年的《中华人民共和国无线电频率划分规定》，无线电频谱可分为下面表中的 14 个频段，最高端是300-3000GHz。无线光通信（OWC）的频段那么，无线光通信，或是或光无线通信OWC，又包含些啥频段呢？当前说的OWC是指用红外线（infrared ，IR）、可见光（visible light， VL）或紫外线（ultraviolet ，UV）进行的通信，学究一点的说法就是OWC的传播介质是红外线IR、可见光VL、紫外线UV。红外线IR百度百科说，红外线是波长介于微波与可见光之间的电磁波，波长在1mm到760纳米（nm）之间，比红光长的非可见光。红外又分为：近红外(Near Infra-red，NIR)，波长 0.7~2.5μm；中红外(Middle Infra-red，MIR)，波长2.5~25μm；远红外(Far Infra-red，FIR)，波长25~500μm。可见光VL百度百科说，人眼可见光的范围是4.2×10^14～7.8×10^14Hz，也就是420THz~780THz。维基百科上说的可见光的波长是400nm~700nm,频率范围是430THz~790THz。紫外线UV百度百科说，紫外线指的是电磁波谱中波长从 10nm～400nm 辐射的总称，不能引起人们的视觉。维基百科说的与百度百科完全一致，紫外线的波长是10nm~400nm，频率范围是790THz~30PHz。IR、VL、UV通信特点这里先给一个表，从整体上说一下利用IR、VL和UV作为传输媒介的OWC，具体系统的介绍在后面就会看到。IR、VL、UV通信概要，来自文献[2]LiFi、VLC、OCC、FSO的介绍在后面。全频谱这里给几个图表，以不同形式描述电磁频谱，根据自己喜好，可以重点看一个。首先，在维基百科上找了个图，把它翻转过来（以便做无线电通信的习惯从左至右频率增高），再把RF无线通信和光无线通信（OWC）放在相应的频段，我们就看到了“RFC+OWC”即“无线电通信+无线光通信”的频谱全景。再给一个图，来自参考文献[5]。它把电磁频谱分为两部分，一部分是无线电通信、另一部分无线光通信，很清楚。英文的翻译见后面，还有一张大表。根据文献[2]中的一个表格，经过整理和翻译，形成如下一个表格，很详细。这个表格我们曾经在“临菲信息技术港”公众号发过的。上表中微波部分的频段划分，与平常大家熟悉的不太一样，也许是它考虑的是国外的通信频段吧。为了弥补这个不足，我们给出我国微波频段的划分，见下表。常用字母代码和业务频段对应表（来源：中华人民共和国无线电频率划分规定，2018）（原表注：对于空间无线电通信，K和Ka频段一般只用字母代码Ka表示；相应代码及频段范围非正式标准，仅作简化称呼参考之用。）LED可见光通信可见光通信VLC（Visible Light Communication）可能是当前光无线通信中最热闹的了。通过光来发信号是众所周知的事，例如手电筒就是一个即可照明又可以发信号的通信工具，像发电报那样控制手电筒的开关就可以发送摩尔斯电码，当然，别在乎这种“电报”的传输速率。所以，“闪烁”的光，可以是一种通信信号，只要它的闪烁能反映我们要传达的信息就行。LED ——光信号“发射天线”可见光通信（VLC）很多都采用LED灯作为发射器，接收器用光电探测器（photodetectors，PD）。LED相当于RF无线通信系统中的发射天线，PD相当于接收天线。不同的是，RF的一个天线既可以收又可以发，但VLC的收、发还没办法用同一个“天线”来执行。当然，LED比“天线”的好处在于它是灯具——具有照明功能——边照明边发射通信信号，是不是可以节省通信用的能源？基于LED的可见光通信，自然在需要照明的地方最实惠，家里的卧室、书房、客厅，公司的会议室、办公室、接待室，商场、机场、车站、码头、医院、机关、学校……,无处不需要照明，“照明即通信”！把LED安装在天花板上，它们一个个就是发射信号的“灯泡天线”！LED灯怎么可以发射通信信号？简单地说就是它可以快速闪烁，快到人眼感觉不出来，就像过去的胶片电影，24帧每秒的断续画面，我们看起来却是连续的。LED灯的闪烁是靠对光很敏感（而不是像我们人眼那样反映迟钝）的光电探测器PD来感知的，也就是光电二极管，PD把光的变化转变为电信号，后面的处理就和一般的通信原理差不多了。LED的麻烦事LED光通信也有些麻烦事，例如，要在电脑笔记本或手机上安装一个或几个LED灯，还是比较麻烦，特别是，手机开着个LED灯进行通信好像也不太舒服，所以，目前LED光通信主要用于下行，上行可以考虑用红外线等。LED光的另一个麻烦事可能是由谁来把那么高速的数据传到LED灯上。有个PLC（Power Line Communication），叫电力线通信，本来它可以很方便地把信号送到天花板的LED上，但电力线的带宽差太多了，况且电力线的信号传输特性也不怎么样。还是直接拉光纤？或者干脆把光纤和电力线做在一起？重要发展关于用LED光进行通信的早期论文，有一个日本学生在2004年读博士的时候，在IEEE Transactions on Consumer Electronics发了一篇长文[3]，现在这篇文章在IEEE Xplore上的全文阅读（Full Text Views）超过了2万，上千次被引用，到现在还有人看这篇文献。中国LED光通信的研究和开发也不错，复旦大学和解放军信息工程大学等单位做了不少贡献。复旦大学迟楠教授在2014年出版了专著《LED可见光通信技术》（清华大学出版社）；解放军信息工程大学在2018年中国首届中国国际智能产业博览会上，发布了全球首款商品级超宽带可见光通信专用芯片组，中国工程院院士邬江兴教授进行了现场演讲。还想说一下，LED灯也可以构成阵列用，就像天线阵那样，可以有LED的MIMO系统，可以进行波束形成（beamforming）或预编码（precoding）等等。LiFi与WiFi现在说一下LiFi。LiFi是“Light fidelity”的缩写，直译就是“光保真”。有不少人喜欢说可见光通信就是LiFi，其实未必，就像不能认为无线通信就是WiFi一样。LiFi虽然也属于光无线通信，但它不一定完全是可见光通信（VLC）；反过来，可见光通信系统，未必就是LiFi。LiFi和VLC的主要区别是: （1）VLC是指“可见光”通信，LiFi在下行使用VL，所以LiFi的下行是可见光通信；但上行通常是IR、VL或UV，它们是看不见的，所以不属于“可见光通信”，所以，一句话：LiFi的下行是VLC，上行不是。（2）VLC系统可能是单向传输的，也可能是双向的，而LiFi显然必须是双向的，否则我们怎么上传东西呢。（3）LiFi提供无缝的用户移动性，而VLC并没有说一定要有移动性支持;VLC系统可能是点对点，也可能是点对多点，或者多点对点，而LiFi系统必须包括多用户通信，也就是说必须是点对多点或者多点对点。只有当VLC系统具有LiFi特性（例如，多用户通信、点对多点和多点对点通信以及无缝的用户移动性）时，它才会被视为LiFi；另一方面，LiFi系统只有在VL作为传输介质时才能被视为VLC。一句话，可见光通信VLC只是一个宽泛的定义，它仅仅是针对传输媒介来说的，只要是可见光作为传输媒介的，就叫VLC；而LiFi是一种类似WiFi的特定网络，它只是用到了VLC而已。从文字形象和实际应用上，LiFi和WiFi都差不多，只是前面一个用的是光，后面一个是RF。有人担心WiFi的辐射会对人造成伤害，LiFi就不会有这个问题吧。LiFi不会像WiFi那样，加了密码还担心会不会被别人蹭用甚至信息被邻居截获。LiFi就不用担心信号会被邻居收到，除非你的光可以照射到邻居家去。所以有人懒得给LiFi加接入密码。当然LiFi也有不如WiFi的地方，比如，在客厅安的LED，就很难照射到卫生间去，想在卫生间像WiFi那样上网就只有在卫生间安装LED灯了，因为，要靠光的到处反射构成非视线（NLOS）通信是很难的，普通物体对光的反射是很弱的，除非到处是反射镜也许还行。LiFi与WiFi的比较相机通信（OCC）相机通信，有点奇怪？OCC（Optical Camera Communication），叫光学相机通信，通常就叫相机通信。图像传感器 ——光信号的“接收天线”现在的相机好多都不用胶片了，是用图像传感器（image sensor，IS），它能把光学图像转换成电信号，所以才有数码照片保存在手机里。显然，这种图像传感器就可以当成光信号的接收“天线”。图像传感器也就是大家通常说的CCD或者CMOS。当然，严格地说，CCD和CMOS其实是图像传感器根据不同类型元器件的两个分类。CCD是电荷耦合元件（Charge Coupled Device），CMOS是金属氧化物半导体元件（Complementary Metal-Oxide Semiconductor）。CMOS没有CCD费电，据说手机大都用的是CMOS。下图是相机通信的原理示意图，来自参考文献[2]。图像传感器可以轻松捕获、并且区分两个发射源来的信号，其中，一个信号来自汽车尾部的LED阵列，另一个信号来自交通灯。当然，背景噪声也能被分“接收”下来。要注意一下，这里说的“噪声”不是“声”，而是光，对信号光而言，其它的光就相当于是“噪声”了。类似的图在文献[4]中也有：图像传感器其实是由很多PD构成的一个阵列（每个PD就是一个像素），所以图像传感器就类似于RF无线通信的一个天线阵，而且还是一个2维阵。于是，OOC很方便构成类似RF无线通信中的MIMO系统，可以实现光通信的空间分集、空间复用。当然，如果要实现空间复用，发端得采用多个光源（如LED）发送信号。不过，图像传感器PD阵列的“阵元”（像素）可多达1000万以上，怎样把空间分辨率这么高的阵列充分利用好，可能不是太容易的事，也许，用“子阵”的办法是一条途径？OCC的问题OCC的麻烦事是它的通信速率不高，因为常用图像传感器的帧速率为30 fps，不足以实现高数据速率通信。而且，根据奈奎斯特采样定理，如果用LED灯的闪烁来发射信号的话，它的闪烁频率不能高于15Hz，我们的眼睛受不了啦。如果假设汽车的行驶速度是10m/s（36公里/小时），走了10m才能收到15bit的数据，这个似乎没法接受。所以，OCC呼唤高帧率（HFR，High Frame Rate）图像传感器。实际上，这不只是OCC的事，对实时HFR图像处理的需求还有不少行业，例如，机器人，工厂自动化，多媒体和生物医学等。毋庸置疑，用于汽车应用的VLC需要HFR图像处理技术，这个问题在文献[4]讨论比较详细。OCC可能的应用虽然现在的硬件还有些不满足需求高的场合，但别小看了OCC，它可能前途无量。OCC应用场景, 来自参考文献[2]: OCC应用于V2I 和V2V，来自参考文献[4]:V2I-VLC系统，来自参考文献[4]:自由空间光通信（FSOC）Free Space Optical Communication (FSOC)，直译就是“自由空间光通信”,其实主要是指“自由”激光通信，在大气中传输的激光通信。当然，也有的干脆把FSO和OWC等同起来，例如“Free Space Optical (FSO) communication, also known as Optical Wireless Communication (OWC)”[5]。在文献[5]中，专门对FSO的分类问题进行了研究。不过，我们在这里还是偏向传统的说法，把FSO归入OWC，即指陆地和空间的“自由空间光通信”。既然是大气中的激光通信，FSO可以提供超远距离（例如超过10000公里）的通信，当然也可近距离通信。无论远近，它的带宽很宽，数据传输率非常高。在OWC中，FSO应该是比较早的，自然也就比OOC这些要成熟得多。因此这里也就不再赘述，看看它们的应用吧。值得留意的是，FSO通信的超远距离可达10,000km，超短距离可以小到芯片间的通信。上面FSO应用图示，均来自文献[2]。最后比较一下FSO通信与微波通信，见下表。FSO通信与微波通信的比较[2]水下光通信（UOWC）UOWC：Underwater Optical Wireless Communication，水下光无线通信。谁都知道水下通信用声学，干嘛还要用光呢？水声通信——最成熟但不完美水下声学通信，英文叫“underwater acoustic communication”，就是大家说的水声通信，历史悠久，技术成熟，应用广泛。水声通信最具吸引力的优势是它的通信距离，可达几十公里。在水里的信号要传几十公里并非易事。首先，由于频率底，带宽就不会宽，所有声学链路的传输数据速率比较低，通常为kbps的量级。其次，由于声波在水中传播速度慢（20摄氏度纯水约为1500米/秒），声链路存在严重的通信延迟，通常长到以秒为单位。还有，声音收发器通常体积大，成本高，能耗也高，对于那种大规模水下无线传感网络来说，显然不经济。另外，有意思的是，海洋里面还有些生物就是用声波来“通信”和“导航”的，我们的声学通信，可能会打搅它们呢。水下RF——频率低又传不远水下射频（RF）通信就是地面射频通信的延伸，它的优点：首先是“空-水跨界”平稳，就是与声波和光波相比，它在“空-水”接口界面传输比较平稳，这个利于水下水上的顺畅，便于实现地面射频通信系统与水下射频通信系统的跨界通信。其次，射频方法对水湍流和浑浊度的耐受性更强。当然，实际是长波、超长波，通信很稳定，也不受啥干扰。水下射频方法的缺陷是可使用的频率低，通信距离又不远。海水含有大量盐，射频波只能在超低频（30-300Hz）下传播几米，做得好的话也就20米。此外，频率那么低，显然需要很大的天线，发射天线长到以百米计，想想这种天线要放到潜艇下是一个啥感觉？水下RF信号的发射是个麻烦事。潜艇要发射远距离RF通信，比如短波，就要上浮到把天线伸出水面，赶快把信号发射完，然后又下沉。现在说说UOWC与声学和RF相比，水下光无线通信UOWC的数据传输速率很高，链路延迟不长，成本也低。 UOWC可以在数十米的中等距离内实现Gbps数据速率，当然就可以传输水下视频啦。由于光在水中的传输速度远高于声波，因此UOWC链路延迟就比声链路小到可以忽略不计。与声学和射频方法相比，UOWC还具有更高的通信安全性。UOWC比其声学和射频对应产品更节能、更具成本效益。由于不用大型、昂贵、能耗高的声学或射频收发器，而是用激光二极管和光电二极管这样的水下光收发器，UOWC系统的成本低、体积小，有利于大规模商业化，像水下无线传感器网络，很适合用UOWC。当然，不是说有了UOWC就不用声学通信和射频通信了，三者其实是共存，各有各的优势，各有各的应用场景。一种UOWC系统的构成，来自参考文献[8]：下面看看UOWC的信道图示和场景。UOWC的4种信道，来自文献[8]：与陆地和空中连接的水下无线传感器网络，来自文献[8]：RFC+OWC，从5G到6G？无线通信，Where to go？很多人都说，光无线通信OWC支持高速数据传输，适合物联网大规模连接，是很有前途的技术。 5G及5G后的通信，必然具备超密集异构网络的必要功能，而VLC，LiFi和OCC可以提供超密集的小小区热点服务。此外，FSO，LiFi和VLC可以有效地为5G及5G后的通信系统提供高容量回程支持。无论怎样，有一点是肯定的，那就是，那些还没有被通信利用的“光谱”，一定会被利用起来。频谱非再生，放着那么宽的光波段不用，非要都挤在RF？所以，未来必然是RFC+OWC，也就是“无线电+无线光”，这是满足需求日益增长的必由之路。“全景”无线通信“无线电通信+无线光通信”，构成了无线通信的“全景”。各自都有各自的优势，也有各种的缺陷，多种需求，多种应用，“互补”就是自然的了。这样的“全景”可以用文献[1]的一个图来示意，我们把图中的OWC部分翻译成了中文，RF无线通信部分就不必说了:无线通信的“全景”，涵盖了包括太赫兹频段在内的RF频谱，以及包括红外线、可见光和紫外线的光谱。它们的简要归纳见下表:无线电通信和无线光通信OWC之未来研发异构混合网络把两种或两种以上的不同通信技术集合运用，构成如OWC/RF、FSO/RF、WiFi/LiFi、VLC/Femtocell、VLC/FSO和LiFi/OCC等等这样的网络。混合网络可以在负载平衡、链路可靠性、远程可连接（如深空、深海）和减少干扰方面发挥重要作用。这种异构混合网络的麻烦事，就是“切换”问题，如何自适应地、平稳地从一个系统切换到另一个系统，是一个不小的挑战。在OWC中的水平切换，例如在LiFi网络之间的切换；更重要的，垂直切换，例如，在LiFi和WiFi网络之间的切换；这些还待逐步研究。光回程对于5G、B5G/6G，大容量回程连接非常重要，光无线网络，如FSO或VLC，是一个有前途的研究课题。NLOS 紫外光通信 UV波段的一个重要特征，就是可以实现NLOS条件下的高速率传输，这是UV的一个重要优势，但如何发挥好这个优势，还有很多问题值得研究。小区间的光干扰不同小区之间的LED，如果有重叠照射区域，就会产生干扰问题。对于VLC/LiFi 小小区，密集部署LED，干扰管理不得不解决。水下光通信水下通信的距离问题和数据传输速率问题是两个老大难问题。405nm蓝光激光器的应用有望成为远程水下通信的一个重要研究课题。当然，设计适合水下环境特点的调制和编码技术，也还是一个重要的研究方向。无缝移动性很多时候，OWC系统也需要支持用户移动，但目前只有LiFi提供无缝连接。与无线电相比，无线光的无缝移动性更麻烦。MIMO光无线通信虽然MIMO在RF的通信系统中已经比较成熟，但在OWC中应用MIMO还具有挑战性。MIMO OWC意味着LED阵列、PD阵列、LD阵列，等，由于MIMO带来的复杂性和无线光信道的特殊性，充满了挑战。OCC的速率OCC系统的数据传输速率不高，目前只能达到几十Mbps，这显然不能满足高速数据的需求。基于红、绿和蓝色（RGB）LED的OCC，使用RGB LED发射，彩色相机（图像传感）接收，可以实现并行可见光通信通信，很诱人，不少研究人员正在进行这种研究。调光控制设计调光算法，有效部署OWC系统。避免人感觉闪烁光信号调制，不应该引起人们感觉到闪烁。而在低速率的类似OOK这样的系统，容易导致这种情况。避免让人感到光的闪烁，是部署OWC系统必须要考虑的一个问题。参考文献(略)文件大小不能超过5M，有兴趣者可在“临菲信息技术港”下载PDF完整文档，或关注公众号“lynchpin2012”阅读全文.编辑于 2019-05-29 22:54无线通信光通信5G通信赞同 862 条评论分享喜欢收藏申请

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请问operating working capital, working capital, net working capital分别如何定义，如何使用？ - 知乎

请问operating working capital, working capital, net working capital分别如何定义，如何使用？ - 知乎首页知乎知学堂发现等你来答切换模式登录/注册会计财务管理公司金融学请问operating working capital, working capital, net working capital分别如何定义，如何使用？关注者10被浏览23,709关注问题写回答邀请回答好问题添加评论分享2 个回答默认排序Donald工程师关注Net working Capital 指的是净运营资本，而净运营资本＝增加的流动资产－增加的流动负债；working capital指的是流动资本，而流动资本=增加的流动资产，因此两者是不一样的，net debt/cash在投资分析中的作用主要指的是净现金流量的作用，净现金流量又称现金净流量，是指在项目计算期由每年现金流入量与同年现金流出量之间的差额所形成的序列指标，它是计算项目投资决策评价指标的重要依据。

某年净现金流量=该年现金流入量-该年现金流出量

http://www.wisegeek.com/what-is-operating-working-capital.htm#didyouknowout

Operating working capital (OWC) is a financial metric designed to accurately determine a company's liquidity and solvency. It is similar to the basic concept of working capital in that it is calculated by subtracting a company's liabilities from its assets, but it more narrowly defines what constitutes those assets and liabilities. In terms of OWC assets are limited to inventory and accounts receivable, while liabilities are limited to accounts payable. By narrowing the scope to these basic elements, it prevents anything but the company's operational success or lack thereof from clouding the financial picture.

When using the simple concept of working capital, the assets portion of the equation includes cash and securities, while the liabilities may include any debt a company has accrued. Yet these numbers are more a reflection of a company's financing structure rather than a true measure of its operational efficiency or day-to-day business strength. As a result, financial experts may rely on the concept of operating working capital as being more indicative of how well a company is doing business or how it stacks up against another in terms of investment opportunities.

发布于 2016-05-13 10:55赞同 7添加评论分享收藏喜欢收起知乎用户operating working capital,OWC 经营营运资本是管理用资产负债表的科目。OWC=经营性流动资产-经营性流动负债（这三个概念都是管理用资产负债表的。管理用资产负债表不同于传统的资产负债表，传统的分投资活动筹资活动和经营活动，管理用的只区分金融活动和经营活动）经营性流动资产：流动资产中没有利息收入的部分，比如货币资金，应收账款，应收票据经营性流动负债：流动负债中没有利息的部分，比如应付票据，应付账款，其他应付款working capital,WC 营运资本就是流动资产-流动负债，也可以理解为长期资本用于流动资产的金额。net working capital 还没学到编辑于 2021-08-15 16:35赞同 4添加评论分享收藏喜欢收起

外设公司OWC推出采用USB4协议的M.2硬盘盒速度可达3151MB/S - 蓝点网

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外设公司OWC推出采用USB4协议的M.2硬盘盒速度可达3151MB/S

2023年12月7日 23:14硬件设备, 科技资讯

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5.86K1

专注于 USB 和 Thunderbolt 的外设公司 OWC 今天推出了该公司首款基于 USB4 协议的 M.2 SSD 硬盘盒 OWC Express 1M2，得益于使用采用 USB4 协议，OWC 承诺该硬盘盒可以提供 3151MB/S 的读取速度。

OWC Express 1M2 的最大特点就是采用 USB4，当然还有些辅助工作，那就是整个硬盘盒就是个散热鳍片，因为要提供超高的读写速度 SSD 的发热量、硬盘盒芯片组的发热量都是不得了的，所以必须加强散热。

这样可以确保在长时间高速读写时 SSD 也能维持在一个相对比较稳定的温度，避免温度过高出现问题。

要使用 OWC Express 1M2 对用户来说也有一些辅助工作，首先这是一个硬盘盒不带硬盘，你需要自行购买一块 M.2 2230/2242/2280 的 SSD；其次你需要确保你的主机支持 USB4 或者 Thunderbolt 4 协议，这样才可以获得更高的传输速度。

当然如果你能接受更低的速度也可以使用常规的 USB 协议，比如传统的 USB 3.0 协议。

该硬盘盒兼容 Windows 和 Mac 用户，对于 Mac 用户来说机身自带的存储空间可能比较小，使用 OWC Express 1M2 进行扩展的话比较方便，毕竟速度足够快，而且近几年的 Mac 都支持 Thunderbolt 协议，即便不是 4 速度也还不错。

最后该硬盘盒最大支持 8TB 的 SSD，目前消费级产品里 M.2 SSD 最大似乎就是 8TB 了吧？应该足够用户使用了。

最后的最后是价格：119.99 美元，约合人民币 860 元，已经可以购买一块 2TB 的 M.2 SSD。

相关文章换一批消费者请注意！分析师预计本季度SSD价格还将下跌最高降幅13%2023年7月10日 17:055.30K3戴尔和惠普企业再次发布固件修复硬盘运行四万小时后掉盘丢数据问题2020年3月29日 14:422.79W1最快读写240MB/S、这只是MicroSD卡2014年4月17日 14:531.55W4三星推出860 QVO系列固态硬盘 QLC颗粒最大容量4TB2018年11月29日 04:062.98W2ADATA威刚推出读写速度550/510MB每秒的SP550系列SSD 售价269元起2015年12月28日 15:595.46W23微软解释Surface为什么一直没有搭载Thunderbolt接口以及为何焊死内存2020年4月25日 22:355.70W12三星推出960 EVO/PRO 固态硬盘读取速度高达3,500MB/s2016年9月21日 21:253.81W12西部数据发布首款消费级固态硬盘读写速度约500MB/s2016年10月12日 18:271.72W0有用户发现Windows 11 NVMe固态盘性能显著下降微软正在调查2021年12月7日 20:288.39K0容量高达15TB的三星PM1633a固态硬盘开始销售售价约合人民币68000元2016年7月29日 13:452.91W0

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无法检测到微软Office Web软件（OWC）是什么意思？ - 知乎

无法检测到微软Office Web软件（OWC）是什么意思？ - 知乎首页知乎知学堂发现等你来答切换模式登录/注册软件Office 2007Office 365无法检测到微软Office Web软件（OWC）是什么意思？关注者2被浏览10,688关注问题写回答邀请回答好问题添加评论分享1 个回答默认排序巴别鸟已认证账号关注微软已经停止了对OWC的支持，所以当用到OWC（一般是一些图表）时会弹出提示这个蛮抓狂的，因为组件库里根本找不到OWC往年的解决方案是到微软官网下载一个OWC安装包，安装后就可以正常使用了。但是～～～目前这个安装包已经过期了！！！！！！下面是我网上搜索的一些关于OWC的信息：Microsoft Office Web Components 是组件对象模型 (COM) 控件的集合，可用于将电子表格、图表和数据库发布到网站上。它们也可用来查看已发布的这些项目和数据访问页。如果安装有 Microsoft Office FrontPage 2003、Microsoft Office Access 2003 和 Microsoft Office Excel 2003，就可以使用 Office Web Components 将交互数据作为网页的一部分进行发布。使用 Microsoft Internet Explorer 5.01 或更高版本，Office Web Components 可用于查看在网页中发布的控件（电子表格、图表或数据库）以及数据访问页。2007里怎么找不到OWC12。据叶伟民先生的可靠消息，Office2007里面是没有OWC12的。这么优秀的组件就这样告终了。全称是Office Web Components，主要提供Spreadsheet,Chart,PivotTable?,and Data Source Control等组件。OWC能将部分Office的功能扩展到Web上，是一个优秀的服务器端图表引擎，具有与Excel同样强大的图表绘制能力。能够在服务器端动态生成GIF或JPG格式的图表。微软早有预谋要用Excel Services来替代OWC，所以不打算对OWC放太大的精力。Excel Services倒是比OWC好很多，不过一定要装SharePoint Server 2007 Enterprise。如果要在Office 2007中使用OWC，比如要在PPT上绘制数据透视图，就必须将Office 2003或者Office 2002的OWC组件OWC10.DLL或OWC11.DLL复制到您的电脑里，然后再进行注册，才能在Office 2007上使用发布于 2020-08-17 11:09赞同 2添加评论分享收藏喜欢收起

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ThunderBay Flex 8

Eight-Bay Thunderbolt (USB-C) Storage + Expansion Solution

The industry's first Thunderbolt 3 storage, docking, and PCIe expansion media workflow solution. Perfect for digital imaging, VFX, and video editing.

Flex 1U4

Four-Bay Rackmount Thunderbolt (USB-C) Storage, Docking & PCIe Expansion Solution

Go beyond the desktop with the most flexible storage, docking, and PCIe expansion solution for any rackmount use.

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Eight-Bay Thunderbolt (USB-C) Storage Solution

With up to 160TB at up to 2,586MB/s speeds, the ThunderBay 8 is like a personal data center for content creators and small business workgroups.

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We made the OWC ThunderBay 4 even better with all improved internals, performance, reliability, and flexibility.

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With four 2.5-inch drive bays, OWC ThunderBay 4 mini transforms your SSDs and HDDs into a pro-grade, Thunderbolt 3 storage solution in a compact design.

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With four 2.5-inch drive bays, ThunderBay 4 mini transforms SSDs and HDDs into a pro-grade, Thunderbolt 2 storage solution in a compact design.

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The fastest Thunderbolt shuttle and editing RAID SSD in the universe.

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Four M.2 SSD bays with pure adrenaline inducing Thunderbolt 3 performance.

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Four-Drive USB 3.2 (10Gb/s) Storage Solution

Mercury Elite Pro Quad is the ideal four-bay enclosure for content workflows where speed, capacity, performance, and flexibility are paramount.

Archive Pro

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Thunderbolt 3 LTO-8 archiving solution for M&E pros, corporations, government branches, and small businesses seeking to preserve critical data.

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Blazing-fast NVMe SSD performance meets massive capacity in this compact, dual-bay Thunderbolt storage solution. Perfect for backups and pro creative uses.

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The only drive you need to organize your digital life. Features dual drives and seven ports, taking you from notebook to workstation in seconds.

Mercury Elite Pro Dual

Dual-Drive Thunderbolt 2 + USB 3.2 (5Gb/s) Storage Solution

Mercury Elite Pro Dual is the best dual-drive hardware RAID solution for creative workflows and system backups.

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The digital desktop centerpiece for home offices, businesses, and creative pros with dual drive bays for up to 36TB of storage capacity.

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Mercury Elite Pro Dual features both high-speed USB 3.2 (5Gb/s) & eSATA ports to offer the connectivity, versatility, and extreme speeds.

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Dual-Drive USB 3.2 (10Gb/s) Bus-Powered Portable Storage Solution

The latest high-performance portable RAID from OWC. Packing dual-drive, USB 3.2 (10Gb/s) performance into a portable, bus-powered form factor.

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Designed to stack perfectly with the Mac mini and the ideal storage and connectivity expansion companion for Thunderbolt or USB-equipped computers.

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The OWC miniStack is the stackable, external hard drive solution designed to complement the look and feel of the latest Mac lineup.

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The universally compatible, portable SSD for Thunderbolt and USB devices. Offers performance of up to 2800MB/s in a crushproof and waterproof case.

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The super-fast, extremely rugged portable SSD with speeds up to 2847 MB/s for modern Thunderbolt and USB4 equipped computers.

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The world's first Thunderbolt certified, bus-powered, 'add your own drive' enclosure for NVMe SSDs. Supports up to 1553 MB/s real world performance.

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The fastest, toughest mini-sized SSD available. It’s crushproof, dust-proof and waterproof for transferring gigabytes of data in seconds.

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The ultimate 'works with everything' pocket-sized SSD with real-world performance up to 946MB/s and capacities up to 1.0TB.

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With up to 18TB capacity, Mercury Elite Pro offers the perfect blend of performance, reliability, and value in a desktop-sized external drive.

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Mercury Elite Pro is the workhorse project drive for creative professionals that delivers multiple ports for extended connectivity.

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Cost-effective, highest quality memory cards for most common photo and up to 4K video capture uses.

Atlas Ultra

CFexpress Type B Memory Cards

High-performance, highest quality memory cards for the most demanding video recording uses of professional filmmakers and continuous burst mode shooting by advanced photographers.

Atlas Pro

CFexpress Type B Memory Cards

Cost-effective, highest quality memory cards for the most demanding needs of professional photographers and the most common use cases of professional filmmakers.

Atlas CFexpress Card Reader

USB4 (40Gb/s) CFexpress 4.0 Type B Card Reader

Ultra-fast compact USB4 (40Gb/s) CFexpress 4.0 Type B card reader for creative professionals with transfer speeds up to 5000MB/s.

Atlas Dual CFexpress + SD Card Reader

USB 3.2 (10Gb/s) Dual-Slot CFexpress Type B and SDXC UHS-II Card Reader

Empower yourself with maximum workflow efficiency by ingesting CFexpress and SD memory cards simultaneously.

Atlas Dual SD Card Reader

USB 3.2 (10Gb/s) Dual-Slot SDXC UHS-II Card Reader

Compact bus-powered dual slot SD memory card reader that helps photographers, filmmakers, and content creators work smarter & more efficiently.

Atlas FXR

Thunderbolt (USB-C) + USB 3.2 (10Gb/s) CFexpress Card Reader

Easily transfer captured content from CFexpress Type-B cards, and take advantage of transfer speeds over 1600MB/s with Thunderbolt and up to 900MB/s with USB.

Atlas CFast Card Reader

USB 3.2 (10Gb/s) CFast 2.0 Card Reader

USB compatible CFast 2.0 card reader for DITs, photographers, videographers, and content creators.

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Apple-Specific Blade SSDs

OWC Aura Pro X2 SSDs

For most MacBook Pro, MacBook Air, Mac Pro, Mac mini, and iMac (2013 and Later)

Your Mac. More space. Twice as fast. Get up to 16x more storage and up to double the speed of the original drive!

SSD only up to 2.0TB from $94.99

Complete SSD Upgrade Solutions from $144.99

Including SSD, tools & transfer enclosure

Complete SSD Upgrade Solutions from $129.99

Including SSD, tools & external drive

OWC Aura N2 SSDs

For most MacBook Pro, MacBook Air, and Mac mini (2013 and Later)

Get the maximum return from your setup with Aura N2, an SSD upgrade that revives the storage and stamina of your Mac and keeps everything else the same.

SSD only up to 1.0TB from $57.99

Including SSD & tools

Complete SSD Upgrade Kits from $99.99

Including SSD, tools & transfer enclosure

Complete SSD Upgrade Kits from $109.99

Including SSD, tools & external drive

OWC Aura Pro NT SSDs

For 13-inch MacBook Pro non-Touch Bar (2016 - 2017)

Your Mac. More space. Twice as fast. Get up to 16x more storage and up to double the speed of the original drive!

Model ID: MacBookPro14,1; MacBookPro13,1

SSD Upgrade Kits up to 2.0TB from $59.99

Including SSD & tools

Complete SSD Upgrade Solutions from $114.99

Including SSD, tools & external drive

OWC Aura Pro 6G SSDs

For MacBook Pro with Retina (Mid 2012 - Early 2013)

Your Mac. More space. Twice as fast. Get up to 16x more storage and up to double the speed of the original drive!

Model ID: MacBookPro10,1; MacBookPro10,2

SSD only up to 2.0TB from $39.99

Complete SSD Upgrade Solutions from $69.99

Including SSD, tools& transfer enclosure

OWC Aura Pro 6G SSDs

For MacBook Air (2010-2012)

Professional grade SSDs that deliver even higher performance for audio & video production, photography, and more.

OWC Aura Pro 6G SSDs

For MacBook Air (2012)

Model ID: MacBookAir5,2; MacBookAir5,1

SSD only up to 1.0TB from $39.99

Complete SSD Upgrade Solutions from $85.99Including SSD, tools & transfer enclosure

OWC Aura Pro 6G SSDs

For MacBook Air (2010-2011)

Model ID: MacBookAir4,2; MacBookAir4,1; MacBookAir3,2; MacBookAir3,1

SSD only up to 1.0TB from $57.99

Complete SSD Upgrade Solutions from $59.99Including SSD, tools & transfer enclosure

OWC Aura 6G SSDs

for 27-inch iMac (Late 2012)

Upgrading your iMac with an OWC SSD is the performance pathway to a total system boost with Aura 6G for iMac. OWC provides Mac users with a complete upgrade solution that delivers higher performance and reliability.

Model ID: iMac13,2

Up to 2.0TB from $39.99

2.5-inch SATA SSDs

OWC Mercury Enterprise Pro 6G SSDs

The capacity giant that crushes all other SATA SSDs, delivering performance and reliability for demanding environments.

Up to 16.0TB from $1,199.99

OWC Mercury Extreme Pro 6G & Mercury Electra 6G SSDs

Experience the ultimate performance upgrade for any 2.5-inch SATA 6G Mac, PC, laptop, desktop, or server!

Up to 4.0TB from $22.99

"Editors Choice without a second thought! Great job OWC!"

– Les Tokar, The SSD Review.com

"The OWC 6G SSD is the fastest SSD we have tested to date..."

– Rob-Art Morgan, BareFeats.com

OWC Mercury Electra 3G SSDs

High-performance 2.5-inch SATA 3G SSD for demanding portable and desktop/tower users.

Up to 2.0TB from $22.79

"The most amazing upgrade I ever did..."

– John Gruber, Daring Fireball

"Class leading in many real world tests... price is lower than most on the market... the OWC Mercury is at the top of our list."

– TweakTown

"Offers eye-popping speed, as well as the peace of mind of consistent performance over time..."

– James Galbraith, Macworld

NVMe U.2 SSDs

OWC U2 Shuttle

The world's first U.2 carrier shuttle for up to four NVMe M.2 SSDs

Combine up to four NVMe M.2 SSDs in to a swappable, high-capacity RAID ready storage solution for 3.5-inch U.2 drive bays.

Up to 32.0TB from $449.99

Build your own ultra-fast RAID ready swappable U.2 SSD storage solution with up to 4 x NVMe M.2 SSDs!

DIY Enclosure only $129.99

OWC U2 ShuttleOne Premium heat-dissipating adapter that converts an NVMe M.2 SSD into a swappable U.2 SSD

The OWC U2 ShuttleOne brings U.2 SSD performance and capacity to the mainstream with a flexible, easy to use “build your own” heat dissipating full metal adapter.

Up to 8.0TB from $114.99

Build your own ultra-fast swappable U.2 SSD storage solution!

DIY Enclosure only $39.99

NVMe M.2 SSDs

OWC Aura Ultra IV SSDs

The fastest NVMe M.2 SSD Solution for computers and external drives.

Strap in and hold on tight as the Aura Ultra IV launches you into an entirely new world of drive performance. This high performance PCIe 4.0 M.2 SSD delivers 2X faster data transfer rate of PCIe 3.0 SSDs, which lets you experience the full potential of NVMe drive technology up to real-world speeds of 7415MB/s!

Up to 4.0TB from $79.99

OWC Aura Ultra III SSDs

Raise your game with NVMe M.2 performance!

A powerful M.2 SSD using NVMe technology designed for flash memory, Aura Ultra III provides a perfectly optimized blend of speed and reliability.

Up to 4.0TB from $79.99

PCIe SSDs

OWC Accelsior 8M2

OWC Beyond Fast™ – The Fastest, Highest Capacity PCIe SSD in the Galaxy.

This ultra high-performance 8-drive PCIe NVMe M.2 SSD solution provides mind-blowing performance – up to 12,000MB/s on today's PCIe Gen 3 Mac and PC desktops, and over 26,000MB/s with PCIe Gen 4-capable computers!

Up to 64.0TB from $1,499.99

Build your own PCIe RAID-ready SSD storage solution – add up to 8 x NVMe M.2 SSDs!

PCIe Expansion Card only $979.99

OWC Accelsior 4M2

Work faster than ever with over 6,000MB/s real world speed!

The ultimate performance drive for Mac Pro (2019), Mac Pro (2010 - 2012), and PC towers. Installs into a full-height, half-length x8 or x16 PCIe 3.0 or 2.0 slot.

Up to 32.0TB from $579.99

Build your own PCIe RAID-ready SSD storage solution – add up to 4 x NVMe M.2 SSDs!

PCIe Expansion Card only $279.00

OWC Accelsior 1M2

High-performance PCIe NVMe SSD solution with speeds up to 3400MB/s!

Utilize an open PCIe slot in your Mac Pro (2019), Mac Pro (2010 - 2012), or PC tower to deliver the thrilling speed advantage of an NVMe PCIe SSD.

Up to 4.0TB from $74.99

Build your own PCIe M.2 SSD storage solution – add your own NVMe M.2 SSD!

PCIe Adapter Card only $24.99

OWC Accelsior 1A

PCIe Adapter Card for Apple and OWC Aura SSDs.

Access most late 2013 to current Apple factory SSD or OWC Aura PCIe SSD to recover, migrate, and store data.

Build your own PCIe SSD storage solution – add your own Apple or OWC blade SSD!

PCIe Adapter Card only $27.99

OWC Mercury Accelsior S

Add easily upgradeable 2.5-inch SSD storage to an open PCIe slot!

Add a 2.5-inch SATA 6G drive to your Mac or PC for faster startup and quick response times with over 500MB/s sustained data rates.

Up to 4.0TB from $51.00

Build your own PCIe SSD storage solution – add your own 2.5-inch SSD!PCIe Adapter Card only$26.99

IDE/ATA SSDs

OWC Mercury Pro Legacy SSDs 3.5-inch IDE/ATA SSD Internal Drive Kit for IDE/ATA Desktops

Add a technological supercharger to your existing Mac or PC with the OWC Mercury Pro Legacy 3.5" IDE/ATA SSD Internal Drive Kit. With no internal moving parts to slow down your data transfers, and thanks to the included special PATA adapter, it's the most reliable IDE/ATA solution available for breathing lightning fast performance into that trusty machine and extending its usefulness.

Up to 500GB from $51.79

There's an OWC SSD for almost any Mac or PC from the last decade.

Aura, Mercury Electra, Mercury Enterprise, and Mercury Extreme are trademarks of New Concepts Development Corporation, registered in the U.S. Patent and Trademark Office. Mercury Legacy is a trademark of New Concepts Development Corporation. Apple, Mac, MacBook Air, MacBook Pro and Retina are trademarks of Apple Inc., registered in the U.S. and other countries. SandForce Driven is a trademark of LSI Corporation in the U.S. and/or other countries. Other marks may be the trademark or registered trademark property of their owners.

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Mercury Extreme Pro 6G

2.5-inch SATA 6Gb/s SSD

The first choice for pros who need maximum speeds, capable of achieving incompressible data speeds up to 479MB/s.

Mercury Electra 6G

2.5-inch SATA 6Gb/s SSD

Whether adding a 2.5" SSD to your system or replacing a factory SSD or hard drive, Mercury Electra 6G delivers superior speed and reliability.

Mercury Electra 3G

2.5-inch SATA 3Gb/s SSD

The clear choice for a performance and capacity boost far beyond your Mac's factory limitations. Available up to 2.0TB, and capable of speeds over 285MB/s.

Accelsior 8M2

Eight-Drive NVMe M.2 SSD PCIe 4.0 Storage Solution

World’s Fastest and Highest Capacity PCIe SSD

Accelsior 4M2

Four-Drive NVMe M.2 SSD PCIe 3.0 Storage Solution

Work faster than ever with over 6,000MB/s real world speed!

Accelsior 1M2

NVMe M.2 SSD PCIe 4.0 Storage Solution

Lets performance upgraders, system builders, and server admins add their choice of PCIe M.2 SSD to create a speed boosting, capacity expanding solution.

Accelsior 1A

Apple Factory SSD to PCIe Expansion Card

Repurpose an Apple factory flash drive from most 2013 to 2019 Mac models into a high-performance PCIe SSD.

Accelsior S

2.5-inch SATA 6G SSD to PCIe Expansion Card

The Accelsior S dual-lane PCIe 2.0 card delivers flexible storage expansion to your silver Mac Pro tower or PC with more than 500 MB/s of throughput.

Accelsior M

mSATA SSD to PCIeExpansion Card

The first driverless cross platform PCIe to mSATA SSD solution that lets you install the mSATA SSD of your choice for near instant startup and app launching.

Aura Pro X2

Gives you 16x more storage (up to 2TB) and up to double the speed of the original drive so you can keep your Mac running optimally for years.

Aura N2

Upgrade your Mac up to 1TB of storage with read speeds up to 1600MB/s and write speeds up to 1100MB/s - all for the fraction of the cost of a new model.

Aura Pro NT

Upgrade the internal storage of your 13-inch 2016-2017 MacBook Pro (non-Touch Bar) up to 16x the space as the original Apple factory drive.

Aura Ultra IV

PCIe 4.0 NVMe M.2 2280 SSD

The fastest PCIe 4.0 NVMe M.2 SSD solution for computers and external drives.

Aura Ultra III

PCIe 3.0 NVMe M.2 2280 SSD

Gear up your system for media projects and gaming with the advanced M.2 NVMe technology. Read speeds up to 3,400MB/s and write speeds up to 3,000MB/s.

Aura Pro III

PCIe 3.0 NVMe M.2 2242 SSD

The fastest NVMe M.2 SSD solution for ultrabooks, notebooks, AIO computers, Chromebooks, mini PCs, and external drives.

U2 Shuttle

Four-Slot NVMe M.2 to U.2 Carrier Shuttle

World’s first U.2 carrier shuttle for 3.5-inch drive bays that combines up to four NVMe M.2 SSDs into a swappable, RAID-ready storage solution.

U2 ShuttleOne

NVMe M.2 to 2.5-inch U.2 SSD Adapter

Utilize readily available and affordable NVMe M.2 “blade” style SSDs in a 2.5-inch U.2 Bay and access a new world of storage possibilities.

Atlas Ultra

SDXC UHS-II V90 Memory Cards

High-performance, highest quality memory cards for advanced photography and video recording at maximum camera settings.

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Cost-effective, highest quality memory cards for most common photo and up to 4K video capture uses.

Atlas Ultra

CFexpress Type B Memory Cards

High-performance, highest quality memory cards for the most demanding video recording uses of professional filmmakers and continuous burst mode shooting by advanced photographers.

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CFexpress Type B Memory Cards

Cost-effective, highest quality memory cards for the most demanding needs of professional photographers and the most common use cases of professional filmmakers.

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Pro-Level Storage Solutions

OWC ThunderBay External RAID Arrays

Offering up to 172TB of capacity and performance speeds of up to 2750MB/s, the OWC ThunderBay lineup gives you game-changing performance, scalable and gigantic capacity options, with time-tested reliability built upon the most robust RAID engine on the planet.

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Mega-Capacity, Reliability & Performance

Atlas Memory Cards & Readers

Go from Capture to Completion™

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OWC Atlas Dual CFexpress + SD Card Reader

Ready for wherever work or play takes you.

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OWC 14-Port Thunderbolt Dock

Quickly access all of the displays and peripherals at your desk while minimizing desk clutter. Charge your computer and all of your mobile devices simultaneously. Connect storage, devices, media cards and more, to make any workspace feel like home.

Only $99.99

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Portable SSDs

Pure performance that fits in the palm of your hand. Experience lightning-fast speeds, compact designs, and ample storage wherever you go. Built for durability and universal connectivity for the perfect blend of speed, reliability, and convenience.

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Envoy Pro FX

Up to 2800MB/s, dust/drop/waterproof & universally compatible with any Thunderbolt or USB port.

480GB - 4TB from $169.99

Envoy Express

The world’s first Thunderbolt certified bus-powered DIY enclosure delivering up to 1553MB/s speeds.

Enclosure - 8TB from $79.99

Envoy Pro Elektron

Our smallest crushproof/dustproof/waterproof USB-C or USB-A solution offering up to 1100MB/s.

240GB - 2TB from $98.99

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Mercury Elite Pro Mini

Bus-powered USB drive engineered to keep pace with you, from studio to office.

Enclosure - 4TB from $39.99

Envoy Pro Mini

The ultimate 'works with everything' pocket-sized all aluminum SSD delivering up to 946MB/s.

250GB - 1TB from $64.99

Mercury On-The-Go Pro

Transparent, shock-resistant, compact fanless HDD or SSD solution that weighs less than 11oz.

Enclosure - 4TB from $47.99

From This Week's Newsletter

OWC Mercury Elite Pro

USB 3 / 7200RPM HDD

Your choice of capacity at huge savings. The optimal balance of performance and reliability for your desktop data storage needs.

Up to 283MB/s real-world speed

Perfect for Mac, Windows, Linux, PS4, Xbox consoles, and smart TVs

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OWC 新款便携固态硬盘，大容量高速度_固态硬盘_什么值得买

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OWC 新款便携固态硬盘，大容量高速度

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据 TechPowerUp 消息， OWC 推出了 Envoy Pro FX 移动，雷电接口，4TB 大容量。官方称，这款移动 SSD 可通过 Thunderbolt 实现高达 2800 MB/s 的出色性能，兼容 Mac、Windows、Linux、iPad Pro、Chromebook 设备。OWC Envoy Pro FX 这款 SSD 具有快速、坚固、无需 AC 适配器的特点，适合摄影、视频编辑和文档存储备份等需求。OWC Envoy Pro FX 外观时尚，配有散热铝制外壳，防护等级为 IP67，经过 MIL-STD810G 认证，非常坚固耐用，实现军用级跌落保护。公司将其描述为“Virtually indestructible”（几乎坚不可摧）OWC Envoy Pro FX 4TB 版售价 899 美元（约 6077.24 元人民币）。未经授权，不得转载

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