计算机：

bit：比特
byte：拜特（字节）
k：千
1字节＝8比特

KB：千字节
Kb：千比特
MB：兆字节
Mb：兆比特
GB：千兆字节
Gb：千兆比特
TB：。。。
Tb：。。。

1TB=1024G
已经是相当大的容量了

目前好像最大的单位是EB
1EB=1024PB
1PB=1024TB
1TB=1024GB
1GB=1024MB
1MB=1024KB
1KB=1024B

但是：EB还不是最大的```最大的是牛b ( NB )
 

首先，新建个文本文件，输入下面这些：（直接复制到记事本就行）

ON ERROR RESUME NEXT

Dim VOL_PROD_KEY
if Wscript.arguments.count<1 then
VOL_PROD_KEY=InputBox("Powered By www.cnbeta.com"&vbCr&vbCr&" 本程序将自动替换你当前 Windows 的序列号,通过微软验证完全正版。"&vbCr&vbCr&"序列号(OEM版无效,默认版本为 XP VLK)：","Windows XP序列号自动更换器","MRX3F-47B9T-2487J-KWKMF-RPWBY")
if VOL_PROD_KEY="" then
Wscript.quit
end if
else
VOL_PROD_KEY = Wscript.arguments.Item(0)
end if

VOL_PROD_KEY = Replace(VOL_PROD_KEY,"-","") 'remove hyphens if any

for each Obj in GetObject("winmgmts:{impersonationLevel=impersonate}").InstancesOf ("win32_WindowsProductActivation")

result = Obj.SetProductKey (VOL_PROD_KEY)

if err = 0 then
Wscript.echo "OK！去微软验证吧！"
end if

if err <> 0 then
Wscript.echo "替换失败！输入的 CD-KEY 与当前的版本不匹配。"
Err.Clear
end if

Next

然后将以上文本保存为key.vbs 双击执行即可 通过XP验证顺利安装 windows media player 11

Content Delivery Network (CDN) is a term coined in the late 1990s to describe a system of computers networked together across the Internet that cooperate transparently to deliver content (especially large media content) to end users. The first web content based CDN's were Sandpiper and Skycache followed by Akamai and Digital Island. The first video based CDN was iBEAM Broadcasting [citation needed].
CDN nodes are deployed in multiple locations, often over multiple backbones. These nodes cooperate with each other to satisfy requests for content by end users, transparently moving content behind the scenes to optimize the delivery process. Optimization can take the form of reducing bandwidth costs, improving end-user performance, or both.
The number of nodes and servers making up a CDN varies, depending on the architecture, some reaching thousands of nodes with tens of thousands of servers.
Requests for content are intelligently directed to nodes that are optimal in some way. When optimizing for performance, locations that can serve content quickly to the user may be chosen. This may be measured by choosing locations that are the fewest hops or fewest number of network seconds away from the requestor, so as to optimize delivery across local networks. When optimizing for cost, locations that are less expensive to serve from may be chosen instead. Often these two goals tend to align, as servers that are close to the end user sometimes have an advantage in serving costs, perhaps because they are located within the same network as the end user.

Co DeeN [132.239.17.225: 3128]

CoDeeN is an academic testbed Content Distribution Network (CDN) built on top of PlanetLab by the Network Systems Group at Princeton University. This testbed CDN consists of a network of high-performance proxy servers. Currently, proxy servers have been deployed on many PlanetLab nodes. These proxy servers behave both as  request redirectors  and server surrogates. They cooperate with each other and collectively provide a fast and robust web content delivery service to CoDeeN  users. A number of projects are related to CoDeeN, including the following:

    * CoBlitz, a scalable Web-based distribution service for large files.
    * CoDeploy, an efficient synchronization tool for PlanetLab slices.
    * CoDNS, a fast and reliable name lookup service.
    * CoTop, a command-line activity monitoring tool for PlanetLab.
    * CoMon, a Web-based general node/slice monitor that monitors most PlanetLab nodes.
    * CoTest, a login debugging tool that tries to be human-friendly.
    * CoViz, a visualization tool graphically displaying PlanetLab activity.

3G

Defination - 

3G refers to the third generation of developments in wireless technology, especially mobile communications. The third generation, as its name suggests, follows the first generation (1G) and second generation (2G) in wireless communications.

1G
The 1G period began in the late 1970s and lasted through the 1980s. These systems featured the first true mobile phone systems, known at first as "cellular mobile radio telephone." These networks used analog voice signaling, and were little more sophisticated than the repeater networks used by amateur radio operators.

2G
The 2G phase began in the 1990s and much of this technology is still in use. The 2G cell phone features digital voice encoding. Examples include CDMA and GSM. Since its inception, 2G technology has steadily improved, with increased bandwidth, packet routing, and the introduction of multimedia.

3G includes capabilities and features such as:

• Enhanced multimedia (voice, data, video, and remote control).
• Usability on all popular modes (cellular telephone, e-mail, paging, fax, videoconferencing, and Web browsing).
• Broad bandwidth and high speed (upwards of 2 Mbps).
• Roaming capability throughout Europe, Japan, and North America.

While 3G is generally considered applicable mainly to mobile wireless, it is also relevant to fixed wireless and portable wireless. A 3G system should be operational from any location on, or over, the earth's surface, including use in homes, businesses, government offices, medical establishments, the military, personal and commercial land vehicles, private and commercial watercraft and marine craft, private and commercial aircraft (except where passenger use restrictions apply), portable (pedestrians, hikers, cyclists, campers), and space stations and spacecraft.

3G offers the potential to keep people connected at all times and in all places. Researchers, engineers, and marketers are faced with the challenge of accurately predicting how much technology consumers will actually be willing to pay for. Another challenge faced by 3G services is competition from other high-speed wireless technologies, especially mobile WiMAX, and ability to roam between different kinds of wireless networks.

The current status of mobile wireless communications, as of July 2007, is a mix of 2nd and 3rd generation technologies.

Resources: