Qiankun smile [smileonce] smileonce@126.com 2004-7-23 All rights reprinted, please indicate http://blog.9cbs.net/smileOnce
In the Windows platform, we started using the virtual disc image, earliest is used to play games, there are some CD-Key disc mirrors, and use virtual optical drives to use. (There are also some tricks such as pull-driven data lines, I believe everyone also knows ^ _ ^) What we have to solve today is: How can you make sure you downloaded the CD image is correct (no damage or loss of data) ?
Common disc mirrors include Standard ISO Images (*. ISO), Cue Sheets (*. CUE), BLINDREED IMAGES (*. BWT), Discjuggler Image (*. CDI), Clonecd Image (*. CCD), Media Discriptor Files * .mds), Instant CD / DVD Images (*. PDI), Nero images (*. NRG), BlindWrite 5 images (*. b5t), when downloading these mirrored downloads, you will be included with MD5 file, or Passed the mirror MD5 code directly on the page, such as C9CA114C2E551ED8F7271549F37B423E XXX_XXX_ABC.ISO
How did this code calculate? This is the application of the MD5 encryption algorithm, and the data of the entire disc passes a series of calculations, and has drawn a 32-bit hexadecimal number (128 bit). This code is unique to indicate the information of this disc. Since the original information is as a slight change, after the MD5 operation, the results will have a big change, so it is widely used in the test of the Download CD.
Suppose we have downloaded the disc image XXX_XXX_ABC.ISO to C: / ABC, then MD5SUM (a tool for CD data operation MD5 algorithm, click here to download) is also copy to C: / ABC, then use "MD5sum
