Quote Originally Posted by System
how do i look at it? i downloaded it off a site not a mirror
Looks like the wiki and the downloading faq are unavailable at the moment. There are many md5 programs that will check it. The one I like is available here: http://sourceforge.net/projects/md5summer/

Basically your computer calculates the md5 sum of the file that you have and then it is compared to the md5 file that you can get from the site that you downloaded the iso from. If they match then your file is good; if they don't then your file is corrupt. The comparison can be done automatically by a program like md5summer, or you can just look at the md5 file (it's a text file) and manually check it against the sum you generate for your iso.