You will probably find that your CD ROM drive is not very good at reading CDRs, When you install depending on the options you select, not all the CD will be read as not all the CDs contents will be required. The media check is much more stringent in that it reads every sector, if your CD ROM drive, the CD media or the writer used to create them is in any way not up to scratch the media check may fail. To verify this grab an ISO from another mirror and burn it, if it still fails change your hardware.. I often use Sunsite in the UK for downloads as its in the UK, I've not had any problems yet, alternative again would be to use Azureus and download the DVD iso from the torrent and burn that, certainly I have never had that fail... but if the install works anyway, I wouldn't worry too much Regards Pete Kenneth Kalmer wrote: >Dear community > >I've just noticed that the CentOS 4.0 ISO's I downloaded from >ftp.sunsite.org.uk fails the media check on installation. All four >fail. The md5 checks pass and I've done 5 full installations from the >set of failed cd's and no problems what so ever. I never bothered to >do the media check untill a friend asked me what it does... > >The installation works, wonder what the problem could be? Any >suggestions or should I provide more information to help fix this if >it might be a bug? > >Regards > > >