On 6/12/05, Grand Demon <granddemon@xxxxxxxxx> wrote: > Today I downloaded the four Fedora Core 3 ISO images. I calculated the > md5 checksums with the md5sum utility and all four matched up to the > expected values. > > However, when I burned the images in Nero (under Windows) and set it > to verify the disks, Disk Two and Disk Three failed. It stated that > certain Sectors could not be read. Those same two disks failed under > Fedora Core's media test. > > I also tried to burn the Disk Two image in Toast (under Mac OSX). When > that verified the disk, it also failed with 'Sector xxx could not be > read' errors. I went through with the install anyway. Disk one's files > worked fine (as expected), but Disk Two failed out on one file. When I > tried the second Disk Two disk (the one I burned under Mac OSX) did > work, however. I didn't have many files coming off Disk Three, so it > didn't fail. Disk Four also went fine. > > What I am wondering is two things. 1) Why would the verification and > burning of the disks fail under two different OSes and burning > programs despite the md5 checksum being correct? 2) Why would the Mac > OSX-burned disk be corrupted in different areas than the > Windows-burned disk? > > I have not tried to burn/verify Disk Two and Three under Linux because > I don't want to "waste" another CD-R. I assume it will generate > similar results. Any insight on what occurred here would be great. The > install was successful so that isn't the problem... I am just curious > as to what caused these anomalies... > > -- > Grand Demon > Media as well as burners are not created equal. Your burner may not have a burning algorithm that exactly matches this particular manufacturer. Although the media may be listed as 48X or higher you may need to use a much lower speed in order to get satisfactory results. Try setting the burn speed to 10X or 12X. If you bought really cheap or no-name brand media you may need to go even lower.
