> Marko Vojinovic wrote: >> Ok, I downloaded the brand-new Fedora 8 iso file: >> >> [vmarko@sith ~]$ sha1sum Fedora-8-i386-DVD.iso >> 782a0e80de1b8e9f24e10e40055cc1b545390cbd Fedora-8-i386-DVD.iso >> >> After burning it to two dvd's on two different machines (one Windows, >> the >> other Linux) using different software (Nero and K3B), I get: >> >> [vmarko@sith ~]$ sha1sum /dev/dvd >> 04e39c4be1cf577b98a8b94ff61bdb60252ec6cb /dev/dvd >> > > "sha1sum /dev/dvd" is not a reliable way to read a disc, though it may > work on some hardware. Try using the rawread script at > > http://www.troubleshooters.com/linux/coasterless.htm > > instead. This uses the isoinfo command to determine how big the ISO > file is, then runs a dd command that attempts to read exactly that much > off the drive. If this still fails, then please report back. I'm > currently seeing a return of the old mediacheck problem (linux readahead > bug). Ok, I followed advice from that link, and it actually works: [vmarko@sith ~]$ ./rawread /dev/dvd | sha1sum dd if=/dev/dvd bs=2048 count=1672241 conv=notrunc,noerror 1672241+0 records in 1672241+0 records out 3424749568 bytes (3.4 GB) copied, 490.465 s, 7.0 MB/s 782a0e80de1b8e9f24e10e40055cc1b545390cbd - So it *seems* that everything is ok with the discs. Now I have to figure out why those two machines do not boot from either of them. But that is another issue... I was not aware that sha1sum&friends have problems to determine the actual size of data when reading optical media. This is a valuable lesson! Thanks for help! ;-) :-) Marko Marko Vojinovic Institute of Physics University of Belgrade ====================== e-mail: vmarko@xxxxxxxxxxxx
