On Friday 23 November 2007 17:14, Marko Vojinovic wrote: > [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 > > where the checksum is *the same* (while being wrong) for both dvds. Nero > and K3B reported no errors. None of the discs boots any machine I tried, > but they do mount correctly: Ok, the issue is solved, and just for the record, the discs *are* bootable. The two machines where discs don't boot are a bit oldish, and have dvd reader units that do read dvd's, but do not boot off them. This is a first time for me to see such hardware. Anyway, thanks to all who helped. I am not acquainted with the readahead bug from the past, and I do not know if this is its reappearance, but since there exists a definite way to checksum the disc, I am not going to look into it further. Too much other things to do... ;-) Best, :-) Marko Marko Vojinovic Institute of Physics University of Belgrade ====================== e-mail: vmarko@xxxxxxxxxxxx