Andre Robatino wrote:
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).
I had the idea that this problem had been fixed[1], as I suspect you do
also. I haven't seen it recently, but having gotten into the habit of
using dd to check only what I expect to write, I wouldn't have seen it
in every case. The old solution was to turn off readahead, I tried that
recently, but there really *was* a problem in my case.
I no longer expect an error at end of data, and I don't use the noerror
option to dd because of that.
[1] on a last read shorter than the readahead, I think you get all of
the data actually read and no error. Certainly the data doesn't appear
to be truncated on error any more AFAIK. However, depending on how the
data was padded, you may get some data which really *is* on the DVD and
is *not* part of the ISO image.
--
Bill Davidsen <davidsen@xxxxxxx>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot
