md5sum on CD
john.moniz-rieW9WUcm8FFJ04o6PK0Fg at public.gmane.org
Thu Nov 24 19:39:59 UTC 2005
D. Hugh Redelmeier wrote:
>| From: Moniz Family <john.moniz-rieW9WUcm8FFJ04o6PK0Fg at public.gmane.org>
>| I'm having some problems burning CDs and am trying to check whether it's the
>| burner or the CDs.
>You've gotten some good advice -- like using the right hash.
Some excellent advice, thanks to all.
>Checking on a file-by-file basis is not really good enough. There are
>things that are not inside files. For example, metadata. Also (I
>think) boot records.
>But there is another problem that you might well be hitting.
>See, for example:
> The Linux IDE CD driver in 2.6 tries to read ahead, even past the end of the
> CD or DVD. Even when the program issuing the original read request was only
> trying to read legitimate parts of the disc (albeit near the end).
> The result is spurious I/O errors and read failures.
> It does not seem that this driver bug is going to be fixed soon.
>To work around this problem, I wrote the two shell scripts that I have
>- isopad: add enough padding to prevent ide-cd read-ahead getting
> into trouble (can also remove the padding)
>- isoburn: burn and check a .iso. Uses isopad.
> Warning: you may have to adjust the settings of the shell variables
> "drive", "device", and "speed" to match your environment.
The only time I was using the 2.6 kernel was when trying to install
Fedora Core 4. Maybe that's why my Disk 3 failed the media test??? All
of the burns and checks were done with RH9 and kernel 2.4.
One thing I didn't try with cdrecord was the pad option.
Thanks for the scripts. You're taking me a little past my experience
level, but I may be able to use them.
The Toronto Linux Users Group. Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml
More information about the Legacy