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From: - Tue Sep 16 05:57:56 2003
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Date: Tue, 16 Sep 2003 05:57:49 -0400
From: Dyson
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To: sezero@superonline.com
Subject: Re: DVD packet writing
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Yes I did unmount and remount it before the diff.
I think it is actually the cp command that is the culprit. It verifies
every file after it is written. On the Philips DVDRW228 it has a blue
light for reading and red for writing. It seemed to write then read
over and over as I copied the linux source tree to it.
I did another test with large files 500MB, 1.2GB and 2.9GB using tar
then diff'ed them after restoring to another directory on the hd.
I'm thinking of working on a script that will read the directory
contents then pass that to dd or sdd to do each file in a batch mode. I
could call it cpdir, cpudf, cpcdr or something.
Thanks,
Dyson
sezero@superonline.com wrote:
Hi Dyson:
the directories were missing. However the files it
did copy were the same.
I don't have a dvd writer, so I can't say anything
about that. But about the "files being the same":
Can you please:
- umount the newly written fs and remount it r/o
and then compare ( to ensure nothing is cached);
- write some files to the fs, delete some others,
write some others again. (overwriting a file
doesn't count). Then maka the comparison again
after re-mounting the fs r/o.
On cdrw media, I occasionally hit some corrupted
files using the above test. Most times (not always)
the corruption occurs when delete happens at about
the same time the write.
Regards,
Özkan Sezer
