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SubjectWeird data corruption?
Hi!

I am experiencing some strange problems. Some ocassional differences come
and go in files, and that is not good.
Rather than giving a verbose explanation I'll post the facts:

===
atomic:/usr# dd if=/dev/cdrom of=dd.iso bs=2048 count=186284
186284+0 records in
186284+0 records out
atomic:/usr# cat /dev/cdrom > cat.iso
cat: /dev/cdrom: Input/output error
atomic:/usr# ls -l *.iso
-rw-r--r-- 1 root root 381511680 Jun 13 17:27 cat.iso
-rw-r--r-- 1 root root 381509632 Jun 13 17:23 dd.iso
atomic:/usr# cmp -l -c cat.iso dd.iso
86268957 377 M-^? 357 M-o
92946429 30 ^X 20 ^P
113527767 377 M-^? 357 M-o
220883701 377 M-^? 357 M-o
220889813 357 M-o 377 M-^?
cmp: EOF on dd.iso
atomic:/usr# cmp -l -c cat.iso /dev/cdrom
2053111 377 M-^? 357 M-o
86268957 377 M-^? 357 M-o
113527767 377 M-^? 357 M-o
220883701 377 M-^? 357 M-o
atomic:/usr# cmp -l -c dd.iso /dev/cdrom
2053111 377 M-^? 357 M-o
92946429 20 ^P 30 ^X
220889813 377 M-^? 357 M-o
cmp: EOF on dd.iso
===

and

===
atomic:/usr# cat /dev/cdrom > /dos/winc/temp/cdimage/cat9.iso
atomic:/usr# cmp -l -c cat.iso /dos/winc/temp/cdimage/cat9.iso
1728599 377 M-^? 357 M-o
cmp: EOF on cat.iso
atomic:/usr# cmp -l -c /dev/cdrom /dos/winc/temp/cdimage/cat9.iso
atomic:/usr# cmp -l -c /dev/cdrom cat.iso
cmp: EOF on cat.iso
atomic:/usr# cmp -l -c cat.iso /dos/winc/temp/cdimage/cat9.iso
cmp: EOF on cat.iso
atomic:/usr# cmp -l -c cat.iso /dos/winc/temp/cdimage/cat9.iso
cmp: EOF on cat.iso
===

This happens specially when moving large chunks of data from the CDROM, but
files that at first are different and then are the same appear on the hard
drives (the second cut shows this).

Some info about the system:
First, software: linux kernel 2.2.9, cmp from diff-2.7, cat from textutils-1.22
and dd from fileutils-3.16 (debian 2.1 packages)
Then hardware: Dual Pentium 166, Soyo mainboard with integrated IDE (HX
chipset), 128 Mb of RAM (43 passes of memtest86 1.3 didn't show any errors),
a 6.4 Gb Maxtor IDE disk and a 40X IDE Pioneer CDROM (both with DMA disabled).

Anybody has any clue about this?

Thanks!

Bye & Good Luck!

Pablo B.

P.S.: I am not subcribed to the list, so please reply directly. Thanks again!





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