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SubjectRe: Weird data corruption?
On Sun, 13 Jun 1999, Pablo Bianucci wrote:

> 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

[most of example snipped]

>
> 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?

I had similar problems until I switched a Creative Labs 24x drive for a
Tae-Il (who?!) 32x drive. You might get away with tweaking the IDE cables
and checking they're seated properly.

My money's on flakey hardware.

Best Regards,
Alex.


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