Messages in this thread | | | Date | Sun, 20 Jun 1999 22:09:37 +0100 (GMT) | From | "Alex Butcher(linkern)" <> | Subject | Re: Weird data corruption? |
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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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