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List: gentoo-dev
Subject: [gentoo-dev] dd: reading `/dev/hda7': Input/output error (not a hardware problem) - kernel problem?
From: Bastian Fuchs <bastiaf () gmx ! de>
Date: 2002-10-31 17:17:13
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Hi!
I have some problem to read partitions with dd, but I think it's not a
hardware problem. (No badblocks or something else.)
I have two disks hda and hdb. Its possible to read hda1 and hdb1 with dd
without an error. But on all other partitions I get an "Input/output" error.
---------------------------------------------------------------------------------
vulpec ~ # fdisk -s /dev/hda1
88326
vulpec ~ # dd if=/dev/hda1 of=/dev/null bs=1k skip=88000
326+0 records in
326+0 records out
hda1 has 88326 blocks and dd reads 88326. OK.
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
vulpec ~ # fdisk -s /dev/hda7
4200966
vulpec ~ # dd if=/dev/hda7 of=/dev/null skip=4200000 bs=1k
dd: reading `/dev/hda7': Input/output error
964+0 records in
964+0 records out
vulpec ~ # dmesg | tail
...
attempt to access beyond end of device
03:07: rw=0, want=4200968, limit=4200966
hda7 has 4002966 blocks, but only 4002964 blocks a read. Why to blocks are
missing? And dmesg says, that dd wants to access 2 blocks beyond the end of
device?
---------------------------------------------------------------------------------
Again:
This problem only occures with all partitions (ext2, ext3, ReiserFS) except
the first. The partition table is ok and there are no bad blocks. I find some
postings with google, which reports the same problem, but mostly with cdroms,
but harddiscs too. Some people think, this is an kernel problem, but the
mails/postings are from 2000 oder 2001.
It seems that nobody really knows, whats wrong. I hope you can help me. Maybe
it's an bug ...
- Bastian Fuchs
PS:
vulpec ~ # uname -a
Linux vulpec.wg.j.th.de 2.4.19 #1 Mon Oct 28 02:30:04 CET 2002 i686 AMD
Duron(tm) processor AuthenticAMD GNU/Linux
vulpec ~ # dd --version
dd (fileutils) 4.1.11
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