About badblocks w/dd

[Daniel da Costa Jotha]

Hello!

I running a Debian GNU/Linux 3.0 system with Kernel 2.2 and GNU C
Library 2.2.5.


I don't now exactly if it's a bug.
Also it can be from C Library.

The problem is:
I have a 1.44MB floppy disk that has the 2817th sector bad and its
2816th sector isn't bad; when I try to read this sector with the
command:
# dd if=/dev/fd0h1440 of=/dev/null bs=512 skip=2816 count=1
, it gets an io error. I think it's because dd or the C Library gets
1024 bytes instead of 512 bytes at a time from the device.

The badblocks program, which is not part of fileutils package, has the
same behavior with -b 512, an option that takes 512 bytes per block.

I tested to cp a file that is using this sector from the mounted
diskette (an operation that uses kernel filesystem drivers, which ones
don't use glibc), and I don't encounter any problem.

If there isn't information enough, or if my Brazilian English wasn't
very clear, please tell me.
Thanks very much!

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