[wellylug] DD no go

David Antliff david.antliff at gmail.com
Sun Apr 6 10:48:16 NZST 2008


On Sun, Apr 6, 2008 at 10:41 AM, Cliff Pratt <enkidu at cliffp.com> wrote:
>  I still think that you may be hitting a 4gb limit. What is in the input
>  file?
>
>  Can you copy the input file into a formatted ext2/3 or FAT32 on that
>  disk? I know that doesn't really help getting the data *out*, but it may
>  show you have problems with the disk. Or it may be inconclusive.

If he's hitting a 4GB limit, why do these fail?

# dd if=/dev/zero of=/dev/sdb seek=8395975 count=5
# dd if=/dev/zero of=/dev/sdb seek=8395978 count=100

He's not copying any files. He's transferring data from one block
device to another. There is no filesystem involved other than the one
holding the /dev/ inodes.

I'd be interested to see what appears in 'dmesg' after running the
first of those commands. /var/log/syslog might have something too.
Could also turn on SMART for that disk (man hdparm) or even run the
manufacturers diagnostics.

If the files were worth more than $100 to me, I'd have bought a second
HDD by now and be done with it.

-- 
David.




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