Need good disk dump utility

Paul Koning pkoning at
Mon Apr 25 08:44:17 CDT 2005

>>>>> "Vintage" == Vintage Computer Festival <vcf at> writes:

 Vintage> Is there anything in Linux that will dump a disk image and
 Vintage> put blank space where bad sectors are?  It's not certain if
 Vintage> dd does this.

Neither Linux the manpage nor the info for dd is clear on this.  But
the NetBSD manpage says that if you say "conv=error" then dd will omit
any bad blocks from the output, while if you say "conv=error,sync" it
will substitute zeroes for bad blocks.

You may have to use blocksize=512 for this to work best, otherwise dd
may null out whole buffers full if any one block in the I/O is bad.  I
haven't checked that, though.


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