On 2013-09-03 12:35, Tony Crisp wrote: > On Mon, 2 Sep 2013, 15:10, James Harper wrote: > > } > > } > What is the best way to wash a disk? > } > > } > I tried this but it is taking forever. > } > > } > dd if=/dev/zero of=/dev/sdg1 > } > > } > } Someone else suggested a tool to do it, but just fyi dd's default block > } size is pretty small (is it 1 byte?) which will be terrible for > } performance. Add bs=1M or something to improve the speed. > > According to Wikipedia..:)
Or you could just check the info page:
mattcen@toto:tmp$ info dd 2>/dev/null | grep -A 13 ^\`ibs
`ibs=BYTES'
Set the input block size to BYTES. This makes `dd' read BYTES per
block. The default is 512 bytes.
`obs=BYTES'
Set the output block size to BYTES. This makes `dd' write BYTES
per block. The default is 512 bytes.
`bs=BYTES'
Set both input and output block sizes to BYTES. This makes `dd'
read and write BYTES per block, overriding any `ibs' and `obs'
settings. In addition, if no data-transforming `conv' option is
specified, input is copied to the output as soon as it's read,
even if it is smaller than the block size.
--
Regards,
Matthew Cengia
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