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Old 08-15-2012, 04:07 AM   #1
ashishyadav26
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linux utility to zero out hard disk


Hi, I use dd to zero out hard disk.
dd if=/dev/zero of=/dev/sdb2

is there a utility which dose the same but is faster, dd is terribily slow.
 
Old 08-15-2012, 04:41 AM   #2
Mr. Alex
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Code:
dd if=/dev/zero of=/dev/sdb2 bs=1M
will be somewhat faster.

Also use forum tags for code and quotes.
 
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Old 08-15-2012, 05:21 AM   #3
TobiSGD
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As Mr.Alex stated, play with the blocksize option (bs) the standard value for that option is 512, which means that 512 Bytes are copied at a time (which is/was for a long time the standard sector size of harddisks). You can get much better performance with larger values. Which blocksize is optimal for you depends on your hardware, I got good results with blocksizes between 8 and 32 MB, Mr.Alex seems to prefer a blocksize of 1MB. Just try some values here and see which one gives you the best performance.
 
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Old 08-15-2012, 05:39 AM   #4
Mr. Alex
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One more thing worth to be looked at: http://dave.frop.net/disk_overwrite_...vs_dd_vs_shred .
 
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Old 08-15-2012, 05:56 AM   #5
TobiSGD
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Quote:
Originally Posted by Mr. Alex View Post
One more thing worth to be looked at: http://dave.frop.net/disk_overwrite_...vs_dd_vs_shred .
Just keep in mind that in this comparison the disk is not zeroed out, but overwritten with (pseudo) random-numbers from /dev/urandom. /dev/zero is much faster than /dev/urandom:
Code:
tobi@demon ~ :) % dd if=/dev/zero of=/dev/null bs=1M count=1000
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 0.124797 s, 8.4 GB/s
tobi@demon ~ :) % dd if=/dev/urandom of=/dev/null bs=1M count=1000
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 63.3325 s, 16.6 MB/s
This may have an impact of the best blocksize for that task.
 
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Old 08-15-2012, 06:09 AM   #6
ashishyadav26
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Thanks

Thanks next time I will try out these options.
 
  


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