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Verify disk wipe #
After zero-filling a disk, verify with hexdump or md5sum and All-Zero Hash Calculator. On a 2.5" 500GB SATA drive, both hexdump and md5sum took 144m16s to run.

hexdump: 
   $ hexdump /dev/sda
   0000000 0000 0000 0000 0000 0000 0000 0000 0000
   *
   7470c06000
7470c06000 hex = 500107862016 decimal, which is the number of bytes on disk.

md5sum and All-Zero Hash Calculator: 
   $ md5sum /dev/sda
   91564846bfd6055945b31bbd831378a7
You'll need the number of bytes or sectors (the latter may be listed on the drive sticker as LBA) to verify the hash: 
   $ fdisk -l /dev/sda
   Disk /dev/sda: 500.1 GB,  500107862016 bytes

   $ testdisk /dev/sda
   Proceed > None > Advanced > Size in sectors
                                976773168

/nix | Jan 29, 2012

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