Clearing the unallocated disk space

Tom Horsley horsley1953 at
Sun Nov 16 19:09:09 UTC 2014

On Sun, 16 Nov 2014 12:04:31 -0700
jd1008 wrote:

> Before sending the drive for warranty service, what is the best way to
> clean the unallocated blocks?

A way is to run as root "cp /dev/zero tempfile" for one "tempfile" per partition
until the cp fails due to running out of disk space. That will allocate all
free space and write zeroes to it.

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