Booting from USB drives

Carl Lowenstein carl.lowenstein at
Wed May 15 14:58:32 PDT 2013

On Wed, May 15, 2013 at 2:33 PM, Franklin Johnston <fpjohnston at>wrote:

> On Wed, May 15, 2013 at 7:21 AM, Rich Ernst <rernst at> wrote:
> > If you want to pursue this further, I'd suggest using linux to write
> > zeros to the whole drive.  Forgot the actual dd command but it's
> > fairly simple and will then ensure all blocks have been written over.
> >
> FWIW, the command is
> dd if=/dev/zero of=/dev/sdXXX (e.g., /dev/sdb)

It will run faster if you send data 1MB at a time instead of 512 bytes.
Of course, with a solid-state drive you don't have to wait for the platter
to rotate to the right position.

   dd if=/dev/zero of=/dev/sdXXX bs=1M


    carl lowenstein         marine physical lab     u.c. san diego
                                                 clowenstein at

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