Booting from USB drives

Franklin Johnston fpjohnston at gmail.com
Thu May 16 09:10:05 PDT 2013


Thanks for the improvement.

However, zeroing the two drives doesn't make any difference. After
partitioning, formatting, and installing, the 32 GB drive always boots, and
the 16 GB never does.


On Wed, May 15, 2013 at 2:58 PM, Carl Lowenstein
<carl.lowenstein at gmail.com>wrote:

> On Wed, May 15, 2013 at 2:33 PM, Franklin Johnston <fpjohnston at gmail.com
> >wrote:
>
> > On Wed, May 15, 2013 at 7:21 AM, Rich Ernst <rernst at rernst.com> 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
>
> --
>     carl lowenstein         marine physical lab     u.c. san diego
>                                                  clowenstein at ucsd.edu
>
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