Strange booting problem

[Chris Murphy]

On Tue, Jun 30, 2015 at 4:04 PM, jd1008 <jd1008 at gmail.com> wrote:
>
> Hi Rick,
> Re: my /dev/sdb:
>
>
> dd if=/dev/sdb bs=2 count=1 skip=255 2>/dev/null | od -x
> 0000000 aa55
> 0000002
>
> If these are the bytes that indicate a boot signature,
> can they be "null'ed" safely??

How do you define safely? It means the entire MBR record is invalid,
including the partition scheme.

# wipefs -a /dev/sdb

Will do exactly the above on MBR disks, it removes the MBR signature
making it invalid. If the GPT partition scheme is used, wipefs will
remove the GPT primary and backup header signatures, and the PMBR
signature, making all three of them invalid and thus not a partitioned
drive.

-- 
Chris Murphy