Strange booting problem

[jd1008]

On 06/30/2015 05:42 PM, Chris Murphy wrote:
> On Tue, Jun 30, 2015 at 5:38 PM, jd1008 <jd1008 at gmail.com> wrote:
>>
>> On 06/30/2015 05:33 PM, Chris Murphy wrote:
>>> On Tue, Jun 30, 2015 at 5:26 PM, Gordon Messmer
>>> <gordon.messmer at gmail.com> wrote:
>>>
>>>> So you could dd 512 bytes of /dev/zero to the drive, or use "wipefs -a
>>>> /dev/sdX", then use parted to "mktable gpt" and set up partitions.
>>> That will not work. Parted replaces the PMBR in such a case. So does
>>> gdisk.
>>>
>>> wipefs -a after parted or gdisk will cause both PMBR and GPT primary
>>> and backup headers to be invalidated. So to wipe or invalidate the
>>> PMBR has to be done with dd.
>>>
>>>
>> OK, so after I partition with parted, I clobber the first 512 byte sector
>> with zeros, then the drive will retain partitioning info?
> GPT partitioning info, yes. If you're using an OS that doesn't know
> what GPT is (?) then you have just two options remaining which is BIOS
> boot order or the one time boot menu.
>
>
>
>
Sigh!!!!
Thanx!