[Info-vax] questions on initialize/gpt

[Stephen Hoffman]

On 2015-06-23 18:16:55 +0000, hb said:

> DEMO$
> DEMO$ dump/header/bl=co=0 disk$gpt:[000000]gpt.sys
> ...
> Which shows what the GPT.SYS covers: the protective MBR, the primary 
> GPT and the secondary GPT. The size of the GPT is 33 Blocks. It looks 
> like INIT wastes one block, the one at LBN 9999. For more info on the 
> GPT: https://en.wikipedia.org/wiki/GUID_Partition_Table.

Three blocks were wasted.  The GPT requires 33 blocks at the front 
(lowest addresses) for the MBR and GPT, 32 at the back (highest 
addresses) for the "spare" GPT.  Wastage which with a cluster factor of 
one is somewhat unexpected.

> And you can copy the LD disk image to your system and get a second 
> opinion of other OSes on this GPT:

The partitioning data is also available via...

$ sb :== $sys$setboot.exe
$ sb -s -f disk$gpt:

The -s switch is show, and -f is the target device; that switch started 
out as the target file.

What that GNU GPT tool is grumbling about would require some digging.


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