This is a discussion on HP-UX 11.31 idisk or Ignite-UX creates bad Protective MBR (GPT) - HP UX ; Hi! First I thought the UEFI 2.1 specification had an error demanding the "StartingCHS" value be 0x000200 to correspond to LBA 1 (Section 5.2.2, Table 12). But it seems that sector counting starts at 1 (not 0), and the value ...
Hi!
First I thought the UEFI 2.1 specification had an error demanding the
"StartingCHS" value be 0x000200 to correspond to LBA 1 (Section 5.2.2, Table
12). But it seems that sector counting starts at 1 (not 0), and the value is
actually correct (LBA counting starts at 0).
(See http://en.wikipedia.org/wiki/Cylinder-head-sector for details)
So HP-UX 11.31 (September 2007) idisk 1.44 writes the wrong value (0x000100)
for StartingCHS in the EFI Protective MBR. Unfortunately, "idisk -l" does not
display any details about the MBR, so nobody would notice the problem.
(The problem is not serious, but some bad DOS-ish application might create a
partition of one sector in size that exactly occupies the space of the GUID
Partition Tabel Header. Anyway, it would be good if HP would follow the
standards)
Enjoy,
Ulrich
I wrote some nonsense:
> Hi!
>
[...]
> (The problem is not serious, but some bad DOS-ish application might create a
> partition of one sector in size that exactly occupies the space of the GUID
> Partition Tabel Header. (...)
Of course that's nonsense: idisk's partition is one sector too big at the
start, allocating the MBR's sector for the partition, and not too small at the
beginning.
>
> Enjoy,
> Ulrich
