On Wed, 26 Mar 2008 01:21:55 -0400, Lisa <(E-Mail Removed)> put
finger to keyboard and composed:
>On 26 Mar 2008 04:18:32 GMT, Arno Wagner <(E-Mail Removed)> wrote:
>
>>Previously Lisa <(E-Mail Removed)> wrote:
>>> I have a USB external HD case:
>>> http://www.newegg.com/Product/Produc...82E16817332008
>>
>>> I put 3 drives in. Using normal mode. Not spanning. 2 of the drives
>>> are GPD or GUID or something that Vista made. How can I convert these
>>> drives to regular drives that XP can see? I need to access these from
>>> Vista and XP. I can't find any way to convert. Paragon can't do it.
>>> Neither can Partition Magic. I have Googled and can't really find a
>>> way. Can anyone help?
>>
>>Repartition and reformat under XP?
>>
>>Arno
>
>I can't. In disk mgt I can see the partitions in xp. Xp even
>identifys them as GPT Protective Partitions. Theres no drive letter
>in xp. All the options like format are grayed out.
It appears that the MBR and partition table that XP sees is a dummy.
For a GPT disc, the real partition table is at sector 2, not sector 0,
and partition 1 starts at sector 34, not 63. AFAICT, if you want your
hard disc file systems to be visible to both XP and Vista, then you
will need to backup your data and repartition and reformat using NTFS.
See
http://en.wikipedia.org/wiki/GUID_Partition_Table
"The primary purpose of the MBR at the beginning of the disk is to
prevent MBR-based disk utilities from mis-recognizing, and possibly
over-writing, GPT disks. A single partition, encompassing the entire
GPT drive, is indicated. The System ID for the partition is set to
0xEE, indicating that it uses GPT. Because of this, EFI ignores the
MBR. Some 32-bit OSes which cannot read GPT disks nevertheless
recognize this ID and present the disk as an inaccessible GPT disk."
- Franc Zabkar
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