Re: diskutil and GUIDs

On Nov 23, 2011, at 2:00 PM, [email protected] wrote:

> Message: 1
> Date: Tue, 22 Nov 2011 19:14:11 -0700
> From: Chris Murphy <lists-zXQU9YWDTqjmlV4oE/1sFAC/[email protected]>
> Subject: diskutil and GUIDs
> To: omniadmin OSX <[email protected]>
> Message-ID: <6077FBCC-F71C-4E85-ACB5-280B2E12D79F-zXQU9YWDTqjmlV4oE/1sFAC/[email protected]>
> Content-Type: text/plain; charset=us-ascii
> 
> Does anyone know of a tool to report the unique partition GUID for a partition?
> 
> The diskutil info command is apparently not cutting it. For non-Mac OS filesystems it does not report a GUID at all, and for hfs+ partitions the "Volume UUID" does not match the unique partition GUID in the GPT for that partition.
> 
> 
> 
> Example 1:
> 
> diskutil info disk0s2		[a jhfs+ partition]
> 
> returns a bunch of info including a "Volume UUID". But this UUID does not match the GUID in the GPT at offset 16 for that partition, whereas the GUID at offset 0 does correctly report the GUID as hfs+ partition type. (I am aware the first three blocks of both GUIDs are byte-swapped when stored in the GPT itself, so that's not the problem.)
> 
> Example 2:
> 
> diskutil info disk0sX		[where X is the partition for any non-Mac OS filesystem]
> 
> returns somewhat less info including no "Volume UUID" at all. But even if it did, apparently it wouldn't match the unique partition GUID in the GPT.
> 
> Chris Murphy


Not sure if it would help but you might take a look at gdisk (GPT fdisk)

http://www.rodsbooks.com/gdisk/


Best,

Tim Roberts