Does hard disks have UUID/GUID on windows platform? I looked at the Win32_DiskDrive class and "details" in diskpart utility output. But couldn't find any properties that would be show the UUID. I can see that Win32_DiskDrive::Signature is same as DiskPart::Device ID but they are unsigned int 32. Win32_DiskDrive::DeviceID also doesn't look like GUID. Now when I look at the VHD image format specification, it mentions that the footer (of a VHD) contains a field called "Unique ID" which is a 128-bit UUID. So my questions are whether there is UUID for each physical disk on windows? If so, how to get it. If there is no UUID, what is the VHD spec is talking about? Thanks. ?: How would I post a question to multiple forums within same forum category?

Hi, Run mountvol command and you will be able to get the volume GUID in the output. Following is one example: \\?\Volume{47ba2efc-2db1-11e0-88f8-806e6f6e6963}\ C:\ \\?\Volume{47ba2efd-2db1-11e0-88f8-806e6f6e6963}\ D:\ Best Regards, Vincent Hu

I'm talking about the disk UUID. I think that is whas VHD image format specification refers to. This is what VHD spec says. Unique ID Every hard disk has a unique ID stored in the hard disk. This is used to identify the hard disk. This is a 128-bit universally unique identifier (UUID). This field is used to associate a parent hard disk image with its differencing hard disk image(s). Mountvol gives guid for the formated partion and VHD can have more than one of those. MD

Hi, Now when I look at the VHD image format specification, it mentions that the footer (of a VHD) contains a field called "Unique ID" which is a 128-bit UUID. >>Where did you get the format specification? Best Regards, Vincent Hu

Download: VHD Specs - Microsoft Download Center - Download ... Above link let you download "Virtual Hard Disk Format Spec_10_18_06.doc" which describes the VHD specs.

I think this is how microsoft contructs Disk GUID out of MBR Disks UniqueID (Disk Identifier) [got info when dealing with wbadmin and Diskpart] UniqueID of our Disk as reported by DISKPART - DISKPART> detail disk VMware, VMware Virtual S SCSI Disk Device Disk ID: 4E969FEA Now, wbadmin reports GUID for our same Disk as: Disk name: VMware, VMware Virtual S SCSI Disk Device Disk number: 2 Disk identifier: {4e969fea-0000-0000-0000-000000000000} Total space: 40.00 GB Used space : 177.41 MB Volumes: F:[Data-Disk-01] and i suppose - this {4e969fea-0000-0000-0000-000000000000} - is 128 Bits in strength. So they simply appends Zero to the GUID leftover bits.