![]() This is something that will change in future releases, hopefully. Strangely enough, the Swiss army knife of disk and volume management in Windows diskpart.exe can’t display the Volume GUID. ![]() ![]() If you compare the data in this key for the Volume GUID and the DOS drive letter for a given volume, you will see that they match meaning that they point to the same volume. You can also see all the volume GUIDs for every volume the OS has ever seen under the registry key:Īt this location you will also find the “regular” drive letter assignments. Not strange if you consider the command prompt’s origins. I have not been able to use the Volume GUID from the command line, but that is also the only limitation I have found. (Notice the question mark by the drive icon in the navigation bar and the info pane.) Press enter and you will see the contents of the volume displayed. To prove that the volume GUIDs really are the “true” path to the volume, copy one of the strings and past it into Explorer or the Run dialog. Running mountvol.exe without any arguments will show you help for the utility, but also the current Volume GUID to drive letter/mount point relationships. So how do we find the Volume GUID? The easiest way I have discovered is by the use of the mountvol.exe utility. When configuring highly available virtual servers in Hyper-V with Windows Failover Clustering, for example. This is actually the recommended practice in some situations. You can work around this by using mount points e.g., but you can also reference the volume by its GUID directly. On systems with a lot of storage you will often run out of drive letters for your partitions and volumes. This ensures that Windows can always uniquely identify a volume, even though its drive letter has changed. The Volume GUID is assigned the first time the OS encounters a volume and it does not change. (Windows Home Server, which is actually a custom version of Windows Server 2003 has done away with the use of drive letters completely.)This GUID is called the Volume GUID or the Unique Volume Name. Instead Windows uses a GUID to identify each volume or partition. However, the Windows operating system does not depend on them. Drive letters are still used today due to their ubiquity and for compatibility. This option has been removed in Disk Management for Vista.The use of letters to identity volumes and partitions in Windows is something we have inherited from MS-DOS. Logical drives function like primary partitions except that they cannot be used to start an operating system. An extended partition is a container that can hold one or more logical drive. Extended partitions can contain multiple logical drives that can be formatted and have drive letters assigned to them. See: Windows Help and How-to: What are system partitions and boot partitions? and The Storage Team at Microsoft - File Cabinet Blog : Understanding the error message "There is not enough space available on the disk(s) to complete this operation" when you create a volumeĪ type of partition on a hard drive that should be used if you want to create more than four Primary partition. If you want to create more than three partitions, the fourth partition is created as an extended partition. Primary partitions can be used to install and start an operating system. Only up to four primary partitions, or 3 primary partitions and 1 extended partition can be created on a single hard drive. A type of partition created on a hard drive that can host an operating system and functions as though it were a physically separate hard drive.
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