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Remove drive letters allocated unnecessarily to small partitions:
The MSR partition is required to boot Windows 7 and later operating systems. Ordinarily, this partition does not have a drive letter assigned to it. If a drive letter is assigned then this can cause problems with Microsoft Volume Shadow copy Service (VSS).
The same is also true of Original equipment manufacture (OEM) utility and recovery partitions such as DELL utility partitions. These partitions also do not require drive letter associations and allocating a drive letter can cause VSS to fail.
For more information on correcting this see article: Removing a drive letter from the MS System Reserved partition
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Increase shadow storage space:
To see the amount of storage space allocated and used for Volume Shadow Copies run this command from a command prompt with elevated privileges:
Code Block language text Vssadmin list shadowstorage
To allocate more storage (e.g. 50GB) run this command:
Code Block language text vssadmin resize shadowstorage /For=C: /On=C: /MaxSize=50GB
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Remove old VSS snapshots:
During normal Windows operation, restore points are created during software installation and other regular operational tasks. These restore points create snapshots that reside in an area of the disk and consume disk space.
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