Transfers of EFI Windows 2012 R2/8.1 may fail with “There was a problem with the VSS subsystem on ‘ComputerName’.” error.
The reason for this is that Recovery partition, created during Windows 2012 R2/8.1 installation doesn’t have enough free space required by VSS. According to Microsoft recommendations, volumes below 500MB should have at least 50MB of free space for successful VSS snapshots.
WORKAROUND:
Open CMD with administrative privileges
1. Type: "diskpart" command, a new prompt will be display.
2. Run “list vol” command to get the list of machine’s volumes. A list of all the available volumes will be display.
3. Select ‘Recovery’ volume using “select vol [volume number]” command
4. Assign drive letter using “assign letter=[desired letter]” command
Example: drive Z will be assigned.
assign letter=z
5. Run “list vol” command to confirm.
6. Exit diskpart using “exit” command
Move volume shadow copy storage of ‘Recovery’ volume to another volume that has enough free space.
Example: If drive z: was assigned to the recovery partition and you have the available space at c:
run the following command: vssadmin add shadowstorage /for=z: /on=c: /maxsize=unbounded
There are some Windows versions when the option "add" is not available in tha case use the next syntax.
vssadmin resize shadowstorage /for=z: /on=c: /maxsize=unbounded
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