You can configure the volume behavior parameters for SVservice with the CleanSystemWritable registry key.

Parameter Type Description
CleanSystemWritable REG_DWORD If set to 1 and no writable volumes are attached, SVservice clears any changes saved to the system during operation after a reboot. If set to 0, changes are stored in C:\{00000000-0000-0000-0000-000000000000} on system volume. The default value is 0.