Function GetMinDiffAreaSize As Long
long long GetMinDiffAreaSize()
The shadow copy storage area minimum size is a per-computer setting. Prior to Windows Server 2003 Service Pack 1 (SP1), this was fixed at 100 MB. With Windows Server 2003 SP1, the shadow copy storage area has a minimum size of 300 MB and can be increased in 300 MB increments up to 3000 MB (3 GB). This setting is stored in the MinDiffAreaFileSize value of type REG_DWORD in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VolSnap (the value is the size, in MB).
Windows XP and Windows 2003: This method is not supported until Windows 2003 SP1.