pszFileName (PSZ) - input
In the Raw File System, this is the universal naming convention (UNC) name for either a logical partition or physical disk.
Logical partitions are identified using a UNC name in the form of: \\.\X:, where X is replaced with the letter corresponding to the drive.
Physical disks are identified with a UNC name in the form of: \\.\Physical_Disk#, where # is replaced with the physical disk number as reported by the FDISK utility.