@CWDS[d:] : Returns the current working directory of the specified disk drive in the format d:\pathname\. The drive letter must be followed by a colon.
If the argument is a partial filename without a drive, @CWDS will expand the filename to get the drive.
Examples:
echo %@cwds[C:]
c:\Windows\
echo %@cwds[%_disk:]
D:\release\version17\
See also: @CWD.