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@SERIAL[d:]:  Returns the serial number of the specified disk drive (in hex, i.e.: ABCD:0123). The drive letter must be followed by a colon.

 

If the argument is a partial filename without a drive, @SERIAL will expand the filename to get the drive.

 

Examples:

 

echo %@serial[C:]

1B:EB6D

 

echo %@serial[%_disk:]

F82B:746

 

See also: @LABEL.