TCC > Variables & Functions > Functions:
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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.
Examples:
echo %@serial[C:]
echo %@serial[%_disk:]
See also: @LABEL.
Help URL: http://jpsoft.com/help/index.htm?f_serial.htm