TCC > Variables & Functions > Functions:
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@REMOVABLE[d:]: Returns 1 if the specified drive is removable (e.g. floppy disk, removable hard disk, USB storage device, etc.), 0 otherwise. The drive letter must be followed by a colon.
Examples:
echo %@removable[e:]
echo %@removable[%_disk]
Help URL: http://jpsoft.com/help/index.htm?f_removable.htm