Tascam HD-R1 Technical Information page 20

Format Media=cf
or
Format Media=usb
The media will be formatted unless there is an error.
If resending the command occurs after the time limit, an error is returned.
5. Query the current media type
Query
Command
Media?
This shows whether the currently used media is a CF card or USB memory.
6. Designate the media
Input a command like one of the following to designate the media to use.
Command character string
Media=cf
or
Media=usb
The media will be designated unless there is an error.
TASCAM HD-R1 RS-232C Protocol Specifications
HD-R RESPONSE
media=CF
or
media=USB
20 TEAC Corporation