The cartridge tape interface as found in the 7946 and 9144 products provides a standard tape drive interface as described in
mtio(4) with the following exceptions:
1.
There is only one density.
2.
Only the “raw” interface is supported.
3.
The
MTIOCTOP ioctl(2) is limited. In particular, the command,
MTFSR is not supported.
5.
The record size for read and write operations must be between 1K and 64K inclusive.
Special files
rct0 through
rct3 refer to rewind on close interfaces to drives 0 to 3. Files
rct4 through
rct7 refer to no-rewind interfaces. Files
rct8 through
rct11 refer to streaming rewind on close interfaces. (Only 9144 type devices can stream.) Lastly,
rct12 through
rct15 refer to streaming no-rewind interfaces.