Texas Instruments TravelMate 4000M User Reference Manual page 218

Note: You must purchase a third party 2.5" SCSI hard
drive from your computer supply store or reseller. Seagate
and Toshiba models are known to be compatible.
6. Attach one end of the SCSI connector to the SCSI drive
and the other to the connector on the bottom of the
Portable CD-ROM Docking System.
Note: There will be left-over pins on the right side of the
connector.
7. Place the drive in the Portable CD-ROM Docking System.
SCSI Hard Drive Enabler Kit
Portable CD-ROM Docking System 12-17
Options