The Tandy Portable Disk Drive Model 26-3808 is a compact and lightweight disk drive which can be powered by batteries for maximum portability. 

The portable disk drive interfaces to a computer through the RS-232C port. Its 3.5-inch diskettes can store up to 100KB of data.

At launch, the disk drive cost $199.95. Marketing material described the disk drive as follows:

"Get fast access to 100K of data on 3.5-inch floppies. Features menu-driven operation, list of files on disk, plus FORMAT, SAVE, LOAD, KILL and RENAME functions. Transfers data at 19,200 baud. Battery warning lamp. disk access lamp. When the batteries are low, and the unit is in process of saving, loading or backing up, it will finish its job before shutting down. Unit will not function if batteries are low, but will finish the job. Initialization software included. Weighs 1-3/4 lbs. 2 x 4-15/16 x 6-1/8″. Requires four "AA” batteries or AC Adapter (not included)."

Our model has serial number 606075. It has accompanying software on 3.5-inch disk and the 'Tandy Portable Disk Drive Operation Manual Cat. No. 26-3808'.