=== F1-X and F1-XRS (5,25") ===
The F1-X model is based on a single BASF 6138 (81690-001) or 6139 type 5,25" disk drive. These are improved revisions of the BASF disk drives which are designed slightly more compact (~1cm shorter to fit in the slimmer F1-X casing), and also a number of mechanical design flaws that affected durability were corrected. The F1-XRS variant is equipped with an additional RS232-C interface.
<gallery>