=== 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 the latest revisions of the disk drives used in Vortex 5,25" drives. They are designed slightly more compact, 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.
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