=== F1-X and F1-XRS (5,25") ===
The F1-X model is based on either a single BASF 6138 (81690-001) or a single BASF 6139 5,25" disk drive. The BASF 6139 is an a revisioned version which is slightly more compact (~1cm shorter), and also a number of electronical and mechanical design flaws that affected durability were corrected. The F1-XRS variant is equipped with an additional RS232-C interface.
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