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Vortex offered an upgrade option that allowed an F1kit consisting of a drive and a installation manual allowing to upgrade a single S-S single drive to be upgraded to an F1a dual D-D dual drive. To do this, one simply had to install an additional BASF 6138 drive in the free drive slot of the F1-S drive case.

These are less expensive drives and were meant to be directly connected as B drive to a CPC 464 with DDI-1 or a CPC 664/6128. Since these drives do not ship with an own controller or a VDOS ROM, they do rely fully on AMSDOS and thus only 40 tracks can be accessed. The Z-drives were basically S-drives without controller.

Vortex offered upgrade kits consisting of a controller, manual, CP/M license and utility disk which upgraded a Z-Drive to a S-Drive, suggesting actual floppy disk drives were identical between the S- and the Z-Series.