These are the ''Low-Capacity'' drives from Vortex, for use on CPC 664/6128 or CPC 464 with DDI-1 (ie. on computers that already have a FDC and AMSDOS). There doesn't seem to be anything special about this product, just an off-the-shelf disk drive, shipped with a CPC-specific connection cable.
Although the drives might have 80 tracks (?), AMSDOS can access only access 40 tracks. No info if TO BE CONFIRMED: Are the drives are 80 track, double-sided, and if yes, if they do have a side-select switch for accessing ? Is there any way to access the second sidewith AMSDOS (e.g. side switch??)
== Vortex -X Drives (720K/disk) ==