Usually single sided 40 Track 3" disk drives are used in CPCs, whereas 40 tracks is the official specification, practically 42 tracks could be used. The FDC controller can be used to control 80 tracks, and/or double sided drives also, even though AMSDOS isn't supporting such formats. AMSDOS is supporting a maximum of two disk drives only.
== Datasheets ==
* [[Media:UPD765 Datasheet OCRed.pdf]] - uPD765 disc controller
* [[Media:FDC9229BT Datasheet.pdf]] - FDC9229BT data separator (that usually assists the uPD765 chip)
* [[Media:DDI Schematic.png]] - DDI-1 Schematic (disc interface for CPC464)
[[Category:Hardware]][[Category:CPC Internal Components]][[Category:Programming]][[Category:DATA Storage]]