On Jun 3, 10:20, Ashley Carder wrote: No, RX01 (and RX02) are soft-sectored. Soft-sectored disks have one index hole punched near the centre, and an optical sensor detects this once per revolution, indicating the logical start-of-track. Hard-sectored disks have one hole per sector, and the sensor detects these to indicate start-of-sector; the first sector is distinguished because there's an extra hole (the index hole) punched halfway between two sector holes. -- Pete Peter Turnbull Network Manager University of York