From MorphOS Library
HDRead - Reads sector(s) from device/unit and dumps them to shell
DEVICE/A, UNIT/A/N, SECTOR/A/N, COUNT/A/N, SECTORSIZE/N
DEVICE - Device name from where to read UNIT - Device unit to use SECTOR - Start sector to dump COUNT - Number of sectors to read SECTORSIZE - Optional: sector size
See also: HDTest command.