From MorphOS Library
PFSDiskValid - Analyses or fixes a PFS3 volume
DEVICE/A, VERBOSE/S, FIX/S, ANALYSE=ANALYZE/S, TD64/S
DEVICE - The device that is to be analysed VERBOSE - Normally diskvalid gives a summarised output of what it is doing, and only reports errors. In verbose mode every individual file that is tested will be printed. This can become a very long list. FIX - Enables fix mode ANALYSE - Enables analyse mode TD64 - Enables TD64 mode. Only needed if your device is larger than 4G and does not support direct scsi.