From MorphOS Library
PFSFormat - Formats a PFS3 partition
DEVICE=DRIVE/K/A, NAME/K/A, NOICONS/S, QUICK/S, DELDIRBLOCKS=DD/K/N, FILENAMESIZE=FNSIZE/K/N, VERIFY/S
DEVICE - Name of device to format NAME - Label of the new volume NOICONS - By default the trashcan directory and the disk.info and trashcan.info icons are created. This flag prevents this from happening. QUICK - Quick formatting. The disk is directly reinitialised, without wiping or checking it first. DELDIRBLOCKS - The number of deldirblocks to create. This can be anything between 0 and 32. One deldirblock contains 31 deldirentries. So, if 31 is specified, the deldir will have a capacity of 31*32 = 992 files. The deldir can be completely disabled by specifying 0 deldirblocks. The default is 2. The number of deldirblocks can also be changed on an already formatted volume by using the SetDeldir command. FILENAMESIZE - The maximum length of filenames. The maximum is 107. Warning: After formatting the filenamelength can only be increased, not reduced. Default is 31. VERIFY - Enables verify on full format. Does not work in combination with the QUICK option.