The driver interrogates the controller's holding register to determine the type of drive attached. The driver recognizes seven different drives: CDC 9762, CDC 9766, AMPEX DM980, AMPEX 9300, AMPEX Capricorn, FUJITSU 160, and FUJITSU Eagle (the Eagle is not supported by the SC-21).
Special file names begin with ‘
up' and ‘
rup' for the block and character files respectively. The second component of the name, a drive unit number in the range of zero to seven, is represented by a ‘
?' in the disk layouts below. The last component of the name, the file system partition, is designated by a letter from ‘
a' to ‘
h' which also corresponds to a minor device number set: zero to seven, eight to 15, 16 to 23 and so forth for drive zero, drive two and drive three respectively (see
physio(4)). The location and size (in 512 byte sectors) of the partitions for the above drives:
CDC 9762 partitions
hp?f
121440
10080
759-822
CDC 9766 300M drive partitions
up?d
341696
15884
562-588
up?e
358112
55936
589-680
up?f
414048
861760
681-822
up?g
341696
158528
562-822
AMPEX DM980 partitions
hp?f
121440
10080
759-822
AMPEX 9300 300M drive partitions
up?d
341696
15884
562-588
up?e
358112
55936
589-680
up?f
414048
81312
681-814
up?g
341696
153664
562-814
AMPEX Capricorn 330M drive partitions
hp?d
342016
15884
668-699
hp?e
358400
55936
700-809
hp?f
414720
109408
810-1023
hp?g
342016
182112
668-1023
FUJITSU 160M drive partitions
up?f
121600
141600
380-822
up?g
49600
213600
155-822
FUJITSU Eagle partitions
hp?d
375360
15884
391-407
hp?e
391680
55936
408-727
hp?f
698880
109248
728-841
hp?g
375360
432768
391-841
The up?a partition is normally used for the root file system, the up?b partition as a paging area, and the up?c partition for pack-pack copying (it maps the entire disk). On 160M drives the up?g partition maps the rest of the pack. On other drives both up?g and up?h are used to map the remaining cylinders.