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Attach/Detach Packet (all devices)
7-19
7
........ ......0. Single track density
(media TPI = ½ drive
TPI,
double step)
........ ......1. Double track density
(media TPI = drive
TPI)
........ ........ Reserved
........ ....0... 250K bits/sec data
rate (5¼ inch)
........ ....1... 500K bits/sec data
rate (8 inch)
........ ...0.... Floppy media
........ ...1.... Rigid media
........ ..0..... No reserve on attach;
no release on detach
........ ..1..... Reserve on attach;
release on detach
........ .0...... Non-buffered seeks
........ .1...... Buffered seeks
........ 0....... Standard IBM format,
256b sectors are 128 in
track 0
........ 1....... Non-standard; all
sectors same size,
even
track 0
.......0 ........ Soft-sectored media
.......1 ........ Hard-sectored media
......0. ........ Fixed media drive
......1. ........ Removable media
drive
........ ........ Reserved
....0... ........ Zone = track
....1... ........ Zone = cylinder
$12 xxxxxxxx Controller type (refer
to controller type
table)