User Guide

Specifications 6-7
6.7 LS-120 Drive
Table 6-8
LS-120 Drive
1.68 MB
DMF
1.44 MB 1.2 MB 1.2 MB 720 KB
Formatted
capacity (bytes)
1,720,320 1,474,560 1,261,568 1,228,800 737,280
Sector size
(bytes)
512 512 1,024 512 512
Sectors
3,360 2,880 1,232 2,400 1,440
Magnetic tracks
surface
80 80 77 80 80
Optical servo
tracks/surface
N/A N/A N/A N/A N/A
Sectors/track 21 18 8 15 9
Sector interleave 2:1 1:1 1:1 1:1 1:1
Spare sectors 0 0 0 0 0
Zones (each side) 1 1 1 1 1
Average
random seek
70 ms 70 ms 70 ms 70 ms 70 ms
Track-to-track
seek
25 ms 25 ms 25 ms 25 ms 25 ms
Max single seek 170 ms 170 ms 170 ms 170 ms 170 ms
Average latency 41.67 ms 41.67 ms 41.67 ms 41.67 ms 41.67 ms
Motor RPM 720±0.5% 720±0.5% 720±0.5% 720±0.5% 720±0.5%
Motor start time 800 ms 800 ms 800 ms 800 ms 800 ms
Track density 135 TPI 135 TPI 135 TPI 135 TPI 135 TPI
Track width 125 µm 125 µm 125 µm 125 µm 125 µm
Encoding method MFM MFM MFM MFM MFM
Max flux density 17,334 FCI 17,334 FCI 17,334 FCI 17,334 FCI 17,334 FCI
Recording density 17,334 BPI 17,334 BPI 17,334 BPI 17,334 BPI 17,334 BPI
Nominal transfer rate 150 KB/sec 150 KB/sec 125
KB/sec
125
KB/sec
75 KB/sec
Nominal sustained transfer
rate across interface
65 KB/sec
read,
32 KB/sec
write
55 KB/sec
read,
28 KB/sec
write
49 KB/sec
read,
25 KB/sec
write
46 KB/sec
read,
23 KB/sec
write
28 KB/sec
read,
14 KB/sec
write
Buffer transfer rate 4.0 MB/sec 4.0 MB/sec 4.0 MB/sec 4.0 MB/sec 4.0 MB/sec