6.7 LS-120 Drive

Table 6-8

LS-120 Drive

 

1.68 MB

1.44 MB

1.2 MB

1.2 MB

720 KB

 

DMF

 

 

 

 

Formatted

1,720,320

1,474,560

1,261,568

1,228,800

737,280

capacity (bytes)

 

 

 

 

 

Sector size

512

512

1,024

512

512

(bytes)

 

 

 

 

 

Sectors

3,360

2,880

1,232

2,400

1,440

Magnetic tracks

80

80

77

80

80

surface

 

 

 

 

 

Optical servo

N/A

N/A

N/A

N/A

N/A

tracks/surface

 

 

 

 

 

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

70 ms

70 ms

70 ms

70 ms

70 ms

random seek

 

 

 

 

 

Track-to-track

25 ms

25 ms

25 ms

25 ms

25 ms

seek

 

 

 

 

 

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

125

75 KB/sec

 

 

 

KB/sec

KB/sec

 

Nominal sustained transfer

65 KB/sec

55 KB/sec

49 KB/sec

46 KB/sec

28 KB/sec

rate across interface

read,

read,

read,

read,

read,

 

32 KB/sec

28 KB/sec

25 KB/sec

23 KB/sec

14 KB/sec

 

write

write

write

write

write

Buffer transfer rate

4.0 MB/sec

4.0 MB/sec

4.0 MB/sec

4.0 MB/sec

4.0 MB/sec

Specifications 6-7