6.7 LS-120 Drive
Table
| 1.68 MB | 1.44 MB | 1.2 MB | 1.2 MB | 720 KB |
| DMF |
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Formatted | 1,720,320 | 1,474,560 | 1,261,568 | 1,228,800 | 737,280 |
capacity (bytes) |
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Sector size | 512 | 512 | 1,024 | 512 | 512 |
(bytes) |
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Sectors | 3,360 | 2,880 | 1,232 | 2,400 | 1,440 |
Magnetic tracks | 80 | 80 | 77 | 80 | 80 |
surface |
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Optical servo | N/A | N/A | N/A | N/A | N/A |
tracks/surface |
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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 |
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25 ms | 25 ms | 25 ms | 25 ms | 25 ms | |
seek |
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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 |
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| KB/sec | KB/sec |
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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