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1 - Al Kossow's Bitsavers

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REV.B<br />

PRODueT DESCRIPTION<br />

1.2.6 BMD-720 Hard Disk Drive Specification<br />

Capacity<br />

Unformatted<br />

per Track<br />

Formatted<br />

per Track<br />

per Sector<br />

Number of Cylinders<br />

Number of Tracks<br />

Sectors per Track<br />

Bytes per Sector<br />

Number of Disks<br />

Number of Heads<br />

25.5<br />

10,416<br />

20.0<br />

8,192<br />

256<br />

615<br />

2460<br />

32<br />

256<br />

2<br />

4<br />

MBytes<br />

bytes<br />

MBytes<br />

bytes<br />

bytes<br />

Transfer Rate<br />

Access Time<br />

Track-Track<br />

Average Seek<br />

Max. Seek<br />

Disk Speed<br />

Recording Method<br />

Recording Density<br />

Track Density<br />

Interface<br />

5 Mbits/sec<br />

18 ms<br />

69 ms<br />

150 ms<br />

3528 RPH +/-1%<br />

MFM<br />

12900 BPI<br />

910 '!PI<br />

ST-506/412<br />

Environment<br />

Temperature<br />

Humidity<br />

<strong>Al</strong>titude<br />

Conditions<br />

Operatin&<br />

5°C - 50C<br />

8% - 80%<br />

(26C)<br />

3000 m<br />

Storage<br />

-40°C - 6.fC<br />

8% - 85%<br />

( 30C)<br />

10000 m<br />

Shock-Vibration<br />

No Soft Errors<br />

Vibration<br />

Shock<br />

No Hard Errors<br />

Vibration<br />

Shock<br />

PmJer Consumption<br />

0.4 G, 36-500 Hz<br />

8 G, 10 os<br />

2 G, 14-500 Hz<br />

20 G, 10 ms<br />

8.0 w<br />

3 G, 12-500 Hz<br />

40 G, 10 ms<br />

1-7

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