Seagate ST251 - Functional Specifications; S Recording Methods; Physical Specifications

1.4 FUNCTIONAL SPECIFICATIONS
ST251 ST251R ST277R
Rotational
Speed:
3,600 RPM ± 0.5%
Recording Density: 9,935 BPI
14,902 BPI 14,902 BPI
Flux
Density: 9,935 Fel 9,935 Fel
9,935 Fel
Track Density: 777 TPI 777 TPI 777 TPI
Interface: 8T412
ST412 ST412
Recording Method: MFM
RLL (2,7) RLL (2,7)
Data Transfer Rate:
5.0 Mbits/sec. 7.5 Mbits/sec. 7.5 Mbits/sec.
1.5 RECORDING METHODS
The 8T251 is designed to operate with the 8T412 interface with MFM
encoding at
5.0 megabit/sec. data transfer rate.
Caution: Operation of an MFM
drive with an RLL controller Is not ap-
proved by Seagate.
The 8T251R and 8T277R are designed
to operate with the 8T412 in-
terface with Run Length Limited (2,7) encoding at 7.5 megabit/sec.
data transfer rate.
1.6 PHYSICAL SPECIFICATIONS
Height:
Width:
Depth:
Weight:
1.63 inch. max. (41.4 mm)
5.77 inch. max.
(146.1 mm)
8.00 inch. max. (203.2 mm)
2.75Ibs. (1.25 Kg.)
8T2511251 R/277R Product Manual, Rev.A
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