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Seagate ST251R - User Manual
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ST251/ST251
RIST277R
Product
Manual
February
3,
1987
36035-001,
Revision
A
920
Disc
Drive,
Scotts
Valley,
CA
95066-4544,
USA
Telephone:
408/438-6550.
Telex:
176455
SEAGATE
SCVL
c5S»
seagate
2
Table of Contents
Main Page
Table of Contents
3
Specification Summary
9
Drive Capacity
9
Unformatted Capacity
9
Formatted Capacity
9
Physical Organization
9
Access Time Definition and Timing
10
Step Pulse Period and Seek Method
10
Functional Specifications
11
S Recording Methods
11
Physical Specifications
11
Reliability Specifications
12
Read Error Rates
12
Bit Jitter
12
Media Defects
12
St277R
13
Environmental Specifications
13
Ambient Temperature
13
St251
13
St251R/277R
13
Temperature Gradient
13
Relative Humidity
14
Altitude Limits
14
S Shock and Vibration Specifications
14
Operating Vibration
14
Figure 1. Typical
17
Figure 2. Typical Power-On Sequence
17
Figure 3. Drive Mounting Dimensions
20
Handling Precautions
21
Shipping Zone
21
Auto-Truncation
21
Figure 4. Read/Write Timing
22
Typical Drive Timing
22
Figure 5. Buffered-Seek Timing
23
Figure 6. Auto-Truncation Timing
23
Drive Configuration
25
Drive Configuration Shunt J7
25
Figure 7. Host/Drive Interface Connectors
25
Drive Select
26
Daisy-Chain/Radial Drive Configurations
26
Write Fault Latch Options: JP1 and J7
26
DC-Unsafe Option: JP2
27
Precompensation
27
Life-Test
27
ST251 1251 RI277R Product Manual, Rev.a
28
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Seagate ST251R Specifications
General
Storage Type
HDD
Interface
ST-506/412
Form Factor
5.25 inch
Rotation Speed
3600 RPM
Average Seek Time
65 ms
Data Transfer Rate
5 Mbit/s
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