BS 4850-1:1972
Withdrawn
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Specification for magnetic six-disk packs for data processing Mechanical and magnetic properties
Hardcopy , PDF
15-08-1999
English
14-08-1972
Cooperating organizations
Foreword
Specification
1. General
1.1 Scope
1.2 General requirements
2. Mechanical characteristics
2.1 Environment
2.2 Shock and vibration
2.3 Materials
2.4 Dimensions
2.5 Moment of inertia
2.6 Balance
2.7 Maximum speed
2.8 Locking pull
2.9 Air feed openings
2.10 Air filter
2.11 Air flow
2.12 Thermal time constant
2.13 Operational earthing
2.14 Physical characteristics of magnetic surfaces
3. Magnetic characteristics
3.1 Track and recording information
3.2 Conditions for magnetic test
3.3 Functional tests
Appendices
A. Recommended accelerated storage life test
B. Recommended procedure for testing vibration and
shock
C. Coating adhesion and abrasive wear
D. Measuring effective track width of test head
Tables
1. Head orientation
2. Nominal track positions
2A. Millimetre values
2B. Inch values
Figures
1. Disk pack with top and bottom covers
2. Disk pack without covers
3. Cross section of the hub (simplified)
4. Enlarged cross section of the lower end of the
spindle
5. The sector disk (top view)
6. Enlarged cross section of the disk pack (simplified)
7. Enlarged detail of the edge of a disk
8. Air flow test configuration
9. Geometry of head disk system
10. Track index
11. Write current waveform
12. Adhesion test
13. Abrasive wear resistance test
14. Track width
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