RA90 disk drive

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The RA90 disk drive was a 1.216 GB (formatted) Standard Disk Interconnect non-removable-media disk from DEC.

Specifications

2,649 User Cylinders
14 Heads (13 data + 1 servo)
69 Sectors (+ 1 spare)
2,376,153 User Blocks
19 ms Average Seek
8.33 ms Average Latency

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External links

RA90/RA92 Disk Drive User Guide (EK–ORA90–UG–002)
RA90/RA92 Disk Drive Service Manual (EK-ORA90-SV-003)
RA90/RA92/H9643 Cabinet Installation Guide (EK-RA90H-IN-002)
Disk Drive Technology Improvements in the RA90, in DTJ Number 8, February 1989 (pp. 48-62)

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