Difference between revisions of "RA90 disk drive"
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* ''Disk Drive Technology Improvements in the RA90'', in [[Digital Technical Journal|DTJ]] [http://www.dtjcd.vmsresource.org.uk/pdfs/dtj_v01-08_feb1989.pdf Number 8, February 1989] (pp. 48-62) | * ''Disk Drive Technology Improvements in the RA90'', in [[Digital Technical Journal|DTJ]] [http://www.dtjcd.vmsresource.org.uk/pdfs/dtj_v01-08_feb1989.pdf Number 8, February 1989] (pp. 48-62) | ||
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[[Category: DEC Non-removable-media Disks]] | [[Category: DEC Non-removable-media Disks]] | ||
Latest revision as of 02:13, 31 August 2023
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
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)
