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- RK05 abstract "The RK05 DECpack was a moving head magnetic disk drive manufactured by the Digital Equipment Corporation of Maynard, Massachusetts. It stored approximately 2.5 MB on a 14", single-platter IBM-2315-style front-loading removable disk cartridge. The cartridge permitted users to have relatively unlimited off-line storage and to have very fast access to such data. At the time DEC had numerous operating systems for each computer architecture so operating systems could also be changed quickly. The RK05 was the disk successor to DECtape for personal, portable, and expandable storage. While the smallest practical configuration was two drives, many systems had four or more drives.Occupying 10.5 inches (6U) of space in a standard 19-inch rack, the drive was competitive at the time. The cartridge contained a single, 14" aluminum platter coated with iron oxide in an epoxy binder. The two ferrite and ceramic read/write heads were pressed towards the disk by spring arms, floating on an air bearing maintained by the rotation of the disk. They were positioned by a voice coil actuator using a linear optical encoder for feedback. The track density was 100 tracks-per-inch. The bit density along the track was about 2200 bits-per-inch. Discrete electronics computed the velocity profile for seeks commanded by the controller. An absolute filter (HEPA filter) provided pressurized air to the cartridge, excluding most contaminants that would otherwise cause head crashes.When used on 16-bit systems such as the PDP-11, the drive stored roughly 1.2 megawords. When used on 12-bit systems such as the PDP-8, the drive stored 1.6 megawords (so roughly the same bit capacity, albeit formatted differently). Multiple drives were daisy chained from their controller using Unibus cabling; a terminator was installed in the farthest drive.The 16-bit (Unibus) controller was known as the RK11; it allowed the connection of up to eight RK05 drives. Seeks could be overlapped among the drives but only one drive at a time could transfer data.The most-common 12-bit (Omnibus) controller was known as the RK8E; it supported up to four RK05 drives. The RK05 disk had more than 4096 sectors and so could not be addressed completely by a single PDP-8 12-bit word. To accommodate this, the OS/8 operating system split each drive into two logical volumes, for example, RKA0 and RKB0, representing the outermost and innermost cylinders of the drive.".
- RK05 thumbnail RK05.jpg?width=300.
- RK05 wikiPageExternalLink rk05.shtml.
- RK05 wikiPageID "6502190".
- RK05 wikiPageLength "3880".
- RK05 wikiPageOutDegree "29".
- RK05 wikiPageRevisionID "611949827".
- RK05 wikiPageWikiLink 19-inch_rack.
- RK05 wikiPageWikiLink Aluminium.
- RK05 wikiPageWikiLink Category:DEC_hardware.
- RK05 wikiPageWikiLink Ceramic.
- RK05 wikiPageWikiLink DECtape.
- RK05 wikiPageWikiLink Daisy_chain_(electrical_engineering).
- RK05 wikiPageWikiLink Diablo_Data_Systems.
- RK05 wikiPageWikiLink Digital_Equipment_Corporation.
- RK05 wikiPageWikiLink Disk_read-and-write_head.
- RK05 wikiPageWikiLink Encoder.
- RK05 wikiPageWikiLink Ferrite_(magnet).
- RK05 wikiPageWikiLink Fluid_bearing.
- RK05 wikiPageWikiLink HEPA.
- RK05 wikiPageWikiLink Head_crash.
- RK05 wikiPageWikiLink IBM.
- RK05 wikiPageWikiLink Iron_oxide.
- RK05 wikiPageWikiLink Magnetic_disk.
- RK05 wikiPageWikiLink Magnetic_storage.
- RK05 wikiPageWikiLink Massachusetts.
- RK05 wikiPageWikiLink Maynard,_Massachusetts.
- RK05 wikiPageWikiLink Megabyte.
- RK05 wikiPageWikiLink 8.
- RK05 wikiPageWikiLink PDP-11.
- RK05 wikiPageWikiLink PDP-8.
- RK05 wikiPageWikiLink Rack_unit.
- RK05 wikiPageWikiLink Unibus.
- RK05 wikiPageWikiLink Voice_coil.
- RK05 wikiPageWikiLink Xerox.
- RK05 wikiPageWikiLink File:RK05.jpg.
- RK05 wikiPageWikiLink File:RK05_drive_head.jpg.
- RK05 wikiPageWikiLinkText "RK series".
- RK05 wikiPageWikiLinkText "RK05".
- RK05 hasPhotoCollection RK05.
- RK05 wikiPageUsesTemplate Template:Unreferenced.
- RK05 subject Category:DEC_hardware.
- RK05 type Article.
- RK05 type Article.
- RK05 comment "The RK05 DECpack was a moving head magnetic disk drive manufactured by the Digital Equipment Corporation of Maynard, Massachusetts. It stored approximately 2.5 MB on a 14", single-platter IBM-2315-style front-loading removable disk cartridge. The cartridge permitted users to have relatively unlimited off-line storage and to have very fast access to such data. At the time DEC had numerous operating systems for each computer architecture so operating systems could also be changed quickly.".
- RK05 label "RK05".
- RK05 sameAs m.0g7tvv.
- RK05 sameAs Q7276875.
- RK05 sameAs Q7276875.
- RK05 wasDerivedFrom RK05?oldid=611949827.
- RK05 depiction RK05.jpg.
- RK05 isPrimaryTopicOf RK05.