Difference between revisions of "RA60 Disk Drive"
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| − | [[ | + | {{Infobox Disk drive |
| + | | name = RA60 | ||
| + | | manufacturer = [[Digital Equipment Corporation]] | ||
| + | | year introduced = June, 1982 | ||
| + | | controller = [[Standard Disk Interconnect#SDI Family of DSA Products|all SDI controllers]] | ||
| + | | capacity = 205 Mbytes (16-bit mode, formatted)<br>208 Mbytes (18-bit mode, formatted) | ||
| + | | transfer rate = 1.3 Mbytes/sec | ||
| + | | average access time = 50.3 msec | ||
| + | | rpm = 3600 | ||
| + | | revolution time = 8.3 msec | ||
| + | | one track seek = 6.7 msec | ||
| + | | average seek = 41.7 msec | ||
| + | | maximum seek = 75 msec | ||
| + | | surfaces = 6 | ||
| + | | number of heads = 6 | ||
| + | | tracks = 1,588 | ||
| + | | sectors = 38 (18-bit word mode)<br>42 (16-bit word mode) | ||
| + | | bytes per sector = 512 (16-bit word mode)<br>576 (16-bit word mode) | ||
| + | | tracks per inch = 779 | ||
| + | | density = 9,668 | ||
| + | | start time = 60 secs (max) | ||
| + | | stop time = 40 secs (max) | ||
| + | | physical size = 26cm x 44cm x 85cm | ||
| + | | weight = 155 lbs (approx) | ||
| + | | power consumption = 780 watts | ||
| + | }} | ||
| − | + | [[Image:open ra60.jpg|thumb|200px|left|An open RA60]] | |
| − | + | The '''RA60 Disk Drive''' is a [[Digital Equipment Corporation|DEC]] [[Standard Disk Interconnect|SDI]] [[removable-pack disk]] drive, introduced in 1982; it could support either 16- or 18-bit words. It is the only removable-media drive in the RAxx group of drives; the others ([[RA70]], etc) are all [[non-removable-media disk]] drives. It is member of the [[Digital Storage Architecture]] family. | |
| − | [[Category: | + | It uses the RA60-P [[pack]], which has a five platters, with six data surfaces; the two end platters are purely protective. Track servo information is pre-recorded on the data surfaces; the servo information is recorded at manufacturing time. |
| + | |||
| + | The RA60 can also be connected in a dual-[[hardware port|port]] arrangement, permitting its use by two [[device controller|controllers]]. | ||
| + | |||
| + | Quote from the combined DEC RA60/RA80/RA81 1982 sales brochure: | ||
| + | |||
| + | ''The RA60 is the industry's highest capacity and lowest price-per-megabyte rack mounted, removable media disk. With 205 megabytes of user formatted capacity, 615 megabytes are available in a 42-inch high cabinet - 50% more than any other removable media product. The RA60 provides 205 megabytes of removable media flexibility for $15,000.'' | ||
| + | |||
| + | Some DEC marketing material refers to the RA60 as a 'Winchester' drive; strictly speaking, this is not completely accurate. It does use some aspects of Winchester drives, such as the use of pre-recorded servo information, but it does not have a sealed HDA, which many regard as the key innovation in Winchester drives. | ||
| + | |||
| + | ==4.3 BSD disktab== | ||
| + | <pre> | ||
| + | ra60|RA60|DEC RA60 Removable:\ | ||
| + | :ty=removable:ns#42:nt#4:nc#2382:\ | ||
| + | :pa#15884:ba#8192:fa#1024:\ | ||
| + | :pb#33440:pc#400176:\ | ||
| + | :pg#82080:bg#4096:fg#512:\ | ||
| + | :ph#268772:bh#4096:fh#1024: | ||
| + | </pre> | ||
| + | |||
| + | ==Further reading== | ||
| + | |||
| + | * ''RA60 Disk Drive User Guide'' (EK-0RA60-UG-001 - not available online) | ||
| + | * ''RA60 Disk Drive Service Manual'' (EK-0RA60-SV-002 - not available online) | ||
| + | |||
| + | ==External links== | ||
| + | |||
| + | * [http://bitsavers.org/pdf/dec/disc/ra60/ ra60] - documentation at [[Bitsavers]] | ||
| + | ** [http://bitsavers.org/pdf/dec/disc/ra60/EK-0RA60-SV-001_May83.pdf RA60 Disk Drive Service Manual] (EK-0RA60-SV-001l | ||
| + | * [http://bitsavers.org/pdf/dec/brochures/DEC-RA60-205MB-RemovableMediaDiskDrive.pdf RA60 205-Mbyte Removable-Media Disk Drive] - brochure | ||
| + | * [http://bitsavers.org/pdf/dec/disc/brochure/RA60_RA80_And_RA81_Disk_Drives_Brochure_Aug82.pdf The RA60, RA80 and RA81 Disk Drives and The Digital Storage Architecture] - another brochure | ||
| + | * [http://bitsavers.org/pdf/dec/brochures/DEC-RA-FamilyOfWinchesterDiskDrives.pdf RA Family Of Winchester Disk Drives] - and one more | ||
| + | * [https://manx-docs.org/collections/hcps/m880btc.pdf RA60 Maintenance Guide] (AA-M88OB-TC) | ||
| + | * [https://www.computerhistory.org/collections/catalog/102733609 DEC RA60 disk drives] | ||
| + | |||
| + | [[Category: SDI Disk Drives]] | ||
| + | [[Category: DEC Removable-pack Disks]] | ||
Latest revision as of 10:36, 31 August 2023
| RA60 | |
| Manufacturer: | Digital Equipment Corporation |
|---|---|
| Year Introduced: | June, 1982 |
| Drive Controller(s): | all SDI controllers |
| Capacity: | 205 Mbytes (16-bit mode, formatted) 208 Mbytes (18-bit mode, formatted) |
| Transfer Rate: | 1.3 Mbytes/sec |
| Average Access Time: | 50.3 msec |
| Revolutions per Minute: | 3600 |
| 1/2 Revolution Time: | 8.3 msec |
| One Track Seek Time: | 6.7 msec |
| Average Seek Time: | 41.7 msec |
| Maximum Seek Time: | 75 msec |
| Total Surfaces: | 6 |
| Number of Heads: | 6 |
| Tracks per Surface: | 1,588 |
| Sectors per Track: | 38 (18-bit word mode) 42 (16-bit word mode) |
| Bytes per Sector: | 512 (16-bit word mode) 576 (16-bit word mode) |
| Tracks per Inch: | 779 |
| Density: | 9,668 |
| Start Time: | 60 secs (max) |
| Stop Time: | 40 secs (max) |
| Physical Size: | 26cm x 44cm x 85cm |
| Weight: | 155 lbs (approx) |
| Power Consumption: | 780 watts |
The RA60 Disk Drive is a DEC SDI removable-pack disk drive, introduced in 1982; it could support either 16- or 18-bit words. It is the only removable-media drive in the RAxx group of drives; the others (RA70, etc) are all non-removable-media disk drives. It is member of the Digital Storage Architecture family.
It uses the RA60-P pack, which has a five platters, with six data surfaces; the two end platters are purely protective. Track servo information is pre-recorded on the data surfaces; the servo information is recorded at manufacturing time.
The RA60 can also be connected in a dual-port arrangement, permitting its use by two controllers.
Quote from the combined DEC RA60/RA80/RA81 1982 sales brochure:
The RA60 is the industry's highest capacity and lowest price-per-megabyte rack mounted, removable media disk. With 205 megabytes of user formatted capacity, 615 megabytes are available in a 42-inch high cabinet - 50% more than any other removable media product. The RA60 provides 205 megabytes of removable media flexibility for $15,000.
Some DEC marketing material refers to the RA60 as a 'Winchester' drive; strictly speaking, this is not completely accurate. It does use some aspects of Winchester drives, such as the use of pre-recorded servo information, but it does not have a sealed HDA, which many regard as the key innovation in Winchester drives.
4.3 BSD disktab
ra60|RA60|DEC RA60 Removable:\ :ty=removable:ns#42:nt#4:nc#2382:\ :pa#15884:ba#8192:fa#1024:\ :pb#33440:pc#400176:\ :pg#82080:bg#4096:fg#512:\ :ph#268772:bh#4096:fh#1024:
Further reading
- RA60 Disk Drive User Guide (EK-0RA60-UG-001 - not available online)
- RA60 Disk Drive Service Manual (EK-0RA60-SV-002 - not available online)
External links
- ra60 - documentation at Bitsavers
- RA60 Disk Drive Service Manual (EK-0RA60-SV-001l
- RA60 205-Mbyte Removable-Media Disk Drive - brochure
- The RA60, RA80 and RA81 Disk Drives and The Digital Storage Architecture - another brochure
- RA Family Of Winchester Disk Drives - and one more
- RA60 Maintenance Guide (AA-M88OB-TC)
- DEC RA60 disk drives
