Difference between revisions of "RL01/02 disk drive"

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(Add a bunch of data)
(Add a few more data items, note brushes on early units)
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| average seek = 55 msec
 
| average seek = 55 msec
 
| maximum seek = 100 msec
 
| maximum seek = 100 msec
 +
| head switch = 8 msec (maximum)
 
| surfaces = 2
 
| surfaces = 2
 
| tracks = 256
 
| tracks = 256
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| density = 3725 bpi (maximum)
 
| density = 3725 bpi (maximum)
 
| recording method = [[Modified Frequence Modulation]] (MFM)
 
| recording method = [[Modified Frequence Modulation]] (MFM)
 +
| start time = 40 seconds
 +
| stop time = 30 seconds
 
| physical size = 19" W x 10-1/2" H x 25" L
 
| physical size = 19" W x 10-1/2" H x 25" L
 
| weight = 55 pounds
 
| weight = 55 pounds
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[[Image:rl01drive.jpg|150px|thumb|left|RL01 drive]]
 
[[Image:rl01drive.jpg|150px|thumb|left|RL01 drive]]
 +
 +
Early versions of the drive included a set of brushes that swing out over the [[platter]] on start-up; these were deleted in later versions.
  
 
The [[QBUS]] controllers are the [[RLV11]] and [[RLV12]], the latter being the [[QBUS|Q22]] version.
 
The [[QBUS]] controllers are the [[RLV11]] and [[RLV12]], the latter being the [[QBUS|Q22]] version.

Revision as of 14:08, 5 October 2017


RL01
Manufacturer: Digital Equipment Corporation
Drive Controller(s): RL11 (UNIBUS)
Capacity: 5.2 Mbytes (formatted)
Transfer Rate: 512 Kbytes/sec
3.9 usec/word (peak)
Average Access Time: 67.5 msec
Revolutions per Minute: 2400
1/2 Revolution Time: 12.5 msec
One Track Seek Time: 15 msec
Average Seek Time: 55 msec
Maximum Seek Time: 100 msec
Head Switching Time: 8 msec (maximum)
Total Surfaces: 2
Tracks per Surface: 256
Sectors per Track: 40
Words per Sector: 128
Tracks per Inch: 125
Density: 3725 bpi (maximum)
Recording Method: Modified Frequence Modulation (MFM)
Start Time: 40 seconds
Stop Time: 30 seconds
Physical Size: 19" W x 10-1/2" H x 25" L
Weight: 55 pounds
Power Consumption: 160W (running); 550 VA (starting)


An RL01

The RL01 is a 5MiB, single platter, removable pack disk drive introduced in 1976 by Digital Equipment Corporation. It used an IBM 5440 type pack, as used on the IBM System/3.

To keep the heads properly aligned on the tracks, it used a servo system driven by servo data written on the pack (along with sector headers) at the factory; packs cannnot be low-level re-formatted in the field.

RL01 drive

Early versions of the drive included a set of brushes that swing out over the platter on start-up; these were deleted in later versions.

The QBUS controllers are the RLV11 and RLV12, the latter being the Q22 version.

The RL02 is a higher density version, with twice as many tracks.