Difference between revisions of "RM02/03 disk drive"
From Computer History Wiki
(Combine into one page) |
(Add more info) |
||
| Line 1: | Line 1: | ||
| − | The '''RM02''' and '''RM03''' were | + | {{Infobox Disk drive |
| − | + | | name = RM02/RM03 | |
| − | {{stub}} | + | | manufacturer = [[Digital Equipment Corporation]] |
| + | | controller = [[RH10 MASSBUS controller|RH10]] ([[PDP-10]])<br>[[RH20 MASSBUS controller|RH20]] ([[KL10]])<br>[[RH11 MASSBUS controller|RH11]] ([[UNIBUS]])<br>[[RH70 MASSBUS controller|RH70]] ([[PDP-11/70]])<br>[[RH780 MASSBUS controller|RH780]] ([[VAX-11/780]])<br>[[RH750 MASSBUS controller|RH750]] ([[VAX-11/750]]) | ||
| + | | capacity = 67 Mbytes | ||
| + | | transfer rate = 2.48 μsec/word (RM02/16-bit)<br>2.79 μsec/word (RM02/18-bit)<br>1.65 μsec/word (RM03/16-bit)<br>1.86 μsec/word (RM03/18-bit)<br> | ||
| + | | average access time = 42.5 msec (RM02)<br>38.3 msec (RM03) | ||
| + | | rpm = 2400 (RM02)<br>3600 (RM03) | ||
| + | | revolution time = 25.9 msec (RM02)<br>17.3 msec (RM03) | ||
| + | | one track seek = 6 msec | ||
| + | | average seek = 30 msec | ||
| + | | maximum seek = 55 msec | ||
| + | | surfaces = 6 (5 data, 1 servo) | ||
| + | | tracks = 823<!-- (nominally 400 plus 6 spares; many systems used all 406, as reliability was high) --> | ||
| + | | sectors = 30 (18-bit words)<br>32 (16-bit words) | ||
| + | | words per sector = 256 | ||
| + | <!-- | tracks per inch = 100 --> | ||
| + | <!-- | density = 2200 bpi (maximum) --> | ||
| + | | recording method = [[Modified Frequency Modulation|MFM]] | ||
| + | | physical size = 33" W x 39" H x ??" L | ||
| + | | weight = 430 pounds | ||
| + | <!-- | power consumption = 660 VA per phase (running); 3300 VA per phase(starting) --> | ||
| + | }} | ||
| + | |||
| + | The '''RM02''' and '''RM03''' were [[MASSBUS]] multi-[[platter]] large moving-[[head]] [[disk]] [[pack]] [[drive]]s. They were effectively identical, except that the RM03 rotated faster (3600 RPM, versus 2400 RPM for the RM02). Both supported both 15-bit and 18-bit [[word]]s; user data is protected by a 32-bit [[error-correcting code|ECC]] per [[sector]]. | ||
| + | |||
| + | RM0x drives are dual-ported, allowing any drive to be attached to two different controllers. Generally a maximum of 8 drives were supported per [[device controller]]. | ||
| + | |||
| + | The RM02 provided 806 KB/s transfers; the RM03 had 1200 KB/s transfer. | ||
| + | |||
| + | {{semi-stub}} | ||
[[Category: MASSBUS Devices]] | [[Category: MASSBUS Devices]] | ||
[[Category: DEC Disk Drives]] | [[Category: DEC Disk Drives]] | ||
Revision as of 18:57, 3 November 2020
| RM02/RM03 | |
| Manufacturer: | Digital Equipment Corporation |
|---|---|
| Drive Controller(s): | RH10 (PDP-10) RH20 (KL10) RH11 (UNIBUS) RH70 (PDP-11/70) RH780 (VAX-11/780) RH750 (VAX-11/750) |
| Capacity: | 67 Mbytes |
| Transfer Rate: | 2.48 μsec/word (RM02/16-bit) 2.79 μsec/word (RM02/18-bit) 1.65 μsec/word (RM03/16-bit) 1.86 μsec/word (RM03/18-bit) |
| Average Access Time: | 42.5 msec (RM02) 38.3 msec (RM03) |
| Revolutions per Minute: | 2400 (RM02) 3600 (RM03) |
| 1/2 Revolution Time: | 25.9 msec (RM02) 17.3 msec (RM03) |
| One Track Seek Time: | 6 msec |
| Average Seek Time: | 30 msec |
| Maximum Seek Time: | 55 msec |
| Total Surfaces: | 6 (5 data, 1 servo) |
| Tracks per Surface: | 823 |
| Sectors per Track: | 30 (18-bit words) 32 (16-bit words) |
| Words per Sector: | 256 |
| Recording Method: | MFM |
| Physical Size: | 33" W x 39" H x ??" L |
| Weight: | 430 pounds |
The RM02 and RM03 were MASSBUS multi-platter large moving-head disk pack drives. They were effectively identical, except that the RM03 rotated faster (3600 RPM, versus 2400 RPM for the RM02). Both supported both 15-bit and 18-bit words; user data is protected by a 32-bit ECC per sector.
RM0x drives are dual-ported, allowing any drive to be attached to two different controllers. Generally a maximum of 8 drives were supported per device controller.
The RM02 provided 806 KB/s transfers; the RM03 had 1200 KB/s transfer.
