View source for RK02/03 disk drive

{{Infobox Disk drive 
| name = RK02/RK03
| manufacturer = [[Diablo Systems]]
| controller = [[RK8E]] ([[Omnibus]])<br>[[RK11|RK11-C]] ([[UNIBUS]])
| capacity = 1.22 Mbytes (RK02)<br>2.45 Mbytes (RK03)
| transfer rate = 22.2 μsec/word (RK02-RK11)<br>11.1 μsec/word (RK03-RK11)
| average access time = 70 msec
| rpm = 1500
| revolution time = 20 msec
| one track seek = 15 msec
| average seek = 70 msec
| aaximum seek = 135 msec
| surfaces = 2
| tracks = 203 (nominally 200, plus 3 spares)
| sectors = 16 (RK8E)<br>12 (RK11)
| words per sector = 128 (RK02-RK11)<br>256 (RK03-RK11)
| tracks per inch = 100
| density = 1100 bpi (RK02)<br>2200 bpi (RK03)
| recording method = Double Frequency
| physical size = 19" W x 10.5" H x 26.0" L
| weight = 43 pounds (basic Diablo drive)
}}

[[Image:rk03.jpg|200px|thumb|left|RK03 drives]]

The '''RK02''' and '''RK03''' were moving-head removable-pack [[magnetic storage]] [[disk]] drives, sold by [[DEC]], but designed and manufactured by [[Diablo Systems]]. They were inspired by the IBM 2315 drive and pack.

The original RK02 (Diablo Model 30) was soon joined by the RK03 (Diablo Model 31), a double-density model which held twice as much data.

The pack contained a [[platter]] 14 inches in diameter, coated with iron oxide. Since the disk was hard [[sector]]ed, platters used in the PDP-8 were physically incompatible with those used in the PDP-11, although the drives themselves were completely identical for both.

They were replaced by the DEC-manufactured [[RK05]], which used the same packs. <!-- and could read packs written by the RK03. -->

==External links==

* [http://maben.homeip.net/static/s100/diablo/disks/Diablo%2081502A%20Model%2030%20disk%20drive.pdf Series 30 Disk Drives]
* [http://chmhdd.wikifoundry.com/page/Diablo+30+Series Diablo 30 Series] 

[[Category: DEC Early Disk Drives]]
[[Category: DEC Removable-pack Disks]]