http://www.ultimate.com/phil/pdp10/dec.disks

DEC disk history
Started 1/94 -pb
Phil Budne <phil at ultimate.com>

$Id: dec.disks,v 1.31 2006/01/15 21:40:10 phil Exp $

The focus is on disks sold for use on DEC systems (whether
manufactured by DEC or not) not general market peripherals
(ie; the DSP SCSI line) manufactured by DEC.

Capacity is approx, (1K=1024 1M=1024K) some formatted, some unformatted
Geometry is (usually) physical (counts alternate sec & cyl)
	~ on cylinder counts means average (zone bit recorded disk)

Transfer rates are (usually) avg sustainted rates to/from media.
	1K=1000, 1M=1000K, b=bits, B=8-bit bytes.

All hard disks 3600 rpm unless noted

Wanted:
	corrections & additions!!
	seek times (avg/min/max)
	rotational latency
	transfer rate
	origal mfgr & designation for non-dec disks
	interface type (ie; Massbus, MSCP) or controller type
	year of introduction (dec or orig mfgr)
	encoding?? bpi??

Old interfaces (removable unless noted)
=======================================

disk	cap.	sec/trk	trk/cyl	cyl	notes
			(surf)

================ VAX730 IDC

R80	121M	31	14	559	dec built; winchester; SMD interface
					(RM80 with SMD/Massbus converter)

================ via PDP-11 RK-11, PDP-8 RK8

RK01	?	?	?	?	[on RK8] mfr: IOMEC (also sold as HP2870A)
					100TPI
RK02	1.2M	12*	2	203	Diablo model 30 low density (256B sect)
					avg seek: 70ms (15ms min)
					1500 rpm; avg rot delay: 20ms
					xfer: 22.2us/word
					1100 BPI max
					1-of-n select
RK03	2.5M	12*	2	203	Diablo model 30 high density (512B sect)
					avg seek: 70ms (15ms min)
					1500 rpm; avg rot delay: 20ms
					xfer: 11.1us/word
					2200 BPI max
					1-of-n select
RK04	1.2M	12*	2	203	low density (256B sectors)
					binary select
RK05(J)	2.5M	12*	2	203	1500rpm; RK03 cartridge;
					RK8 max xfer 1.44Mb/s (8.32us/wd 1.1??)
					seek: 50ms/10ms/85ms
					binary select
RK05F	5M	12*	2	203	1500rpm; fixed rk05; 2xRK05 to s/w

*16 sec/trk on pdp-8 (192 words/sector?)

================ via RK611 (Unibus)

RK06	13M	22	3	411	2400rpm; dec built
RK07	27M	22	3	823	2400rpm; dec built;
					xfer 538KB/s; lat=12.5ms
					seek: 36.5ms avg, 8.5ms min
					avg access 49ms
================

RL01	5.2M	40	2	256	2400rpm; 256B/sect; dec built; pack
					xfer 512KB/s; lat=12.5ms
					seek (ms) 55avg/15min/100max
					3725 BPI; 125 TPI
RL02	10M	40	2	512	2400rpm; 512B/sect; dec built; pack
					xfer 512KB/s; lat=12.5ms
					seek (ms) 55avg/15min/100max
					3725 BPI; 250 TPI

================ via PDP-10 RA10

RB10	20-100M	11	varied		"Giant Bryant" disk
					(aka "MD10" Moby Disk???)
					1200rpm? av seek 110ms?
					6 to 20 platters; each w/ 2 arms
					20,971,520 to 104,857,600 36bit words
					xfer 22.us to 72us/w
================ via PDP-10 RC10;

RD10	2.5M	20	2	100	Burroughs disk
					1800(1735)rpm; 32*36b/sect
					fixed head; lat=17.6ms; xfer=2.7Mb/s
					(76000W/S; 13us/W)
					total of 512,000 36-bit words
					(4000 128-word blocks)
					200 tracks of 80 32W "segments"

RM10B	2.07M	30	1	90	Bryant drum; 64*36b/sect; xfer 7.9Mb/s
					@60Hz: 3450rpm, lat8.8ms
					@50Hz: 2870rpm, lat10.6ms
					total of 345,600 36-bit words
					(2700 128-word blocks)
					Drum surface was conical, and mounted
					vertically.

================ fixed head

RF/RS11	512K	--	1	128	1800rpm; fixed head

RS08	256KW	--	1	128	PDP-8 fixed head disk (RF08 ctrlr)
					128 fixed heads (1/track)
					3(+3 spare) timing tracks 
					word addressable
					2048 words/track; 1100 BPI max
					@60Hz: xfer 16us/wd
						access 16.9ms/250us/33.6ms
					@50Hz: xfer 19.2us/wd
						access 20.3ms/320us/40.3ms
					max density 1100BPI, NRZI recording

DF32	32KW	--	1	16	PDP-8 fixed head disk (13 bit words)
					word addressable; 2KW tracks
					@60Hz: xfer 32us/wd, avg access 16.67ms
					@50Hz: xfer 39us/wd, avg access 20ms
					max density 1100BPI, NRZI recording
					10" rack 10.5" high

					Upto 3 DS32 slaves can be chained.

================ via PDP-10 RP10; PDP-11 RP-11; PDP-8 RP08

RP01	5M	5	10	203	2400rpm; Memorex ("Mark I"?)
					pack [never released]
					seek (ms) 50avg/20min/80max; lat13.7ms
					xfer=837Kb/s
RP02	20M	10	20	203	2400rpm; Memorex 660 (Mark IV); pack
					seek (ms) 50avg/20min/80max; lat13.1ms
					xfer=1.8Mb/s. $25k c. 1969
RP03	40M	10	20	400	2400rpm; Memorex (Mark VI); pack

================ via PDP-6 270

5022	5.76MW	4/7	16	128/128	Data Products disk
					inner and outer zones
					each arm has heads for both
					128 (36 bit) word sectors

Massbus
=======
disk	cap.	sec/trk	trk/cyl	cyl	notes

RP04	83M	22	19	411	pack; ISS-Sperry Univac (8430?)
					3500rpm? av seek 27ms?

RP05	83M	22	19	411	pack; Memorex; drive looks like RP06
					field upgradable to RP06

RP06	176M	22	19	815	pack; ISS/Memorex 677 "Mark XVI"
					("Merlin"?) (clone of IBM 3330-II?)
					avg access 38.3ms; avg lat 8.3ms
					seek 30ms (avg), 10ms (min)
					xfer=825KB/s
					3600rpm

RP07	504M	50(30?)	32	630	ISS/Sperry Univac; winchester
					seek 23ms (avg) 3633 rpm?
					xfer=2.3MB/s (36-bit)/ 1.3MB/s (32-bit)

RP20	929M	24(25?)	30	1119(750?) two fixed spindles (on DX20?)
					seek 25ms (avg); xfer=1.3MB/s
					3500 rpm? (840000 128*36b blocks)
					Memorex 3652??
					dual Memorex 3650 (IBM 3350 clone)

RS03	512K	64	1	64	fixed head; 128B/sector
RS04/5	1M	64(32?)	1	64	fixed head; 256B/sector
					6ms access; spiral read
					32 blks/trk 2048 blks/cyl?
					3600rpm

RM02	67M	32	5	823	pack; CDC 9762; 2400 rpm
					xfer=6.4Mb/s (806KB/s); avg acc 42.5ms
					seek 30ms (avg), 6ms (min)
					avg latency 12.5ms
RM03	67M	32	5	823	pack; CDC 9762; 3600 rpm
					xfer=9.6Mb/s (1.2MB/s); avg acc 38.3ms
					seek 30ms (avg), 6ms (min)
					avg latency 8.3ms

RM05	256M	32	19	823	pack; CDC 9766
RM06	?

RM80	124M	32	14	559	winchester (RA80 HDA)
					xfer=9.6Mb/s (1.2MB/s)
					avg access 33.3ms; avg lat 8.3
					seek 25ms (avg), 6ms (min)
					3600RPM

ML11A	varies	-	-	-	solid-state (ram) disk; 2MB/s xfer
					1-31 arrays of 512 or 2048 blocks ea

MSCP/SDI
========
disk	cap.	sec/trk	trk/cyl	cyl	notes

RA60	205M	42	4	2382	pack; seek 42 ms (avg);
					xfer=2.1MB/s (1.98?)
					3500 rpm?? 5 platters?

=== 5.25" FH?

RA70	280M	33	11	1507	
RA71	684M	51	14	1915
RA72	1G	51	20	1915
RA73	2G	70	21	2667

=== 19"

RA80	124M	31	14	546 	dec; winchester; 3500 rpm?
RA81	446M	51	14	1248	dec; winchester; 3500 rpm?
					seek 28 ms (avg); xfer=2.3MB/s
RA82	608M	57	15	1423	dec; winchester

RA90	1.2G	69	13	2649
RA92	1.5G	69	13	3279

RC25	26M*2	42	4	302	"LESI" (Low End Storage Interconnect)
					1 fixed, 1 removable; CDC9457? ("Lark")
					Peak xfer 1.25 MB/s;
					Seek 10/35/55ms
					avg rotational latency: 10.5ms
					avg access: 45.5 ms

MSCP/DSSI
=========

RF30	143M	37	6	1320	5.25" HH
RF31	380M	50	8	1861	5.25" HH
RF35	852M				5.25" HH?
RF36	1.6G				5.25" HH?
RF71	390M	37	16	1320	5.25" FH
RF72	1G	50	21	1861	5.25" FH
RF73	2G				5.25" FH?
RF74	3.5G				5.25" FH?

=== ??

ESE20	120M	4	128	483	Solid state disk

Floppy
================================================================
disk	cap.	sec/trk	trk/cyl	cyl	notes

RX01	256K	26	1	77	8" SSSD (IBM soft-sectored)
					128B/sect; 360rpm
					xfer 250Kb/s; lat 83ms
					seek (ms) 405avg/30min/790max
RX02	512K	26	1	77	8" SSDD (on-standard)
					256B/sect; 360rpm
					xfer 488Kb/s (61KB/s); lat 83ms
					seek (ms) 154avg/6min
					avg access 262ms

RX03	1M	26	2	77	8" DSDD (non-standard) -- not released

RX22

RX23					3.5" SCSI
 high	1.4M	18	2	80
 double	720K	9	2	80
 single	360K	9	2	40

RX26					3.5" SCSI
 extra	2.8M	36	2	80
 high	1.4M	18	2	80
 double	720K	9	2	80	
 single	360K	9	2	40


RX33					5.25" Teac FD55-GFR-17U MFM?
 extra	1.2M	15	2	80
 high	720K	9	2	80	DSDD
 double	400K	10	1	80	SSDD (RX50 compat?)
 single	360K	9	2	40	DSSD

RX50	400K	10	1	80	5.25" single sided, dual drive
					FM encoding

MFM "ST506/412 interface" (on RQDX{1,2,3})
==========================================
disk	cap.	sec/trk	trk/cyl	cyl	notes

=== 5.25" FH
RD50	5M	17	4	153	Seagate ST506 seek 85/3?/??
RD51	10M	17	4	306	Seagate ST412 seek 85/16.6?/??
RD52	31M	18	7	480	Quantum 540 / ATASI 3046 (also Evotek?)
RD53	71M	18	8	1024?	Microp 1325 (or 1335) w/ jumper at J7
RD54	156M	17	15	1225	Maxtor XT-2190D

=== 5.25" HH
RD31	20M	17	4	615	ST225 seek (ms) 65/20/150
RD32	40M	17	6	820	ST251(-1*) seek 40(28*)/8/70
					ST277R(-1*) [MFM format] 40(28*)/8/70
RD33	71M				Microscience HH-1090 [Never released]

SMD disks popular on VAXen (Winchesters unless noted)
=====================================================
disk	cap.	sec/trk	trk/cyl	cyl	notes

A9300	248M	32	19	815	Ampex 9300; removable
A330	262M	32	16	1024	Ampex Capricorn 330

CDC9720	275M	48	10	1147
CDC9730	268M	32	10	823	removable
CDC9762	65M	32	5	823	removable; (also RM03) [phys 80M?]
CDC9766	256M	32	19	823	removable; (also RM05)
CDC9775	839M	32	40	843

M160	132M	32	10	823	Fujitsu 160
M2351	337M	46	20	842	Fujitsu Eagle 19"
M2351A	337M	48	20	842	Fujitsu Eagle 19"
M2351AF	337M	48	20	842	Fujitsu Eagle 19" w/ 3 fixed heads
M2361	549M	64	20	842	Fujitsu Super Eagle 19"
M2361A	549M	68	20	842	Fujitsu Super Eagle 19"

NEC800	800M	66	23	850
NEC2363	1G	64	27	1024

SCSI disks (Winchesters unless noted)
=====================================
disk	cap.	sec/trk	trk/cyl	cyl	notes

=== 5.25" FH

RZ55	325M				Micropolis 1578-15
					or maxtor xt-4380sb2?
RZ55L
RZ56	650M	54	15	1632	Micropolis 1588-15
RZ56L
RZ57	1.01G	71	15	1925	Micropolis 1598-15
RZ57I
RZ57L
RZ58	1.3G	85~	15	2117	5400rpm? Micropolis 1908?
RZ59	8.9G	193	18	5111

=== 5.25" FH?

RZ72
RZ73	2.0G	71	21	2621
RZ74	3.57G	67~	25	4165

=== 3.5" HH?

RZ22	51M	33	4	776	Conner CP350
RZ23	102M	33	8	776	Conner CP3100-1
RZ23L	118M	39~	4	1524
RZ24	205M	38	8	1348	Conner CP3200; 3500rpm?
RZ24L	240M	66~	8	1818	Quantum LPS-240S?
RZ25	416M	62	9	1492
RZ25L	523M	79~	8	1891
RZ26	1.05G	57	14	2570	5400rpm?
RZ27	1.6G	143~	16	1366
RZ28	2.1G	99~	16	2595	DEC manufactured
RZ28B	2.1G	82~	19	2626	Seagate ST12400N; 5411 rpm; seek 10/2/22
RZ29	4.2G	113~	20	3720	Quantum?

================ 5" HH?

RZ31
RZ33	??
RZ35	832M	57	14	2086

================ 5" FH??

RZ55	332M
RZ56	635M
RZ57	1G
RZ58	1.3G

================ 5" FH

RZ73	2G
RZ74	3.57G

================ CD-ROM (IDE/ATAPI)

RRD20?					PHILLIPS 2X IDE/ATAPI CDROM
RRD32?					32X ATAPI CD-ROM
RRD37					Toshiba XM-5201B

================ CD-ROM (SCSI)

RRD40					LMS CM 210 (no audio)
RRD42					1X Sony CDU-541
RRD43					2X Toshiba XM-4101B
RRD44					2X Toshiba XM-3401B "high performance"
RRD45					4X Toshiba XM-5401B
RRD46					12x Toshiba XM-6302B (or XM-5701B?)
RRD47					32x Toshiba XM-6201B
RRD50					Philips/LMSI CM100 (no audio)

================ Optical WORM

RWZ01	288M	31	1	18751	Erasable Optical 5.25"
					(Sony) EDM-1DA0/1DA1/650/600

RWZ21					WORM 3.5" (MO)

RV20	6GB?				Optical WORM 12"
RSV20					Optical WORM
RV60					12"
RV64					Jukebox (RV20 based)

RWZ52	1.2G				5.25"; rewritable; 600MB/side
					HC: acc 36ms; r 1.6MB/s; w 0.53MB/s
					LC: acc 38ms; r 1.0MB/s; w 0.33MB/s

RVZ72	6.55G				tabletop 12" write once; SCSI
					access 600ms; read 900KB/s; w 400 KB/s
RV720	78GB				deskside jukebox w/ 1 drive, 12 disks
RV730ZB	438GB				datacenter jukebox w/ 2 drives; 67 d.
RV730ZD	308GB				datacenter jukebox w/ 4 drives; 47 d.
					

Decimage Express v2?			LMS 5.25"/12" WORM 

Solid-state disks (SCSI?)
=========================

"disk"	cap.	sec/trk	trk/cyl	cyl	notes

EZ51	104M	33	9	776
EZ54	418M	62	10	1492
EZ58	835M	20	10	8353

