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    DEC disk history
    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
    
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