612:
1457:
279:
1467:
138:
258:), the 1.22 megabyte RK02, of which very few were shipped, and the 2.45 megabyte RK03 (Diablo Model 31). These were interface compatible with the RK05; RK03 and RK05 disks could be interchanged as well. The RK04 was DEC's counterpart to the RK02, for low-density storage of 600 Kwords, and the RK05 was DEC's counterpart of the high-density RK03, storing 1.2 Mwords.
1477:
33:
273:
A non-removable RK05F was also produced. By "fixing" the otherwise removable cartridge in place, it was able to avoid the cartridge-to-cartridge compatibility problems that limited the capacity of the ordinary RK05. As a result, it could operate at twice the normal track density, doubling the
121:
systems to which it could be attached had numerous operating systems for each computer architecture, so by changing disk pack another operating system could also be booted. Although the 14-inch cartridge could not fit in a shirt pocket, unlike
188:
for feedback. The track density was 100 tracks-per-inch. The bit density along the track was about 2200 bits-per-inch. Discrete electronics computed the velocity profile for seeks commanded by the controller. An absolute filter
559:
230:; it supported up to four RK05 drives. The RK05 disk had more than 4096 sectors and so could not be addressed completely by a single PDP-8 12-bit word. To accommodate this, the
114:-style front-loading removable disk cartridge. The cartridge permitted users to have relatively unlimited off-line storage and to have very fast access to such data.
129:
Although a minimal PDP-8/A came with only one drive, most computers were configured with at least one additional storage device; some systems had four drives.
552:
223:; it allowed the connection of up to eight RK05 drives. Seeks could be overlapped among the drives but only one drive at a time could transfer data.
1480:
1470:
545:
267:
The RK05E was a late version of the standard-density RK05 drive. It contained many reliability enhancements compared to the earlier versions.
1168:
600:
209:
430:
408:
1242:
1247:
1188:
1135:
1382:
1002:
1272:
568:
142:
103:
44:
527:
1362:
1069:
620:
208:, the drive stored 1.6 megawords (so roughly the same bit capacity, albeit formatted differently). Multiple drives were
1501:
1420:
1367:
1150:
1112:
957:
1397:
1183:
515:
1511:
1431:
118:
1094:
386:
173:
611:
1415:
1387:
952:
700:
695:
336:
1506:
1460:
627:
434:
1377:
1145:
1049:
193:) provided pressurized air to the cartridge, excluding most contaminants that would otherwise cause
1237:
982:
636:
251:
1104:
185:
369:
1214:
797:
278:
1252:
937:
307:
The RK05 was not a "rebadged" product, i.e. another manufacturer's product with a DEC label.
166:
1160:
588:
531:
1257:
1124:
1118:
678:
510:
1495:
1302:
488:
471:
448:
177:
99:
1297:
1193:
1140:
1039:
154:
270:
The RK05J was the final version of the standard-density RK05 removable pack drive.
204:, the drive stored roughly 1.2 megawords. When used on 12-bit systems such as the
762:
757:
752:
746:
742:
735:
730:
725:
594:
537:
157:, the drive was competitive at the time. The cartridge contained a single, 14"
1355:
1130:
194:
181:
162:
137:
52:
1328:
1232:
1203:
1089:
783:
778:
717:
582:
158:
150:
56:
250:
Prior to the introduction of DEC's own drives, DEC resold two drives from
1339:
1079:
1074:
1034:
813:
673:
655:
650:
234:
operating system split each drive into two logical volumes, for example,
111:
107:
68:
64:
59:
can hold about 2.5 megabytes of data. Introduced 1972, it is similar to
1392:
1277:
1227:
1222:
1173:
1059:
1019:
1014:
962:
170:
123:
505:
1425:
1345:
1333:
1198:
1029:
1024:
997:
992:
967:
909:
213:
201:
87:
83:
17:
410:
DIGITAL EQUIPMENT CORPORATION - Nineteen Fifty-Seven To The
Present
242:, representing the outermost and innermost cylinders of the drive.
1442:
1437:
1410:
1402:
1372:
1350:
1323:
1267:
1262:
1178:
1084:
1064:
1009:
987:
972:
947:
927:
921:
915:
903:
898:
893:
887:
882:
877:
871:
866:
861:
856:
851:
846:
841:
835:
277:
255:
205:
180:
maintained by the rotation of the disk. They were positioned by a
136:
79:
37:
31:
75:
drive, which has half the capacity of an RK05, was also offered.
1307:
1292:
1282:
977:
830:
825:
819:
807:
707:
688:
683:
231:
190:
126:, the RK05 provided personal, portable, and expandable storage.
541:
32:
665:
341:
60:
226:
The most-common 12-bit (Omnibus) controller was known as the
176:
were pressed towards the disk by spring arms, floating on an
337:"IBM Archives: IBM 1800 data acquisition and control system"
216:
cabling; a terminator was installed in the farthest drive.
291:
RK05-compatible non-DEC RK05s were produced and marketed.
27:
Disk drive for
Digital Equipment Corporation minicomputers
71:
disk pack, although the latter only held 1 megabyte. An
1316:
1212:
1159:
1103:
1048:
936:
796:
771:
716:
664:
635:
619:
575:
370:"RK11-C moving head disk driver controller manual"
36:An RK05 drive with a mounted disk pack containing
506:RK05 drive information compiled by David Gesswein
364:
362:
360:
219:The 16-bit (Unibus) controller was known as the
141:Drive head mechanism on an RK05 disk drive from
78:Systems on which it can be used include DEC's
553:
425:
423:
8:
403:
401:
399:
464:
462:
632:
610:
560:
546:
538:
200:When used on 16-bit systems such as the
67:, and uses a disk pack similar to IBM's
328:
300:
416:. Digital Equipment Corporation. 1975.
511:PDP-11 RK05 removable hard disk drive
7:
1476:
1169:Digital Storage Systems Interconnect
1243:Dynamically Redefined Character Set
274:capacity of the drive to about 5MB.
1189:Synchronous Backplane Interconnect
516:RK05 disk drive maintenance manual
25:
316:or even eight: DEC DATAsystem-535
1475:
1466:
1465:
1456:
1455:
1383:Maintenance Operations Protocol
486:"RK05-Compatible Unit Debuts".
475:. October 31, 1977. p. 61.
469:"PDP-11/60, RK05J and RK05F".
106:. It stored approximately 2.5
1:
1273:Mass Storage Control Protocol
569:Digital Equipment Corporation
149:Occupying 10.5 inches (6
143:Digital Equipment Corporation
45:Digital Equipment Corporation
1363:Digital Federal Credit Union
585:(founder and CEO, 1957–1992)
492:. June 19, 1978. p. 48.
212:from their controller using
165:in an epoxy binder. The two
1407:Sequence and Batch Language
1368:Dynamic debugging technique
375:. DEC. 1971. DEC-11-HRKA-D.
98:The RK05 was a moving head
1528:
1398:Record Management Services
1184:Standard Disk Interconnect
534: (archived 2022-08-14)
431:"Early PDP-11 Peripherals"
282:(removable) disk cartridge
1451:
1432:The Ultimate Entrepreneur
608:
528:Brief history of the RK05
153:) of space in a standard
110:on a 14", single-platter
1095:DIGITAL Command Language
1421:Systems Research Center
1416:System Reference Manual
1388:On-line Debugging Tool
283:
186:linear optical encoder
146:
102:drive manufactured by
41:
449:"Ken&Den picture"
281:
140:
35:
1378:Local Area Transport
1136:National Replacement
161:platter coated with
1238:Digital Linear Tape
597:(VP of engineering)
345:. November 30, 1964
254:(later acquired by
252:Diablo Data Systems
63:'s 1964-introduced
1502:1972 introductions
1461:Computers template
392:. DEC. April 1974.
284:
147:
42:
1489:
1488:
792:
791:
184:actuator using a
133:Technical details
16:(Redirected from
1519:
1512:Hard disk drives
1479:
1478:
1469:
1468:
1459:
1458:
1253:Flip-Chip module
1146:Special Graphics
633:
614:
603:(CEO, 1992–1998)
562:
555:
548:
539:
494:
493:
483:
477:
476:
466:
457:
456:
445:
439:
438:
437:on May 28, 2020.
433:. Archived from
427:
418:
417:
415:
405:
394:
393:
391:
383:
377:
376:
374:
366:
355:
354:
352:
350:
333:
317:
314:
308:
305:
174:read/write heads
55:whose removable
21:
1527:
1526:
1522:
1521:
1520:
1518:
1517:
1516:
1492:
1491:
1490:
1485:
1447:
1312:
1208:
1155:
1115:(Multinational)
1099:
1051:
1044:
939:
932:
799:
788:
767:
712:
660:
626:
622:
621:Instruction set
615:
606:
589:Harlan Anderson
571:
566:
532:Wayback Machine
524:
522:Further reading
502:
497:
485:
484:
480:
468:
467:
460:
453:Nokia Bell Labs
447:
446:
442:
429:
428:
421:
413:
407:
406:
397:
389:
387:"OS/8 Handbook"
385:
384:
380:
372:
368:
367:
358:
348:
346:
335:
334:
330:
326:
321:
320:
315:
311:
306:
302:
297:
289:
264:
248:
135:
96:
28:
23:
22:
15:
12:
11:
5:
1525:
1523:
1515:
1514:
1509:
1504:
1494:
1493:
1487:
1486:
1484:
1483:
1473:
1463:
1452:
1449:
1448:
1446:
1445:
1440:
1435:
1428:
1423:
1418:
1413:
1408:
1405:
1400:
1395:
1390:
1385:
1380:
1375:
1370:
1365:
1360:
1359:
1358:
1348:
1343:
1336:
1331:
1326:
1320:
1318:
1317:Related topics
1314:
1313:
1311:
1310:
1305:
1300:
1295:
1290:
1285:
1280:
1275:
1270:
1265:
1260:
1255:
1250:
1245:
1240:
1235:
1230:
1225:
1219:
1217:
1210:
1209:
1207:
1206:
1201:
1196:
1191:
1186:
1181:
1176:
1171:
1165:
1163:
1157:
1156:
1154:
1153:
1148:
1143:
1138:
1133:
1128:
1125:Code page 1288
1122:
1119:Code page 1287
1116:
1113:Code page 1100
1109:
1107:
1105:Character sets
1101:
1100:
1098:
1097:
1092:
1087:
1082:
1077:
1072:
1067:
1062:
1056:
1054:
1046:
1045:
1043:
1042:
1037:
1032:
1027:
1022:
1017:
1012:
1007:
1006:
1005:
995:
990:
985:
980:
975:
970:
965:
960:
955:
950:
944:
942:
934:
933:
931:
930:
925:
919:
913:
907:
901:
896:
891:
885:
880:
875:
869:
864:
859:
854:
849:
844:
839:
833:
828:
823:
817:
811:
804:
802:
794:
793:
790:
789:
787:
786:
781:
775:
773:
769:
768:
766:
765:
760:
755:
750:
740:
739:
738:
733:
722:
720:
714:
713:
711:
710:
705:
704:
703:
693:
692:
691:
681:
679:MicroVAX 78032
676:
670:
668:
662:
661:
659:
658:
653:
648:
645:
641:
639:
630:
617:
616:
609:
607:
605:
604:
598:
592:
586:
579:
577:
573:
572:
567:
565:
564:
557:
550:
542:
536:
535:
523:
520:
519:
518:
513:
508:
501:
500:External links
498:
496:
495:
478:
458:
440:
419:
395:
378:
356:
327:
325:
322:
319:
318:
309:
299:
298:
296:
293:
288:
285:
276:
275:
271:
268:
263:
260:
247:
244:
134:
131:
95:
92:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
1524:
1513:
1510:
1508:
1505:
1503:
1500:
1499:
1497:
1482:
1474:
1472:
1464:
1462:
1454:
1453:
1450:
1444:
1441:
1439:
1436:
1434:
1433:
1429:
1427:
1424:
1422:
1419:
1417:
1414:
1412:
1409:
1406:
1404:
1401:
1399:
1396:
1394:
1391:
1389:
1386:
1384:
1381:
1379:
1376:
1374:
1371:
1369:
1366:
1364:
1361:
1357:
1354:
1353:
1352:
1349:
1347:
1344:
1342:
1341:
1337:
1335:
1332:
1330:
1327:
1325:
1322:
1321:
1319:
1315:
1309:
1306:
1304:
1303:System Module
1301:
1299:
1296:
1294:
1291:
1289:
1286:
1284:
1281:
1279:
1276:
1274:
1271:
1269:
1266:
1264:
1261:
1259:
1256:
1254:
1251:
1249:
1246:
1244:
1241:
1239:
1236:
1234:
1231:
1229:
1226:
1224:
1221:
1220:
1218:
1216:
1211:
1205:
1202:
1200:
1197:
1195:
1192:
1190:
1187:
1185:
1182:
1180:
1177:
1175:
1172:
1170:
1167:
1166:
1164:
1162:
1161:Bus standards
1158:
1152:
1149:
1147:
1144:
1142:
1139:
1137:
1134:
1132:
1129:
1126:
1123:
1120:
1117:
1114:
1111:
1110:
1108:
1106:
1102:
1096:
1093:
1091:
1088:
1086:
1083:
1081:
1078:
1076:
1073:
1071:
1068:
1066:
1063:
1061:
1058:
1057:
1055:
1053:
1047:
1041:
1038:
1036:
1033:
1031:
1028:
1026:
1023:
1021:
1018:
1016:
1013:
1011:
1008:
1004:
1001:
1000:
999:
996:
994:
991:
989:
986:
984:
981:
979:
976:
974:
971:
969:
966:
964:
961:
959:
956:
954:
951:
949:
946:
945:
943:
941:
935:
929:
926:
923:
920:
917:
914:
911:
908:
905:
902:
900:
897:
895:
892:
889:
886:
884:
881:
879:
876:
873:
870:
868:
865:
863:
860:
858:
855:
853:
850:
848:
845:
843:
840:
837:
834:
832:
829:
827:
824:
821:
818:
815:
812:
809:
806:
805:
803:
801:
795:
785:
782:
780:
777:
776:
774:
770:
764:
761:
759:
756:
754:
751:
748:
744:
741:
737:
734:
732:
729:
728:
727:
724:
723:
721:
719:
715:
709:
706:
702:
699:
698:
697:
694:
690:
687:
686:
685:
682:
680:
677:
675:
672:
671:
669:
667:
663:
657:
654:
652:
649:
646:
643:
642:
640:
638:
634:
631:
629:
624:
623:architectures
618:
613:
602:
601:Robert Palmer
599:
596:
593:
590:
587:
584:
581:
580:
578:
574:
570:
563:
558:
556:
551:
549:
544:
543:
540:
533:
529:
526:
525:
521:
517:
514:
512:
509:
507:
504:
503:
499:
491:
490:
489:Computerworld
482:
479:
474:
473:
472:Computerworld
465:
463:
459:
454:
450:
444:
441:
436:
432:
426:
424:
420:
412:
411:
404:
402:
400:
396:
388:
382:
379:
371:
365:
363:
361:
357:
344:
343:
338:
332:
329:
323:
313:
310:
304:
301:
294:
292:
286:
280:
272:
269:
266:
265:
261:
259:
257:
253:
245:
243:
241:
237:
233:
229:
224:
222:
217:
215:
211:
210:daisy chained
207:
203:
198:
196:
192:
187:
183:
179:
175:
172:
168:
164:
160:
156:
152:
144:
139:
132:
130:
127:
125:
120:
115:
113:
109:
105:
101:
100:magnetic disk
93:
91:
89:
85:
81:
76:
74:
70:
66:
62:
58:
54:
50:
46:
39:
34:
30:
19:
1507:DEC hardware
1430:
1338:
1298:Star coupler
1287:
1194:TURBOchannel
1040:Digital UNIX
591:(co-founder)
487:
481:
470:
452:
443:
435:the original
409:
381:
347:. Retrieved
340:
331:
312:
303:
290:
249:
246:Predecessors
239:
235:
227:
225:
220:
218:
199:
195:head crashes
155:19-inch rack
148:
128:
116:
97:
77:
72:
48:
43:
29:
1050:Programming
763:Alpha 21464
758:Alpha 21364
753:Alpha 21264
743:Alpha 21164
726:Alpha 21064
595:Gordon Bell
287:Compatibles
191:HEPA filter
178:air bearing
1496:Categories
1356:HP-Interex
779:MicroPRISM
628:processors
576:Key people
324:References
182:voice coil
163:iron oxide
53:disk drive
1329:AltaVista
1233:DECwriter
1204:VAXBI bus
1151:Technical
1127:(Turkish)
1090:VAX MACRO
1052:languages
938:Operating
820:VT50/VT52
800:terminals
784:StrongARM
583:Ken Olsen
57:disk pack
1471:Category
1340:CPU Wars
1258:Gold key
1215:hardware
1141:RADIX 50
1080:MACRO-11
1075:MACRO-10
798:Computer
349:July 20,
262:Variants
159:aluminum
112:IBM-2315
94:Overview
1481:Commons
1393:PALcode
1278:PALcode
1248:Firefly
1228:DECtape
1223:DECtalk
1174:Massbus
1121:(Greek)
1060:BASIC-8
1020:VAX/VMS
1015:TOPS-20
963:TOPS-10
940:systems
747:21164PC
530:at the
171:ceramic
167:ferrite
124:DECtape
1426:TD/SMP
1346:DECnet
1334:Compaq
1213:Other
1199:Unibus
1131:Hebrew
1030:Ultrix
1025:VAXELN
1010:DSM-11
998:RSX-11
993:RSTS/E
983:DOS-11
968:RSX-15
953:4K DMS
948:DECsys
924:(1994)
918:(1993)
912:(1990)
910:VT1000
906:(1990)
890:(1987)
874:(1983)
838:(1978)
822:(1975)
816:(1972)
810:(1970)
701:Mariah
644:LSI-11
637:PDP-11
214:Unibus
202:PDP-11
88:PDP-15
86:, and
84:PDP-11
1443:WPS-8
1438:VT640
1411:Sixel
1403:ReGIS
1373:FX!32
1351:DECUS
1324:AdvFS
1268:LK421
1263:LK201
1179:Q-Bus
1085:MUMPS
1070:FOCAL
1065:DIBOL
988:RT-11
973:TSS/8
928:VT525
922:VT520
916:VT510
904:VT420
899:VT340
894:VT330
888:VT320
883:VT241
878:VT240
872:VT220
867:VT180
862:VT131
857:VT105
852:VT103
847:VT102
842:VT101
836:VT100
772:Other
736:21068
731:21066
718:Alpha
696:Rigel
414:(PDF)
390:(PDF)
373:(PDF)
295:Notes
256:Xerox
206:PDP-8
80:PDP-8
51:is a
38:RT-11
1308:TU81
1293:RL02
1288:RK05
1283:RA90
1035:MICA
978:OS/8
831:VT62
826:VT55
814:GT40
808:VT05
708:NVAX
684:CVAX
674:V-11
656:J-11
651:T-11
647:F-11
351:2011
240:RKB0
238:and
236:RKA0
232:OS/8
228:RK8E
221:RK11
169:and
117:The
73:RK04
69:2315
65:2310
49:RK05
18:RK03
1003:IAS
958:COS
689:SOC
666:VAX
342:IBM
119:PDP
104:DEC
61:IBM
47:'s
1498::
461:^
451:.
422:^
398:^
359:^
339:.
197:.
108:MB
90:.
82:,
749:)
745:(
625:,
561:e
554:t
547:v
455:.
353:.
189:(
151:U
145:.
40:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
