RS03/04 disk drive - Revision history

Jnc: New DEC disk cat system

2023-08-14T16:37:54Z

New DEC disk cat system

Jnc: +External links, CRC

2021-09-25T19:09:20Z

+External links, CRC

Jnc: Jnc moved page RS0x disk drive to RS03/04 disk drive without leaving a redirect: Better naming system

2020-10-29T15:26:45Z

Jnc moved page RS0x disk drive to RS03/04 disk drive without leaving a redirect: Better naming system

Jnc: +cat

2018-12-07T17:33:20Z

+cat

Jnc: Mention swapping use

2018-11-22T12:04:31Z

Mention swapping use

Jnc: Addnl info

2018-11-22T02:15:52Z

Addnl info

Jnc: An OK start

2018-11-21T18:26:50Z

An OK start

New page

{{Infobox Disk drive
| name = RS03/RS04
| manufacturer = [[Digital Equipment Corporation]]
| rpm = 3600 (60Hz)
| average access time = 8.5 msec (60Hz), 10.2 msec (50Hz)
| capacity = 512KB (RS03), 1024KB (RS04)
| surfaces = 1 (RS03), 2 (RS04)
| tracks = 64
| sectors = 64
| words per sector = 128 bytes (RS03), 256 bytes (RS04)
| media = 16" diameter nickel-cobalt plated surface
| transfer rate = 2 μsec/byte (RS03), μ1 sec/byte (RS04)
| density = xxx bpi (maximum)
| recording method = [[Modified Frequency Modulation‎|MFM]]
| physical size = 15-3/4" (high), 19" (width)
| weight = xxx lbs
| power consumption = 13A (starting), 4A (operating)
| controller = [[RH11 MASSBUS controller|RH11]] ([[UNIBUS]]), [[RH70 MASSBUS controller|RH70]], [[RH10 MASSBUS controller‎|RH10]]

|}}

The '''RS03''' and '''RS04 disk drives''' were [[MASSBUS]] fixed-platter [[fixed-head disk]] [[drive]]s. Their basic format was 18-[[bit]] [[word]]s (for use in [[PDP-10]] and [[PDP-15]] machines), but they couldbe used in [[PDP-11]]s, where they simply ignored two bits.

The RS04 doubled the capacity (and bit rate) of the RS03 by recording on both sides of the [[platter]]; alternate bits in each word came from alternate sides.

They could store up to 512KB of data in 128 byte blocks (RS03), or 1024KB of data in 256 byte blocks (RS04). They used xx fixed read/write [[head]]s for data, and yy heads to read timing/address [[track]]s (in two duplicated sets of 3, for reliability; switch-over from one set to another was manual).



{{semi-stub}}

[[Category: DEC Disk Drives]]

@@ Line 48: / Line 48: @@
 * [http://www.bitsavers.org/pdf/dec/disc/rs04/RS04_Engineering_Drawings_Jul73.pdf RS04 Engineering Drawings]
-[[Category: MASSBUS Devices]]
+[[Category: MASSBUS Disk Drives]]
-[[Category: DEC Disk Drives]]
+[[Category: DEC Fixed-head Disks]]

@@ Line 1: / Line 1: @@
 {{Infobox Disk drive
 | name = RS03/RS04
-| manufacturer = [[Digital Equipment Corporation]]
+| manufacturer = [[Digital Equipment Corporation|DEC]]
 | rpm = 3600 (60Hz)
 | average access time = 8.5 msec (60Hz), 10.2 msec  (50Hz)
@@ Line 11: / Line 11: @@
 | media = 16" diameter nickel-cobalt plated surface
 | transfer rate = 2 μsec/byte (RS03), μ1 sec/byte (RS04)
-| density = xxx bpi (maximum)
+<!-- | density = xxx bpi (maximum) -->
 | recording method = [[Modified Frequency Modulation‎|MFM]]
 | physical size = 15-3/4" (high), 19" (width), 26-1/4" (depth)
@@ Line 29: / Line 29: @@
 The '''RS03''' and '''RS04 disk drives''' were [[MASSBUS]] fixed-platter [[fixed-head disk]] [[drive]]s. Their basic format was 18-[[bit]] [[word]]s (for use in [[PDP-10]] and [[PDP-15]] machines), but they could be used in [[PDP-11]]s, where they simply ignored two bits.
-They attach to any MASSBUS controller, e.g. [[RH11 MASSBUS controller|RH11]] ([[UNIBUS]]), [[RH70 MASSBUS controller|RH70]], or [[RH10 MASSBUS controller‎|RH10]]. Up to 8 devices total can be attached to any MASSBUS controller.
+They attach to any MASSBUS controller, e.g. [[RH11 MASSBUS controller|RH11]] ([[UNIBUS]]), [[RH70 MASSBUS controller|RH70]], or [[RH10 MASSBUS controller‎|RH10]]. Up to 8 devices total can be attached to any MASSBUS controller. Data was protected by a 16-bit [[cyclic redundancy check|CRC]] per sector.
 The RS04 doubled the capacity (and bit rate) of the RS03 by recording on both sides of the [[platter]]; alternate bits in each word came from alternate sides.
@@ Line 35: / Line 35: @@
 They could store up to 512KB of data in 128 byte blocks (RS03), or 1024KB of data in 256 byte blocks (RS04). They used 64 fixed read/write [[head]]s per side for data (8 spares were provided), and 2 heads to read timing/address [[track]]s (a main and a backup).
-The second timing track did not provide reliability/redundancy; the two tracks were not recorded synchonously. (This seeming oversight may be explained from DEC's apparent intent that this device be used for [[swap|swapping]], where being unable to retrieve data would not be an issue. Indeed, the RS0x [[diagnostic]]s scribbled over the disk - which caused an issue the first time they were run at Bell Labs, where [[UNIX]] used one as a root drive!) Switch-over from one to another was manual, by inverting a connector.
+The second timing track did not provide reliability/redundancy; the two tracks were not recorded synchonously. (This seeming oversight may be explained from DEC's apparent intent that this device be used for [[swap|swapping]], where being unable to retrieve data would not be an issue. Indeed, the RS0x [[diagnostic]]s scribbled over the disk - which caused an issue the first time they were run at Bell Labs, where [[UNIX]] used one as a root drive!) Switch-over from one timing track to another was manual, by inverting a connector.
 The drive had the ability to write-protect tracks 0-N ('N' set in switches).
 {{semi-stub}}
 [[Category: MASSBUS Devices]]
 [[Category: DEC Disk Drives]]

← Older revision		Revision as of 17:33, 7 December 2018
Line 41:		Line 41:
	{{semi-stub}}		{{semi-stub}}

		+	[[Category: MASSBUS Devices]]
	[[Category: DEC Disk Drives]]		[[Category: DEC Disk Drives]]

@@ Line 35: / Line 35: @@
 They could store up to 512KB of data in 128 byte blocks (RS03), or 1024KB of data in 256 byte blocks (RS04). They used 64 fixed read/write [[head]]s per side for data (8 spares were provided), and 2 heads to read timing/address [[track]]s (a main and a backup).
-The second timing track did not provide reliability/redundancy; the two tracks were not recorded synchonously. Switch-over from one to another was manual, by inverting a connector.
+The second timing track did not provide reliability/redundancy; the two tracks were not recorded synchonously. (This seeming oversight may be explained from DEC's apparent intent that this device be used for [[swap|swapping]], where being unable to retrieve data would not be an issue. Indeed, the RS0x [[diagnostic]]s scribbled over the disk - which caused an issue the first time they were run at Bell Labs, where [[UNIX]] used one as a root drive!) Switch-over from one to another was manual, by inverting a connector.
 The drive had the ability to write-protect tracks 0-N ('N' set in switches).

← Older revision	Revision as of 15:26, 29 October 2020
(No difference)

@@ Line 6: / Line 6: @@
 | capacity = 512KB (RS03), 1024KB (RS04)
 | surfaces = 1 (RS03), 2 (RS04)
-| tracks = 64
+| tracks = 64 (plus 8 spares)
 | sectors = 64
 | words per sector = 128 bytes (RS03), 256 bytes (RS04)
@@ Line 13: / Line 13: @@
 | density = xxx bpi (maximum)
 | recording method = [[Modified Frequency Modulation‎|MFM]]
-| physical size = 15-3/4" (high), 19" (width)
+| physical size = 15-3/4" (high), 19" (width), 26-1/4" (depth)
-| weight = xxx lbs
+| weight = 120 lbs
-| power consumption = 13A (starting), 4A (operating)
+| power consumption = 13A (starting), 6A (operating)
 | controller = [[RH11 MASSBUS controller|RH11]] ([[UNIBUS]]), [[RH70 MASSBUS controller|RH70]], [[RH10 MASSBUS controller‎|RH10]]
 <!--
@@ Line 27: / Line 27: @@
 |}}
-The '''RS03''' and '''RS04 disk drives''' were [[MASSBUS]] fixed-platter [[fixed-head disk]] [[drive]]s. Their basic format was 18-[[bit]] [[word]]s (for use in [[PDP-10]] and [[PDP-15]] machines), but they couldbe used in [[PDP-11]]s, where they simply ignored two bits.
+The '''RS03''' and '''RS04 disk drives''' were [[MASSBUS]] fixed-platter [[fixed-head disk]] [[drive]]s. Their basic format was 18-[[bit]] [[word]]s (for use in [[PDP-10]] and [[PDP-15]] machines), but they could be used in [[PDP-11]]s, where they simply ignored two bits.
 The RS04 doubled the capacity (and bit rate) of the RS03 by recording on both sides of the [[platter]]; alternate bits in each word came from alternate sides.
-They could store up to 512KB of data in 128 byte blocks (RS03), or 1024KB of data in 256 byte blocks (RS04). They used xx fixed read/write [[head]]s for data, and yy heads to read timing/address [[track]]s (in two duplicated sets of 3, for reliability; switch-over from one set to another was manual).
+They could store up to 512KB of data in 128 byte blocks (RS03), or 1024KB of data in 256 byte blocks (RS04). They used 64 fixed read/write [[head]]s per side for data (8 spares were provided), and 2 heads to read timing/address [[track]]s (a main and a backup).
-<!-- The drive had the ability to write-protect tracks 0-N ('N' set in switches). -->
+The drive had the ability to write-protect tracks 0-N ('N' set in switches).
 {{semi-stub}}
 [[Category: DEC Disk Drives]]