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EK-DRZ01-IG-B01

May 1993

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Document:	RZ Series Disk Drive Inst Guide Models RZ35,RZ26,RZ27,RZ28
Order Number:	EK-DRZ01-IG
Revision:	B01
Pages:	20
Original Filename:

OCR Text

RZ Series Disk Drive
Installation Guide
Model RZ35
Model RZ26
Model RZ27
Model RZ28

Order Number: EK–DRZ01–IG. B01

July, 1993
The information in this document is subject to change
without notice and should not be construed as a
commitment by Digital Equipment Corporation.
Digital Equipment Corporation assumes no
responsibility for any errors that may appear in
this document.

Contents
1
2
3
4
5
6

Introduction . . . . . . . . . . . . . . . . .
SCSI Address and Options
Selections . . . . . . . . . . . . . . . . . .
SCSI Bus Termination . . . . . . . . . .
Power Connections and
Requirements . . . . . . . . . . . . . . . .
Mounting the Disk Drive . . . . . . . .
Summary of Specifications . . . . . . .

1
2
6
9
12
14

iii

1 Introduction
This installation guide contains the information you
need to configure and install the Digital Storage
Products SCSI disk drives, models RZ35, RZ26, RZ27,
and RZ28.
The RZ35 disk drive is a 3.5 inch model with a
formatted capacity of 852 megabytes, and a singleended SCSI-2 interface.
The RZ26 disk drive is a 3.5 inch model with a
formatted capacity of 1,050 megabytes and a singleended (S) SCSI-2 interface.
The RZ27 disk drive is a 3.5 inch model with a
formatted capacity of 1.6 gigabytes and a single-ended
(S) SCSI-2 interface.
The RZ28 disk drive is a 3.5 inch model with a
formatted capacity of 2.1 gigabytes and a single-ended
(S) SCSI-2 interface.
Be sure to read this installation guide thoroughly
(including all caution and warning notes) before
unpacking or handling the drive, or attempting
installation.
CAUTION
Handle the disk drive with care. Observe
antistatic precautions. Static electricity can
damage integrated circuits. Always use a
properly grounded wrist strap and antistatic
pad when removing the disk drive from its
antistatic bag and handling it outside the
bag.

2 SCSI Address and Options
Selections
The RZ series disk drives have option connectors
for setting the SCSI address and various operating
options. These operating options are described in the
following sections. The connector is normally used
in conjunction with jumpers which are supplied. The
jumpers are placed in the connector to select the
desired SCSI address and operating options.
The connector and various jumper placements are
shown in the figures that follow.

SCSI Bus Address Selection
Three pairs of pins on the option connector set the
disk drive’s address on the SCSI bus. The drive
accepts addresses 0 through 7. You must assign
a unique address to each device on a SCSI bus.
Typically, the first drive on the bus is assigned
address 0, the second drive address 1, and so on.
SCSI address 7 is usually reserved for the host
adapter.

FRONT VIEW
Option Connector
2
20

19
Pin 1 3 5
ID JUMPER SETTINGS
SCSI ID Pins 1,2 3,4 5,6
0
1
2
3
4
5
6
7

Spin Up Option Selection
The disk drive spins up when you install a jumper
across pins 13 and 14 of the option connector and
apply power. Without the jumper, the drive waits for
a START STOP UNIT command before spinning up.
The disk drive spins down when power is removed,
when a fault condition is detected, or in response to
the START STOP UNIT command.
LED Indicators
The disk drive has two surface-mounted LED
indicators: Busy (BSY) which is green and Fault
(FLT) which is amber.

FRONT VIEW
Fault LED
Option Connector
2
20

Busy LED

Pin 13,14 SPINUP Jumper
Spin up when power is applied.
Wait for START UNIT command.

The BSY LED indicates that the drive is working on
a SCSI command. It is not equivalent to the SCSI
BSY signal. The FLT LED indicates a drive fault
condition.
It is normal for both LEDs to light briefly upon
application of power.

Spindle Synchronization
Use Pin 19 of the option connector to connect the
drive for optional synchronized spindle operation.
The drive operates either as a Master, generating a
reference signal on Pin 19, or as a Slave, receiving
a reference signal on Pin 19 from another drive or
other source. Master or Slave operation modes are
set through the SCSI interface.
The drive always maintains local speed regulation
when no reference signal is applied.
Refer to the technical manual for more detail.

3 SCSI Bus Termination
The RZ35/26 disk drive provides termination power
to its own terminator resistor packs (if installed)
and/or to the SCSI bus. Alternatively, the drive’s
terminator resistor packs can be powered from
the SCSI bus. The figure below shows the proper
jumper arrangements for each terminator power
configuration. In all cases, the drive’s terminator
resistor packs are to be installed ONLY if the drive is
at the end of the SCSI bus.

BOTTOM VIEW
Drive provides termination power to the drive’s
terminator resistor packs (if installed).
SCSI bus provides termination power to the drive’s
terminator resistor packs (if installed).
Drive provides termination power to the drive’s
terminator resistor packs (if installed) and to SCSI bus.
No drive power provided to SCSI TERMPWR.
No power to drive terminator resistor packs.
Resistor packs must be removed.

SCSI Connector
(Single−Ended only)

The following figure shows the proper placement of
the terminator resistor packs on the RZ35/26 drive
model.
NOTE
S (single-ended) units use 8-pin packs.

Resistor Packs
BOTTOM VIEW

Pin 1
Designation

Pin 1 designations on the
resistor packs are usually
a "dot" or a "vertical bar".

Pin 1
Designation

Pin 1
Designation
SCSI Connector

For the RZ27/28 drives, the installation of the
TERMPWR jumper causes the drive to supply
termination power to the SCSI bus. Installing the
terminator ENABLE jumper actuates the on-board
active termination circuits. The figure that follows
shows the proper jumper arrangements for each
terminator power configuration.

BOTTOM VIEW
Drive provides power to SCSI TERMPWR.
Active termination is disabled.

No drive power provided to SCSI TERMPWR.
Active termination is enabled.

Drive provides power to SCSI TERMPWR.
Active termination is enabled.

No drive power provided to SCSI TERMPWR.
Active termination is disabled

SCSI Connector
(Single−Ended only)

4 Power Connections and
Requirements
Each disk drive requires +5 and +12 volt DC which
is supplied from an external source by means of the
4-pin power connector of the drive.

REAR VIEW
49

1
SCSI Interface Connector

Power Connector
Pin 1 +12VDC
Pin 2 +12V Return
Pin 3 +5V Return
Pin 4 +5VDC

The following table provides the disk drive voltage
regulation specifications.
Specification
Voltage & Regulation

Ripple & Noise
RZ28

Voltage

Tolerance

+5Vdc

+/- 5%

+12Vdc

+/- 5%
(+/- 6% during
spin-up)

+5Vdc

<75mv p-p

+12Vdc

<200mv p-p
<150mv p-p

The following table provides the disk drive current
and power specifications.
Specification

RZ35/26

RZ27

RZ28

Typical/Maximum
+5Vdc Current

.71/.85A

.78/.86A

.91/1.05A

2.29/2.55A

2.65/2.89A

2.58
/2.75A

+12Vdc Current
Spin-up
Idle

.64/.74A

.63/.69A

.45/53A

Random seeks
(1-block reads)

.85/.96A

.91/.96A

.72/.75A

Idle

11.23
/13.79W

11.46
/13.21W

9.95
/12.19W

Random seeks
(1-block reads)

13.75
/16.56W

14.82
/16.61W

13.19
/14.96W

Total Power

Note
Maximum values above include 5% high
supply voltage.

5 Mounting the Disk Drive
You can mount the disk drive in any position. Allow
0.050 inches of clearance from adjacent surfaces and
sufficient slack in all cables, to provide drive motion
on its shock mounts relative to the drive frame.
The drive is mounted with four 6-32 screws.
CAUTION
The mounting screws should not protude
more than four threads beyond the inside
surface of the drive frame. Screws longer
than specified can disable the shock
mounting process and damage the drive.

0.250
2.375

0.625

1.625

1.125

4.000
5.750

0.125

4.00

3.750

0.125

2.375

1.750

6 Summary of Specifications
The following two tables provide the disk drive
functional specifications.
Specification

RZ35

RZ26

RZ27

RZ28

Interface

SCSI-2

Formatted storage
(Mbytes)

852

1050

1600

2100

Average seek time

9.5 ms

9.7 ms

Maximum bits per inch

56,000

54,100

64,000

Tracks per inch

2,756

3,215

Tracks per surface

2,086

2,570

2,599

3,062

Surfaces per drive

Sector Capacity (Bytes)

512520

Transfer rate (Mbytes/s
to/from media)

2.6

2.446.25

3.4-6.9

Normal mode
synchronous bus
transfer rate (Mbytes/s)

5.0

Fast mode synchronous
bus transfer rate
(Mbytes/s)

10.0

Rotational speed (RPM)

5,363

5,403

The following table provides the RZ35, RZ26, RZ27,
and RZ28 disk drive environmental specifications.
Specification

Value

Operating
temperature

10C to 50C (50F to 122F)

RZ27/28

5C to 55C (41F to 131F)

Nonoperating
temperature

-40C to 66C (-104F to 151F)

Relative humidity
(Operating)

10% to 90% with maximum wet bulb
temperature of 25.6C (78F) and a
minimum dew point of 2C (36F), with
no condensation

Relative humidity
(Nonoperating)

8% to 95%

Altitude operating
RZ28
Altitude
nonoperating

2,438m (8,000 ft)
3,048m (10,000 ft)
4,876m (16,000 ft)

Single−Ended SCSI 50−Pin Connector Pin Assignments
Pin

Signal

−DB (0)

−DB (7)

GROUND

−MSG

−DB (1)

−DB (P)

−ATN

−SEL

−DB (2)

GROUND

−C/D

−DB (3)

GROUND
RESERVED

48
50

−REQ

−DB (4)

36
38

−BSY

22
24

−DB (5)

TERMPWR

−RST

−ACK

−I/O

14 −DB (6)
28 RESERVED
Notes:
1. All odd numbered pins (except pins 23,25,27) must be connected to ground.
2. Pin 25 should be left open.
3. Pin 26 (SCSI_TERMPWR) is reserved for terminator resistor power source.
4. The minus sign indicates an active low signal..