Digital Equipment RW504-ZA User manual

SmallOpticalDiskLibrary
ServiceManual
Part Number: EK–SOL10–SV.B01
Revision/Update Information: This manual supersedes Part Number
EK–SOL10–SV.A01.
Digital Equipment Corporation
Maynard, Massachusetts

First printing, May 1993
Revision, October 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.
The software described in this document is furnished under a license and may be used or copied
only in accordance with the terms of such license.
Digital Equipment Corporation assumes no responsibility for the use or reliability of its software
on equipment that is not supplied by Digital or its affiliated companies.
© Digital Equipment Corporation 1993.
Reproduced with Permission of the Hewlett-Packard Company
The following are trademarks of Digital Equipment Corporation: DEC, Digital, VAX,
VAX DOCUMENT, VMS, and the DIGITAL logo.
Torx is a registered trademark of the Camcar Division of Textron.
All other trademarks and registered trademarks are the property of their respective owners.
U.S.A.
This equipment generates, uses, and may emit radio frequency energy. The equipment has
been type tested and found to comply with the limits for a Class A computing device pursuant
to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection
against such radio frequency interference. Operation of this equipment in a residential area may
cause interference in which case the user at his own expense will be required to take whatever
measures may be required to correct the interference.
This document was prepared using VAX DOCUMENT, Version 2.1.

Contents
Preface ................................................ xi
1 Introduction
1.1 Optical Disk Libraries Overview .................... 1–1
1.2 Product Features . ............................... 1–1
1.3 Optical Library Components ....................... 1–2
1.3.1 The Optical Drive Mechanism ................... 1–4
1.3.2 Magneto-Optical Disks . . ....................... 1–5
1.4 SCSI Interface Options ........................... 1–5
1.4.1 Single-ended SCSI Interface .................... 1–5
1.4.2 Differential SCSI Interface ..................... 1–6
1.5 Product Matrix . . . ............................... 1–6
1.6 Specifications ................................... 1–7
1.7 Optical Disk Specifications . . ....................... 1–12
1.8 Related Documents .............................. 1–14
2 Environmental/Installation/PM
2.1 Environmental Requirements ...................... 2–1
2.2 Operating Temperature/Clearance Requirements. . ...... 2–1
2.3 Location Requirements ........................... 2–1
2.4 Primary Power/External Ground .................... 2–2
2.5 Unpacking Procedure ............................. 2–2
2.6 Installation Procedures ........................... 2–3
2.6.1 Contents of Shipment . . ....................... 2–3
2.6.2 Uncrating the RW504/RW524 Optical Library . ...... 2–4
2.6.3 Installing the RW504/RW524 Optical Library . ...... 2–4
2.6.4 Checking the Fuse and Voltage Setting ............ 2–9
2.6.4.1 Changing the Voltage Configuration ........... 2–10
2.6.5 Connecting an Uninterruptible Power Supply
(UPS) ...................................... 2–10
2.7 Hardware Verification ............................ 2–11
iii

2.8 Moving the RW504/RW524 Optical Disk Library . . ...... 2–12
2.8.1 Moving a Short Distance ....................... 2–12
2.8.2 Shipping the RW504/RW524 Optical Disk Library .... 2–13
2.9 Preventative Maintenance . . ....................... 2–15
3 Product Operation and Configuration
3.1 Front Panel/Control Panel Operations . ............... 3–1
3.2 Rear Panel Features and Controls ................... 3–3
3.3 Setting and Displaying Configurations. ............... 3–5
3.3.1 Setting a Configuration (CONF). . . ............... 3–5
3.3.2 Displaying Information Logs (INFO) .............. 3–5
3.3.3 Choosing Tests and Displaying Results (TEST) ...... 3–6
3.3.4 Setting the SCSI Address....................... 3–7
3.3.5 Securing the Optical Disk Library . ............... 3–8
3.3.6 Setting a New Security Code .................... 3–8
3.3.7 Restricting Disk Insertion and Removal ........... 3–10
3.3.7.1 Setting CONF 15 or CONF 20 . ............... 3–10
3.3.8 Controlling Mailslot Rotation .................... 3–11
3.3.9 Host Configuration ............................ 3–11
3.4 Autochanger Configuration Choices . . . ............... 3–12
4 Troubleshooting and Diagnostics
4.1 Operation/Installation Error Information .............. 4–2
4.2 Power-on Self-tests............................... 4–6
4.3 Optical Disk Cleaning ............................ 4–7
4.3.1 Cleaning Tools Available ....................... 4–8
4.4 Using the Eject Tool to Remove a Disk from the Drive . . . 4–9
4.5 Troubleshooting Using the Control Panel and
Observation .................................... 4–10
4.5.1 The Autochanger Lists the First ‘‘Possibles’’ . . ...... 4–11
4.5.2 How to Use the Results of the Internal Tests . . ...... 4–12
4.5.3 The FRU Isolation Test Sequence . ............... 4–14
4.6 Information Logs . ............................... 4–15
4.7 Recovery from Hardware Errors .................... 4–20
4.7.1 Hardware Error Codes and Recovery Procedures ..... 4–20
4.8 Error Information Through SCSI Commands .......... 4–30
4.9 Diagnostics..................................... 4–31
4.9.1 Offline Diagnostics ............................ 4–32
4.9.2 Internal Diagnostic Tests ....................... 4–32
4.10 Diagnostic Test Command Descriptions ............... 4–33
4.10.1 Sequence Tests ............................... 4–34
iv

4.10.2 Electronic Core Tests . . ....................... 4–38
4.11 The FIND HOME Sequence and Information Logs ...... 4–41
4.11.1 Specific Steps of the FIND HOME Sequence . . ...... 4–41
4.12 Micro-Move Reference Table for Viewing FIND HOME
Sequence ...................................... 4–44
5 Removal and Replacement
5.1 Field-Replaceable Assemblies....................... 5–1
5.2 ESD Precautions . ............................... 5–1
5.3 Tools Required . . . ............................... 5–2
5.4 Assembly/Disassembly Procedures ................... 5–2
5.4.1 Service Access ............................... 5–2
5.4.2 Replacing the Autochanger Controller PCA . . . ...... 5–4
5.4.3 Replacing the Front Bezel Assembly .............. 5–8
5.4.4 Replacing the Front Operation Switch/Cable
Assembly ................................... 5–10
5.4.5 Replacing the Fan/Display/Operation Button
Assemblies . . . ............................... 5–12
5.4.6 Replacing the Mailslot Assembly . . ............... 5–14
5.4.7 Replacing the Optical Drive Mechanism ........... 5–16
5.4.8 Replacing the Interconnect PCA . . ............... 5–22
5.4.9 Replacing the Picker/Carriage Assembly ........... 5–23
5.4.10 Replacing the Leadscrew Assembly ............... 5–26
5.4.11 Replacing the Power Supply .................... 5–29
5.4.12 Replacing the Magazine Guides . . . ............... 5–31
5.4.13 Replacing the Internal UPS Cable . ............... 5–33
5.4.14 Replacing the SCSI Cable ...................... 5–33
5.5 Reinitializing the Autochanger Controller PCA RAM after
Service . ....................................... 5–34
5.5.1 Variables Set by Configuration 16 . ............... 5–34
5.5.2 Variables Set by Configuration 18 . ............... 5–35
5.6 Replaceable Parts. ............................... 5–36
5.6.1 Recommended Service Kit ...................... 5–36
6 Theory of Operation
6.1 The Autochanger . ............................... 6–1
6.1.1 Movements . . . ............................... 6–1
6.1.2 Mechanics . . . ............................... 6–4
6.2 The Autochanger Controller PCA.................... 6–4
6.3 The Power Supply ............................... 6–7
6.4 The Multifunction Optical Drive and Drive Controller.... 6–8
v

6.4.1 Controller PCA............................... 6–8
6.4.1.1 SCSI Controller ........................... 6–9
6.4.1.2 Data Buffer .............................. 6–9
6.4.1.3 Formatter/Sequencer ....................... 6–9
6.4.2 Servo PCA . . . ............................... 6–9
6.4.2.1 DSP Microprocessor and Support/Servo Control
Loops ................................... 6–9
6.4.2.2 Read and Write Channel Electronics ........... 6–10
6.4.3 Mechanism Assembly . . . ....................... 6–10
6.4.3.1 Loader Mechanism . . ....................... 6–10
6.4.3.2 Optical Head ............................. 6–10
6.5 Optical Disk Layout and Error Correction ............. 6–10
6.5.1 Optical Disk Layout—650-Mbyte Capacity.......... 6–11
6.5.2 User Zone Layout—650-Mbyte Capacity ........... 6–11
6.5.3 Optical Disk Layout—1.3-Gbyte Capacity .......... 6–14
6.5.4 User Zone Layout—1.3-Gbyte Capacity ............ 6–14
6.5.5 Drive Defect Management ...................... 6–18
6.5.6 Slip Sparing Algorithm . ....................... 6–20
6.5.7 Replacement Sparing Algorithm . . ............... 6–20
6.5.8 Error Thresholds ............................. 6–21
6.6 Error Detection and Recovery ...................... 6–22
6.6.1 Error Detection .............................. 6–23
6.6.2 Error Recovery Processes ....................... 6–24
6.6.3 SCSI Detected Errors . . . ....................... 6–24
6.6.4 Move Errors . . ............................... 6–25
6.6.5 Hardware Error Codes . . ....................... 6–26
6.6.6 Real Time Event Logging ....................... 6–26
6.7 The SCSI Interface .............................. 6–27
6.7.1 SCSI Command Set ........................... 6–27
A Offline Diagnostic Information
A.1 System Error Report ............................. A–1
A.2 Autochanger Error Codes . . . ....................... A–3
A.3 Drive SCSI-2 Reference ........................... A–13
A.4 Offline Diagnostics ............................... A–27
vi

B Basic Supplies and Reorderable Parts
B.1 Basic Supplies and Reorderable Parts . ............... B–1
C Connecting Multiple Optical Libraries
C.1 Connecting Two Optical Library Units to Two SCSI Ports
.............................................. C–1
C.2 Connecting Two Optical Library Units to One SCSI
Port . . . ....................................... C–2
C.3 Resetting Controller and Drive SCSI Addresses . . ...... C–3
Index
Figures
1–1 Optical Disk Library Components . ............... 1–3
2–1 Removing the Shipping Screw ................... 2–4
2–2 Attaching the SCSI Cable to the RW504/RW524
Optical Disk Library . . . ....................... 2–6
2–3 Rear Panel . . . ............................... 2–8
2–4 Replacing the Shipping Screw ................... 2–14
3–1 Front Panel . . ............................... 3–1
3–2 Rear Panel . . . ............................... 3–3
4–1 Information and Tests Through the Control Panel .... 4–10
4–2 The Autochanger Returns Suspect FRUs ........... 4–11
4–3 How Service Views the Suspect FRUs ............. 4–13
4–4 Information and Tests Through the SCSI Bus . ...... 4–31
5–1 Controller PCA Cable Connections. ............... 5–5
5–2 Removing the Autochanger Controller PCA . . . ...... 5–6
5–3 Dip Switch Location on the Controller PCA . . . ...... 5–7
5–4 Front Bezel Mounting Screws ................... 5–9
5–5 Disconnecting the Mailslot Sensor Cable and Front
Panel Cable . . ............................... 5–10
5–6 Removing the Display Assembly . . ............... 5–13
5–7 Mailslot Mounting Screws ...................... 5–15
5–8 Picker Service Position . . ....................... 5–17
5–9 Optical Drive Mechanism Cable Connections . . ...... 5–18
vii

5–10 Drive Mounting Screws and Optical Sensor Cable
Locations ................................... 5–19
5–11 Sliding the Drive Mechanism Out of the Library ..... 5–20
5–12 Removing the Drive Plate and Optical Sensor . ...... 5–21
5–13 Removing the Interconnect PCA . . ............... 5–23
5–14 Removing the Carriage/Picker Assembly ........... 5–24
5–15 Removing the Carriage Shaft .................... 5–25
5–16 Removing the Leadscrew Mounting Screw .......... 5–26
5–17 Securing the Picker to the Top of the Autochanger . . . 5–27
5–18 Removing the Leadscrew Assembly ............... 5–28
5–19 Preparing the Leadscrew Assembly for
Replacement. . ............................... 5–29
5–20 Removing the Power Supply Assembly ............ 5–30
5–21 Removing the Magazine Guides . . . ............... 5–32
5–22 Optical Disk Library Exploded View (Sheet 1 of 3) . . . 5–39
5–23 Optical Disk Library Exploded View (Sheet 2 of 3) . . . 5–40
5–24 Optical Disk Library Exploded View (Sheet 3 of 3) . . . 5–41
6–1 SCSI Command Translation for Autochanger
Operation ................................... 6–2
6–2 Autochanger Controller PCA Block Diagram . . ...... 6–5
6–3 Functional Diagram ........................... 6–8
6–4 Optical Disk Layout ........................... 6–12
6–5 User Zone Layout for 650-Mbyte Media ............ 6–13
6–6 User Zone Layout for 1.3-Gbyte Media, g=1 . . . ...... 6–15
6–7 User Zone Layout for 1.3-Gbyte,g=16 .............. 6–16
6–8 Error Detection and Recovery ................... 6–22
A–1 System Error Report . . . ....................... A–2
A–2 Jukebox Request Sense Data Parameter Block
Format ..................................... A–3
A–3 Jukebox Request Sense—Additional Sense Data ..... A–5
A–4 Drive Request Sense Data Parameter Format . ...... A–14
C–1 Connecting Two Optical Library Units (RW504/RW524)
to One SCSI Port ............................ C–2
viii

Tables
1Conventions Used in This Guide . . ............... xii
1–1 RW504/RW524 Components ..................... 1–4
1–2 Optical Disk Library Products Matrix ............. 1–6
1–3 Specifications and Characteristics of Optical Disks . . . 1–12
1–4 Related Documentation . ....................... 1–14
1–5 Pass Documents .............................. 1–14
2–1 Fuse Specifications and Part Numbers ............ 2–9
2–2 UPS Power Requirements ...................... 2–11
3–1 Front Panel Controls . . . ....................... 3–2
3–2 Rear Panel Features and Controls . ............... 3–3
3–3 Autochanger Configuration Choices ............... 3–12
4–1 Operation/Installation Troubleshooting ............ 4–2
4–2 Information Logs (INFO Logs) ................... 4–16
4–3 Recovery Procedures for Specific Hardware Errors . . . 4–21
4–4 Sequence Tests ............................... 4–34
4–5 Exerciser Tests ............................... 4–36
4–6 Electronic Core Tests . . . ....................... 4–38
4–7 RW504/RW524 Micro-Move ID Table .............. 4–44
5–1 SW2 Default Settings . . . ....................... 5–8
5–2 Exchange Assemblies . . . ....................... 5–36
5–3 Non-exchange Assemblies ...................... 5–37
6–1 Values for n and m for 1.3-Gbyte with g=16 (1024
media) ..................................... 6–17
6–2 Physical Revolution to Logical Track Layout . . ...... 6–17
6–3 Error Thresholds ............................. 6–22
6–4 Group 0 Commands (6-byte command) ............ 6–28
6–5 Group 1 and 2 Commands (10-byte command) . ...... 6–29
6–6 Group 5 Commands (12-byte command)............ 6–30
A–1 Sense Key and Additional Sense Length Values ..... A–4
A–2 Autochanger Move Errors ...................... A–9
A–3 Autochanger Micro-Move Error Codes ............. A–11
A–4 Drive Request Sense - Additional Sense Code
Values ..................................... A–16
A–5 HP-Specific Drive Error Codes ................... A–19
ix

Preface
This manual assumes you are familiar with computer terms. It is divided into
seven chapters and three appendixes and is organized to allow you to quickly
find the information that you need.
This manual contains the following information:
• Chapter 1 provides an introduction that lists the features and components,
product configurations, and the characteristics of the drive mechanism and
the disks for the RW504-ZA and the RW524-ZA optical disk libraries. This
manual refers to these optical disk libraries as RW504 and RW524.
• Chapter 2 provides environmental, installation and preventive mainte-
nance information on the RW504 and RW524 optical disk libraries.
• Chapter 3 provides configuration and operating information on the RW504
and RW524 optical disk libraries.
• Chapter 4 provides troubleshooting and diagnostics information on the
RW504 and RW524 optical disk libraries.
• Chapter 5 provides removal and replacement procedures for the field-
replaceable assemblies in the RW504 and RW524 optical disk libraries.
• Chapter 6 provides theory of operation information on the RW504 and
RW524 optical disk libraries.
• Appendix A provides offline diagnostic information, a VAX system error
report sample and SCSI-2 reference.
• Appendix B provides a list of basic supplies and reorderable parts.
• Appendix C lists information about, and procedures for, connecting multiple
optical libraries.
xi

Conventions Used in This Guide
Table 1 Conventions Used in This Guide
Convention Use
Italics Italic text is used for titles of manuals and other publications.
Monospace type Anything that is displayed on the control panel of the
optical disk library is set in this monospace type.
Boldface type Anything that you are asked to type is set in this
boldface type.
Keys Keys indicate the key to press on the control panel of the
optical disk library.
Note A note calls attention to information which is helpful in
understanding the operation of the product.
CAUTION Caution notes provide information that protects your optical
disk library from being damaged.
WARNING Warning notes provide information that protects you from being
harmed.
xii

1
Introduction
1.1 Optical Disk Libraries Overview
The RW504-ZA and RW524-ZA are optical disk libraries that contain a
multifunction optical drive. They have storage slots for sixteen 5.25-inch
optical disks for a total storage capacity of 10 Gbytes or 20 Gbytes, respectively.
Both rewritable and write-once optical disks can be used; they must be 512 bytes
per sector format.
There are two basic optical disk libraries:
• RW504-ZA (known as the RW504)
• RW524-ZA (known as the RW524)
The main difference between these two library versions is storage capacity. The
RW524 has approximately twice the storage capacity of the RW504. This added
capacity is due to a difference in the optical drives contained in the libraries. The
RW524 contains a 1.3-Gbyte drive, an enhanced version of the 650-Mbyte drive
that is used in the RW504 version libraries. The 1.3-Gbyte drive supports the use
of 1.2-Gbyte disks as well as the 594-Mbyte disks that are supported for use with
650-Mbyte drives. Other than the added support of 1.2-Gbyte disks, the RW524
libraries are mechanically, electrically, and operationally the same as the RW504
libraries, and both versions support the SCSI-2 command set.
1.2 Product Features
The optical disk library has the following features and meets the following
specifications:
• Direct online access to data
• High reliability and data security when using rewritable and write-once
5.25-inch optical disks
Introduction 1–1

DEC magneto optical disks meet the following standards:
594 Mbyte rewritable optical disks are Continuous Composite (CC)
format, conform to ISO/IEC 10089A; ANSI X3.212-199x and 1.2 Gbyte
optical disks meet ECMA 184 standard for CC format.
594 Mbyte write-once disks are Continuous Composite Write-Once (CCW)
format, conform to ISO/IEC DIS 11560; ANSI X3.220-199x and 1.2 Gbyte
optical disks meet ECMA 184 standard for CCW format.
• Data security through the ability to ‘‘lock’’ the library, preventing disk
removal.
• SCSI Interface
Single-ended
SCSI-2 command set
• Autochanger reliability of:
40,000 hours MTBF (Mean Time Between Failure)
300,000 MSBF (Mean Swaps Between Failure)
• Modular replacement of all major assemblies
• Digital signal processor (DSP) based servo built into the drive mechanism for
faster seek times and lower error rates
• Split optics resulting in the use of a lighter optical head for faster and more
accurate data access
• Full read and write data caching to optimize system performance
1.3 Optical Library Components
Usually each SCSI-connect peripheral requires one SCSI address. With the disk
library, however, there are two unique SCSI interface addresses— one SCSI
address for the autochanger controller and one for the drive contained in the disk
library.
The autochanger controller and the host operating system manage communication
through the SCSI bus to each drive’s unique SCSI address.
Table 1–1 is a discussion of the optical library components. Refer to Figure 1–1
for component locations.
1–2 Introduction

Figure 1–1 Optical Disk Library Components
Carriage & Rails
Mailslot
Storage Slots
2
3
6
MK445−01
Disk Drive
Picker
7
1
Introduction 1–3

Table 1–1 RW504/RW524 Components
Component Description
Disk Drive The optical disk library contains one multifunction optical
disk drive for read/write data transfer. The drive requires
its own unique SCSI address and is located next to the front
panel at the bottom of the optical library. See Section 1.3.1 for
additional drive information.
Storage Slots The optical disk library contains 16 storage slots for holding
optical disks.
Mailslot The mailslot is used to insert or remove optical disks from the
disk library.
Front Panel The front panel includes a control panel used to manage and
display library functions and a mailslot for inserting and
removing disks. Control panel functions are described in
Section 3.1.
Rear Panel The rear panel includes SCSI and power cord connections,
a fuse receptacle, a 9-pin serial connector for attaching an
uninterruptable power supply (UPS), and a voltage select
switch.
Rail and Carriage The rail and carriage support the picker for its movement
within the disk library.
Picker The picker rotates, flips, and transports optical disks to and
from the storage slots, mailslot, and optical drive.
The RW504/RW524 is available as a single-ended SCSI interface.
1.3.1 The Optical Drive Mechanism
The optical drive mechanism is a multifunction drive and, therefore, operates
in both rewritable and write-once modes. The drive uses both rewritable and
write-once 5.25-inch magneto-optical disks that comply with ANSI and ISO
standards for Continuous Composite format. The drive senses the disk type and
automatically operates in either rewritable or write-once mode.
The drive has a 3600 rpm rotational speed and can achieve a maximum sustained
write transfer rate of 0.5 to 0.8 Mbytes per second and a maximum sustained
read transfer rate of 1- to 1.6-Mbyte per second, depending on the media and
drive capacity. The error rate is less than one block in error per 10
14 bytes.
Immediate response mode and write caching are used by the drive mechanism
to achieve its high write performance. However, if a power failure occurs while
write data is in the buffer, the drive may not have enough power to complete
the write operation and empty the buffer. Therefore we recommend that an
1–4 Introduction

uninterruptable power supply (UPS) be used with battery backup to ensure that
no data is lost if a power failure occurs.
1.3.2 Magneto-Optical Disks
Magneto-Optical (MO) disks are more durable, more reliable, removable, and cost
far less per megabyte than magnetic disks. MO disks are made of the same kind
of plastic used in bullet-proof windows. Data can be read through fingerprints
and minor scratches. MO disks can withstand x-rays, magnetic interference, and
can be dropped from desk height without damage.
Magneto-Optical disks store data on a magnetic layer in the form of magnetic
flux reversals rather than on a pitted surface used in other optical technologies.
Because surfaces of the MO disk are not physically changed, they can be written
to and erased repeatedly with no measurable data degradation. Optical disks
have an archival life of thirty years based on accelerated life tests for data
retention.
The disk is mounted in a rigid plastic case with a metal shutter, similar to a
3.5-inch magnetic flexible disk. Optical disk storage capacity varies depending
on the disk type. (Check the host system documentation to determine which disk
format is supported.) The MO disk has two recording sides. To access the second
side, the cartridge must be ejected, turned over, and reinserted into the drive.
There are two types of magneto-optical disks: rewritable optical disks and write-
once optical disks. (Check the host system documentation to determine which
disk type(s) are supported.) The two disk types can be differentiated by the words
‘‘rewritable’’ or ‘‘write-once’’ printed on the disk’s metal shutter.
For data safety, you can independently write-protect each side of the disk by
setting the write-protect tab on the corner of the cartridge.
1.4 SCSI Interface Options
The optical disk library connects to the host system with a single-ended SCSI
interface This interface conforms to SCSI standards ANSI X3.131-SCSI-2.
1.4.1 Single-ended SCSI Interface
The single-ended interface specifies the use of a single-ended SCSI repeater PCA.
This PCA enables the library to be connected to an external single-ended SCSI
bus. The total SCSI cable length between peripherals and the host is 6 meters.
In addition, an internal SCSI cable length of 2.1 meters must be included in this
calculation.
Introduction 1–5

1.4.2 Differential SCSI Interface
The differential SCSI interface specifies the use of a differential SCSI repeater
PCA. This PCA enables the library to be connected to an external differential
SCSI bus. The differential SCSI repeater PCA uses the equivalent of 10 meters
of SCSI cable internally, so the allowable external cable length is limited to 15
meters instead of the 25 meters usually allowed on a differential SCSI bus.
1.5 Product Matrix
The following products are discussed in this manual. To determine the product
and option numbers, find the product information labels located on the library’s
rear panel and check the corresponding information in Table 1–2.
Table 1–2 Optical Disk Library Products Matrix
Product No.
/Options Description HP Designation
RW504-ZA 10.4-Gbyte multifunction optical disk library—
includes one 650-Mbyte 5.25-inch multifunction
optical drive mechanism and a single-ended SCSI
interface.
Model 10LC
(C1718C)
RW524-ZA 20.8-Gbyte multifunction optical disk library—
includes one 1.3-Gbyte 5.25-inch multifunction
optical drive mechanism and a single-ended SCSI
interface.
Model 20LT
(C1718T)
RW524-UB Converts 650-Mbyte multifunction drives to 1.3
Gbyte multifunction drives to be used with a
RW504 jukebox. Consists of one 1.3-Gbyte drive,
RFI shield, and installation guide.
1–6 Introduction

1.6 Specifications
This section provides:
• Performance Specifications
• Physical Characteristics
• Environmental Specifications
• Power Requirements
• Service Characteristics
• Product Certification
Introduction 1–7

Performance SpecificationsOptical Disk Library System
Capacity 16 disks
10.4 Gbytes (RW504) or
20.8 Gbytes (RW524)
Drives 1, 5.25-inch multifunc-
tion 650-Mbyte (RW504)
or 1.3-Gbyte (RW524)
optical disk drive
Average disk exchange time (excluding
drive load/unload sequences) 7 seconds
Interface Single-ended asyn-
chronous SCSI
Multifunction Optical Drives
650 Mbytes 1.3 Gbytes
Rotational speed 3600 rpm 2400 rpm
Average seek 25 ms 23.5
Short stroke seek (across 2.2 Mbytes) 8 ms 4 ms
Full stroke seek 50 ms 45 ms
Single track seek (track-to-track) 2 ms 2 ms
Average rotational delay 8.33 ms 12.5 ms
Bias magnet rotation time 8 ms (maximum) 8 ms (maximum)
Average access time 35 ms
Burst transfer rate 3 Mbytes/s (asyn-
chronous) 3 Mbytes/s (asynchronous)
5 Mbytes/s (syn-
chronous) 5 Mbytes/s (synchronous)
Data transfer rate (host dependent) 1 Mbyte/s (read) .8-1.6 Mbyte/s
(read)
.5 Mbytes/s (write) .4-.8 Mbytes/s
(write)
Load time (including spin-up) 2.5 seconds (average) 2.3 seconds
(average)
Unload time (including spin-down) 2.0 seconds (average) 1.4 seconds
(average)
1–8 Introduction