Digital Equipment TZS20 Series User manual

TZS20 25/50 GB
AIT Cassette Tape Drive
User's Guide
EK–TZS20–UG. B01
Digital Equipment Corporation
Maynard, Massachusetts

Second Edition, May 1997
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.
Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to
restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and
Computer Software clause at DFARS 252.227-7013.
Digital Equipment Corporation does not give a warranty of any kind regarding the
fitness or applicability of the information content for a particular purpose. The user
assumes all responsibility for understanding the interrelationships of this enclosed
information with other affected software or system products.
The disclosure of this information does not grant to the user a license under any patents,
pending patents, trademarks, or copyrights or other rights of Digital Equipment
Corporation, or of any third party.
The following FCC and VCCI notices apply to the table top TZS20. Embedded versions
of the drive will be covered in similar notices in documentation for the system, or
storage enclosure in which the embedded drive resides.
FCC Notice:
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
Any modifications to this device - unless expressly approved by the manufacturer - can
void the user’s authority to operate this equipment under part 15 of the FCC rules.
Operation is subject to the following two conditions: (1) This device may not cause
harmful interference and (2) This device must accept any interference that may cause
undesirable operation.

This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the
following measures:
• Re-orient or relocate the receiving antenna
• Increase the separation between the equipment and receiver
• Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected
• Consult the dealer or an experienced radio/TV technician for help
The table top drive requires shielded interface cables in order to comply with FCC
emission limits.
VCCI Notice for Japan:
UNIX is a registered trademark in the United States and other countries, licensed
exclusively through X/Open Company, Ltd.
The following are trademarks of Digital Equipment Corporation:
AXP, DEC, DECdirect, DECservice, DIGITAL, OpenVMS, SERVICenter, TZS20,
VAX, VMS, and the DIGITAL Logo.
© Digital Equipment Corporation 1997 All Rights Reserved
Printed in U. S. A

EK–TZS20–UG. B01 v
Contents
Revision Record.................................................................................................................vii
About This Manual...........................................................................................................ix
1 Introduction
1.1 Product Overview................................................................................................... 1–1
1.2 Data Compression.................................................................................................. 1–1
1.3 Operating System Support...................................................................................... 1–2
1.4 TZS20 Models........................................................................................................ 1–3
2 Installing the Tape Drive
2.1 Unpacking the Tape Drive...................................................................................... 2–1
2.2 Installing the TZS20 Embedded (Internal) Tape Drive............................................ 2–1
2.3 Installing the TZS20-DB Tabletop (External) Tape Drive....................................... 2–5
2.4 Installing and Removing the SBB Tape Drive ........................................................ 2–6
2.5 Verifying the Installation of the Tape Drive ........................................................... 2–6
3 Operating the Tape Drive
3.1 Controls and Indicators .......................................................................................... 3–1
3.2 Summary of Tape Drive LED Indications............................................................... 3–3
3.3 Powering Up the Tape Drive .................................................................................. 3–4
3.4 Setting the Write-protect Switch............................................................................. 3–5
3.5 Loading a Cartridge into the Drive......................................................................... 3–6
3.6 Removing the Tape Cartridge from the Tape Drive ................................................ 3–7
3.7 Media Error Rate Warning..................................................................................... 3–7
4 Care, Maintenance and Problem Solving
4.1 Cleaning the Tape Drive Head................................................................................ 4–1
4.2 Taking Care of Tape Cartridges.............................................................................. 4–2
4.3 Tape Drive Problem Solving .................................................................................. 4–2
4.4 Emergency Tape Removal Procedure..................................................................... 4–3
4.5 Service Offerings ................................................................................................... 4–4

TZS20 AIT Cassette Tape Drive – User’s Guide
EK–TZS20–UG. B01vi
Appendix A
Supplies........................................................................................................................A–1
Appendix B
Specifications ...............................................................................................................B–1
Appendix C
Supported SCSI Messages and Commands....................................................................C–1
Readers Comment Form .......................................................................Inside Back Cover
Figures
1–1 DS-TZS20-DB Tabletop Tape Drive........................................................................ 1–3
1–2 Front View of TZS20-AB Embedded Tape Drive..................................................... 1–3
1–3 DS-TZS20-VB StorageWorks SBB Unit.................................................................. 1–4
2–1 Setting the SCSI ID, Embedded Tape Drive............................................................. 2–2
2–2 Option Switch Settings............................................................................................ 2–4
2–3 Connecting the DS-TZS20-DB Tabletop Model....................................................... 2–5
3–1 TZS20 Tabletop Tape Drive .................................................................................... 3–1
3–2 Setting the Write-protect Switch on the Tape Cartridge........................................... 3–5
3–3 Inserting the Tape Cartridge .................................................................................... 3–6
3–4 Removing the Tape Cartridge.................................................................................. 3–7
4–1 Emergency Tape Cartridge Removal Procedure....................................................... 4–4
Tables
2–1 SCSI ID Jumper Settings......................................................................................... 2–3
2–2 Option Switch Descriptions ..................................................................................... 2–4
3–1 Possible LED Indications and Their Meaning.......................................................... 3–3
3–2 Power On Self Test LED Display Sequence............................................................. 3–4

EK–TZS20–UG. B01 vii
Revision Record
This Revision Record provides a concise publication history of this guide. It lists the
guide revision levels, release dates, and reasons for the revisions.
The following revision history lists all revisions of this publication and their effective
dates. The publication part number is included in the Revision Level column, with the
last entry denoting the latest revision. This publication supports the TZS20 AIT
Cassette Tape Drive.
Revision Level Date Summary of Changes
EK–TZS20–UG. A01 April, 1997 Initial release
EK–TZS20–UG. B01 May, 1997 Update and add regulatory
information

EK–TZS20–UG. B01 ix
About This Manual
This manual describes the installation and operation of the TZS20 AIT Cassette
Tape Drive.
Visit Our Web Site for the Latest Information
Check our web for the latest drivers, technical tips, and documentation. We can be
found in the technical area of our web page, http://www.storage.digital.com/
Audience
This guide supports the user of the TZS20 Cassette Tape Drive. You should be familiar
with tape drive terminology and the use of PCs and workstations.
Document Organization
This guide contains the following:
Chapter 1: Introduction
Chapter 1 provides an overview of the TZS20 and identifies the products covered
in this manual.
Chapter 2: Installing the Tape Drive
Chapter 2 provides instructions on how to install and configure the tape drive
models covered in this guide, including instructions on how to set the SCSI ID.
Chapter 3: Operating the Tape Drive
Chapter 3 addresses operating procedures and controls and indicators.
Chapter 4: Care, Maintenance and Problem Resolution
Chapter 4 describes tape drive head cleaning, tape cartridge care, and provides
solutions to common tape drive and media problems.
Appendix A: Supplies
Appendix A provides ordering numbers for the tape head cleaning cartridge and
data cartridges.
Appendix B: Specifications
Appendix B lists the physical, electrical, and environmental specifications for the
TZS20 tape drive.

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Appendix C: Supported SCSI Messages and Commands
Appendix C lists TZS20 tape drive supported SCSI commands and messages.
Conventions
This guide uses the following conventions:
Table 1 Style Conventions
Style Meaning
boldface type For emphasis
italic type For emphasis and manual titles
monospace type Screen text, file names, path names,
directories, commands and utilities

EK–TZS20–UG. B01 1–1
1
Introduction
This chapter introduces and describes the TZS20 Cassette Tape Drive. There are four
TZS20 models: two embedded (internal) models, a tabletop (external) and an SBB
model.
1.1 Product Overview
The TZS20 tape drive is a high capacity data storage device which uses 8mm
Advanced Intelligent Tape (AIT) technology. It can store 25 GBs of data
(uncompressed) or 50 GBs (compressed, assuming a 2 to 1 compression ratio) on
a single tape cartridge.
The TZS20 interfaces to the host computer system by means of a single-ended,
68-pin, wide-SCSI connector. The drive achieves high data reliability through
read-after-write and an additional level of Error Correction Code.
TZS20 Features
• 25GB capacity (approximately 50GB to 75GB with Data Compression)
• Sustained transfer rate of 3 MByte/sec (6MByte/sec to 9MByte/sec with Data
Compression)
• AIT-1 Format
• Burst transfer rates of 12 MByte/sec asynchronous and 20 MByte/sec synchro-
nous
• A 4-MB buffer memory
• Three levels of Error Correction Code (ECC)
• High speed search rate (75 times normal read/write speed)
• Random read, append write, and N-Group write option
1.2 Data Compression
Tape cartridge capacity and transfer rate are increased by compressing data be-
fore writing it to the tape. The TZS20 uses the powerful ALDC data compression
algorithm. The AIT-1 Format allows both compressed and uncompressed data to
reside on the same tape.

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1.3 Operating System Support
TZS20 is fully supported by the following Operating Systems:
• OpenVMS Version 7.1 or higher
• DIGITAL UNIX Version 4.0A or higher (no SCSI ID greater than 7 for all
SCSI devices)
• Windows NT versions 4.0 (With DIGITAL provided NT driver or Microsoft
NT driver when available)
TZS20 is partially supported by following Operating Systems:
Operating System Revision Operating System Restriction
OpenVMS Lower than 7.1 No SCSI ID greater than 7 (all
SCSI devices)
DIGITAL UNIX 3.2G
4.0
No SCSI ID greater than 7 (all
SCSI devices) and no compression
support.
No SCSI ID greater than 7 (all
SCSI devices), no compression
support. Maximum block size is
64K.
Note: If the following message is seen on any version of DIGITAL UNIX, it
should be considered an informational message only. No action is required by the
user.
ctape_ioctl: unmapped scsi density code (0x30)-DDR entry needed

Chapter 1. Introduction
EK–TZS20–UG. B01 1–3
1.4 TZS20 Models
There are four TZS20 models:
• DS-TZS20-DB, tabletop, shown in Figure 1–1,
• TZS20-AB, 3 ½-inch embedded, front panel shown in Figure 1–2,
• TZS20-BB, 5 ¼-inch embedded,
• DS-TZS20-VW, SBB unit, shown in Figure 1–3.
Figure 1–1 DS-TZS20-DB Tabletop Tape Drive
Figure 1–2 Front View of TZS20-AB Embedded Tape Drive

TZS20 AIT Cassette Tape Drive – User’s Guide
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Figure 1–3 DS-TZS20-VB StorageWorks SBB Unit

EK–TZS20–UG. B01 2–1
2
Installing the Tape Drive
This chapter describes the unpacking and installation of the TZS20 AIT Cassette Tape
Drive, including instructions on how to set the SCSI ID.
2.1 Unpacking the Tape Drive
Before unpacking the unit, check the packing slip to ensure that the correct
equipment has been shipped. Inspect the shipping carton for damage. The carton
and packing material should be retained at the installation site for reshipment.
If you have the tabletop model the box contains the following items.
• The AIT Drive Unit,
• A Power Cable,
• A terminator,
• A cleaning cartridge,
• A media cartridge,
• A floppy disk with Windows NT 4.0 driver
• This Guide,
• Four rubber feet (for operating the drive in the upright position).
2.2 Installing the TZS20 Embedded (Internal) Tape Drive
Install the embedded tape drive as follows:
1. Shut down the operating system
2. Halt the system
3. Set all system power switches off.
4. Examine the space that you intend to mount the drive. The drive has
mounting holes on the sides and bottom of the unit. Please refer to your
system’s documentation for information on how to install the tape drive.
If the design of your computer case has slide tracks for rails on the sides of
mounted devices, use the proper screws and attach them to the sides of the
tape drive.

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5. The embedded (internal) tape drive is pre-configured as SCSI ID 5. If there
is a SCSI ID conflict in your system, you must change the jumper setting on
the jumper block on the back of the tape drive. Refer to Figure 2–1.
Figure 2–1 Setting the SCSI ID, Embedded Tape Drive
Parity default is enabled (jumper off).

Chapter 2. Installing the Tape Drive
EK–TZS20–UG. B01 2–3
Table 2–1 SCSI ID Jumper Settings
SCSI ID ID3 ID2 ID1 ID0
00000
10001
20010
30011
40100
50101
60110
70111
81000
91001
101010
111011
121100
131101
141110
151111
0 = Jumper Removed; 1 = Jumper On. Default setting is SCSI ID 5.
6. The option switches, located on the bottom of the drive, allow you to enable
active termination and terminator power. If you require terminator power,
set Option switch 5 to on; to enable active termination set switch 6 to on.
Refer to Figure 2–2 and Table 2–2 for switch settings.
7. Slide the tape drive into the computer case to make sure there are no
obstructions. Nothing should be forced. If rail mounting does not work,
examine how the disk drives have been mounted in your computer and
determine a way to mount the drive.
NOTE
Depending on the final location of your tape drive,
you may find it easier to plug the flat cable into the
tape drive before you install the drive in the
computer.
8. Thread the cable into the mounting area first and route it toward the adapter
board. Gently guide the cable as you push the drive into place. Handle the
ribbon cable carefully to prevent damage to the cable.
9. Before you mount the tape drive in the computer chassis, check to see that
you will be able to plug the DC power cable into the unit easily.

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10. Mount the tape unit to the computer chassis appropriately and plug the DC
power cable into the tape drive’s power connector, shown in Figure 2–1.
Mate the female connector with the drive’s connector and firmly push it all
the way into the drive’s connector.
11. If you have not already done so, connect the flat ribbon cable to the unit.
12. Replace the computer case cover, being careful not to snag or pinch any
cables. Plug the computer and peripherals back into their wall sockets.
Figure 2–2 Option Switch Settings
Table 2–2 Option Switch Descriptions
Option
Switch Default Position Description
1 OFF Selects Digital TZS20 mode.
2 OFF Reserved
3 OFF Reserved
4 OFF Reserved
5 ON Terminator power. Switch should be set to OFF if
drive is not at the end of the bus.
6 OFF Active bus termination. If tape drive is the last
device on the SCSI bus, should be set to ON
unless an external terminator is used.
7 ON Enables or disables compression. Default setting
is ON (compression enabled). Software can
override this setting.
8 OFF Reserved

Chapter 2. Installing the Tape Drive
EK–TZS20–UG. B01 2–5
2.3 Installing the DS-TZS20-DB Tabletop (External) Tape Drive
To install the DS-TZS20-DB tabletop model proceed as follows:
1. Shut down the operating system
2. Halt the system
3. Set all system power switches off.
Figure 2–3 Connecting the DS-TZS20-DB Tabletop Model

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4. Make sure the SCSI ID displayed in the window matches the SCSI ID
required by your system. To change the SCSI ID, make sure the unit is off
and press the top or bottom pushbutton until the correct SCSI ID is displayed
in the window.
5. Connect a wide-SCSI cable from the host computer’s SCSI adapter to one of
the connectors on the drive. Connect the other connector to the next device
on the bus; or, if the drive is the last device on the bus, connect a terminator
to the open connector. Refer to Figure 2–3.
6. Connect the power cord to the power receptacle.
2.4 Installing and Removing the SBB Tape Drive
Use the following procedure to install or remove the SBB tape drive.
1. Insert the replacement SBB into the guide slots and push it in until it is fully
seated and the mountingtabs lock into the shelf.
2. After power is applied, the LEDs should blink in sequence from left to right.
When the diagnostics are completed and if the media is loaded, the Tape
LED stays on (see Figure 3-1 to identify the Tape LED).
3. To remove the SBB tape drive press the two mounting tabs together to
release the SBB, and using both hands, pull the drive out of the shelf.
2.5 Verifying the Installation of the Tape Drive
2.5.1 Verifying the Installation at the Console Level
To verify that VMS/UNIX recognizes the tape drive, at the console prompt, enter
the command:
>>> SHOW DEVICE
An example of the screen display is as follows:
MKA100.1.0.9.0 MKA100 TZS20 xxxx
Where in the string 1.0.9.0, 1 indicates the ID, 0 the Bus, and 9 the slot number,
MKA100 is the system name for the drive, TZS20 is the device name and “xxxx”
will indicate the firmware revision.
NOTE
If the device is not recognized by the system, at
the console level enter the INIT command; then
re-enter the SHOW DEVICE command.