Agilent Technologies 85103E User manual

Agilent Technologies
85103E
Network Analyzer
Performance Upgrade
Installation Manual
Manufacturing Part Number: 85103-90013
Printed in USA
November 2002
Supersedes: July 2002
© Copyright 2001, 2002 Agilent Technologies, Inc.

ii
Notice
The information contained in this document is subject to change
without notice.
Agilent Technologies makes no warranty of any kind with regard to this
material, including, but not limited to, the implied warranties of
merchantability and fitness for a particular purpose. Agilent
Technologies shall not be liable for errors contained herein or for
incidental or consequential damages in connection with the furnishing,
performance, or use of this material.
Agilent Technologies assumes no responsibility for the use or reliability
of its software on equipment that is not furnished by Agilent
Technologies.
This document contains proprietary information which is protected by
copyright. All rights are reserved. No part of this document may be
photocopied, reproduced, or translated to another language without
prior written consent of Agilent Technologies.
Restricted Rights Legend
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
for DOD agencies, and subparagraphs (c)(1) and (c)(2) of the
Commercial Computer Software Restricted Rights clause at FAR
52.227-19 for other agencies.
Certification
Agilent Technologies certifies that this product met it’s published
specifications at the time of shipment from the factory. Agilent
Technologies further certifies that it’s calibration measurements are
traceable to the United States National Institute of Standards and
Technology (NIST, formerly NBS) to the extent allowed by the Institute’s
calibration facility, and to the calibration facilities of other
International Standards Organization members.

iii
Warranty
THE MATERIAL CONTAINED IN THIS DOCUMENT IS PROVIDED
"AS IS," AND IS SUBJECT TO BEING CHANGED, WITHOUT
NOTICE, IN FUTURE EDITIONS. FURTHER, TO THE MAXIMUM
EXTENT PERMITTED BY APPLICABLE LAW, AGILENT
DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED
WITH REGARD TO THIS MANUAL AND ANY INFORMATION
CONTAINED HEREIN, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. AGILENT SHALL NOT BE LIABLE
FOR ERRORS OR FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES IN CONNECTION WITH THE FURNISHING, USE, OR
PERFORMANCE OF THIS DOCUMENT OR ANY INFORMATION
CONTAINED HEREIN. SHOULD AGILENT AND THE USER HAVE
A SEPARATE WRITTEN AGREEMENT WITH WARRANTY TERMS
COVERING THE MATERIAL IN THIS DOCUMENT THAT
CONFLICT WITH THESE TERMS, THE WARRANTY TERMS IN
THE SEPARATE AGREEMENT WILL CONTROL.
Assistance
Product maintenance agreements and other customer assistance
agreements are available for Agilent Technologies products.
For assistance, refer to “Contacting Agilent” on page iv.

iv
Contacting Agilent
Any adjustment, maintenance, or repair of this product must be
performed by qualified personnel. Contact Agilent for assistance.
Online assistance: www.agilent.com/find/assist
United States
(tel) 1 800 452 4844, or
1 800 593 6635 for on-site
service of systems
Latin America
(tel) [phone]
(fax) [phone]
Canada
(tel) 1 877 894 4414
(fax) [phone]
Europe
(tel) ([phone]
(fax) ([phone]
New Zealand
(tel) 0 800 738 378
(fax) ([phone]
Japan
(tel) ([phone]
(fax) ([phone]
Australia
(tel) 1 800 629 485
(fax) ([phone]
Singapore
(tel) 1 800 375 8100
(fax) (65) 836 0252
Malaysia
(tel) 1 800 828 848
(fax) 1 800 801 664
Philippines
(tel) (632) 8426802
(tel) (PLDT subscriber only):
1 800 16510170
(fax) (632) 8426809
(fax) (PLDT subscriber only):
1 800 16510288
Thailand
(tel) outside Bangkok:
[phone]
(tel) within Bangkok:
[phone]
(fax) (66) 1 661 3714
Hong Kong
(tel) 800 930 871
(fax) (852) 2506 9233
Taiwan
(tel) 0800-047-866
(fax) (886) 2 25456723
People’s Republic of
China
(tel) (preferred):
800-810-0189
(tel) (alternate):
10800-650-0021
(fax) 10800-650-0121
India
(tel) 1-600-11-2929
(fax) 000-800-650-1101

v
Safety and Regulatory Information
Review this product and related documentation to familiarize yourself
with safety markings and instructions before you operate the
instrument. This product has been designed and tested in accordance
with international standards.
WARNING The WARNING notice denotes a hazard. It calls attention to a
procedure, practice, or the like, that, if not correctly performed
or adhered to, could result in personal injury. Do not proceed
beyond a WARNING notice until the indicated conditions are
fully understood and met.
CAUTION The CAUTION notice denotes a hazard. It calls attention to an
operating procedure, practice, or the like, which, if not correctly
performed or adhered to, could result in damage to the product or loss of
important data. Do not proceed beyond a CAUTION notice until the
indicated conditions are fully understood and met.
Instrument Markings
When you see this symbol on your instrument, you should refer to the
instrument’s instruction manual for important information.
This symbol indicates hazardous voltages.
The C-tick mark is a registered trademark of the Spectrum
Management Agency of Australia.
This symbol indicates that the instrument requires alternating
current (ac) input.
The CE mark is a registered trademark of the European Community.
If it is accompanied by a year, it indicates the year the design was
proven.
The CSA mark is a registered trademark of the Canadian Standards
Association.
1SM1-A This text indicates that the instrumentis an Industrial Scientific and
Medical Group 1 Class A product (CISPER 11, Clause 4).
ICES/NMB-001 This ISM device complies with Canadian ICES-001.
Cet appareil ISM est conforme a la norme NMB-001 du Canada.
This symbol indicates that the power line switch is ON.
This symbol indicates that the power line switch is OFF or in
STANDBY position.

vi
Safety Earth Ground
This is a Safety Class I product (provided with a protective earthing
terminal). An uninterruptible safety earth ground must be provided
from the main power source to the product input wiring terminals,
power cord, or supplied power cord set. Whenever it is likely that the
protection has been impaired, the product must be made inoperative
and secured against any unintended operation.
Before Applying Power
Verify that the product is configured to match the available main power
source as described in the input power configuration instructions in this
manual. If this product is to be powered by autotransformer, make sure
the common terminal is connected to the neutral (grounded) side of the
ac power supply.
Battery Information
The 8510C uses a lithium polycarbon monoflouridebattery to power the
instrument clock. The battery is located on the A7 I/O board of the
85101C display/processor. This battery is not field replaceable. Replace
the A7 I/O board if the battery requires replacement.
WARNING Danger of explosion if battery is incorrectly replaced. Replace
only with the same or equivalent type recommended. Discard
used batteries according to manufacturer’s instructions.

vii
Typeface Conventions
Italics • Used to emphasize important information:
Use this software only with the Agilent Technologies xxxxxX system.
• Used for the title of a publication:
Refer to the Agilent Technologies xxxxxX System-Level User’s Guide.
• Used to indicate a variable:
Type LOAD BIN filename.
Instrument
Display • Used to show on-screen prompts and messages that you will see on the display of an instrument:
The Agilent Technologies xxxxxX will display the message
CAL1 SAVED.
Keycap • Used for labeled keys on the front panel of an instrument or on a
computer keyboard:
Press Return.
[Softkey]• Used for simulated keys that appear on an instrument display:
Press [Prior Menu].
User Entry
• Used to indicate text that you will enter using the computer
keyboard; text shown in this typeface must be typed exactly as
printed:
Type LOAD PARMFILE
• Used for examples of programming code:
#endif//ifndef NO_CLASS
Path name • Used for a subdirectory name or file path:
Edit the file usr/local/bin/sample.txt
Computer Display • Used to show messages, prompts, and window labels that appear on
a computer monitor:
The Edit Parameters window will appear on the screen.
• Used for menus, lists, dialog boxes, and button boxes on a computer
monitor from which you make selections using the mouse or
keyboard:
Double-click EXIT to quit the program.

viii
What You’ll Find in This Manual...
Using this document and an Agilent Technologies 85103E upgrade
package, a trained Agilent Technologies service engineer can upgrade
an Agilent Technologies 8510A (with serial number below 03000) to full
Agilent Technologies 8510C capability.
Agilent Technologies does not recommend customer installation.
The Agilent Technologies 85103E performance upgrade package comes
with prepaid installation. Please contact Agilent to arrange fora service
engineer to install the upgrade kit. Refer to “Contacting Agilent” on
page iv.

Contents
Contents-ix
.85103E UpgradePackage
(8510A to 8510C)
Installing the Upgrade. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warranty Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Source Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Time Domain Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Procedure Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Checking 8510 System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Converting Files from Tape to Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Attended Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Storing a Binary Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Converting Cal Kit Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Installing a BNC Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Installing Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Rerouting Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Attaching New Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Upgrading an 8360 Source. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Reconnecting the System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Loading the 8510C Operating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Checking the 8510C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
85101C Functional Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
85102 Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
LO Phase Lock Out Functional Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Trigger In Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Time Domain Option Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Checking Calibration Kit Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Viewing Calibration Kit Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Loading a Calibration Kit Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Contents-x
Contents

1
85103E Upgrade Package
(8510A to 8510C)

2 85103E Performance Upgrade Installation Manual
85103E Upgrade Package (8510A to 8510C)
Installing the Upgrade
Installing the Upgrade
Use this package to upgrade an 8510A (with serial number below 03000) to an 8510C. With
this package, you will do the following:
• Check the 8510A operation.
• Transfer data from tape to disk.
• Install a BNC connector.
• Replace three printed circuit board assemblies.
• Reroute cables.
• Attach new labels.
• If required, upgrade the 8360.
• Reconnect the system.
• Load the 8510C operating system.
• Check the 8510C operation.
• Load and check the calibration kit definitions.
NOTE Agilent Technologies does not recommend customer installation of this
upgrade. The Agilent 85103E performance upgrade package comes with
prepaid installation. Refer to “Contacting Agilent” on page iv to arrange
for a service engineer to install the upgrade package.
Warranty Information
Installation of an upgrade does not affect the existing instrument warranty in any way.
Specifically, it does not extend the current instrument warranty. Any parts supplied in an
upgrade package carry a 90-day replacement-part warranty.
Source Compatibility
For complete compatibility with revision C.07.00 or greater firmware, your source must be
an Agilent 8360 series source. If an 8360 series source is not used, power domain and
receiver calibration functions will not work.
The 8510C works with all 8360 synthesized sweeper models. However, some 8360
instruments must be upgraded to take advantage of two 8510C system features (quick step
mode and test port power flatness correction). Refer to “Upgrading an 8360 Source.”
NOTE Agilent 8340, 8341, and 8350 series sources are out of support life and
are no longer recommended for use in 8510C systems.
Please consult with your Agilent customer engineer for more information on upgrading a
network analyzer and source firmware.

85103E Performance Upgrade Installation Manual 3
85103E Upgrade Package (8510A to 8510C)
Installing the Upgrade
Performance Verification
Performance verification of the system is not included in the upgrade package. If you wish
to do a performance verification of your upgraded system, this additional service can be
arranged with the Agilent service engineer installing your upgrade.
NOTE A functional check of the 85101C and the 85102 is performed in the
section “Checking the 8510C” on page 25.
Time Domain Option
If your existing 8510 is equipped with the time domain option (Option 010), either
originally or through an upgrade, then the upgrade package that was ordered should also
be equipped with Option 010. (If there is a discrepancy, contact the Agilent sales engineer
who placed the order.) Refer to “Time Domain Option Functional Check” on page 30 to
verify that it has been properly installed.

4 85103E Performance Upgrade Installation Manual
85103E Upgrade Package (8510A to 8510C)
Installing the Upgrade
Procedure Overview
Step 1. Check the upgrade package contents.
Refer to Table 1. If an item is missing, refer to “Contacting Agilent” on page iv for
assistance.
Step 2. Assemble items not included in the upgrade package.
If needed, obtain the required items listed in Table 2 for your upgrade that are not
supplied in this package.
Step 3. Be sure you have a static-safe work station.
Check for the following:
• The static mat sits on a clean, flat, sturdy surface.
• The static mat has a connection to earth ground.
• The static mat has a wrist strap connected to it.
Step 4. Familiarize yourself with the upgrade process.
Refer to “Installing the Upgrade” for an overview of the required upgrade steps.
Step 5. Follow the upgrade instructions.
Follow the detailed instructions provided, beginning with “Checking 8510 System
Operation” on page 8 to install and check your upgrade installation.
Step 6. Dispose of the replaced 85101C display/processor.
Recycle or dispose of the 85101C display/processor according to your state or local
requirements. The battery on the A7 I/O board and the A11 display (CRT) may have
special requirements. When disposing of the cathode ray tube (CRT display), observe the
following precautions:
WARNING The CRT can pose a shock hazard if not properly discharged.
Explosion or implosion of the CRT may cause personal injury.
Only a properly trained individual should release the vacuum.

85103E Performance Upgrade Installation Manual 5
85103E Upgrade Package (8510A to 8510C)
Installing the Upgrade
Table 1 85103E Upgrade Package Contents
Item Quantity Part Number
Assemblies
A16 remote applications
A20 sweep ADC
A23 main phase lock
85102 emulator
1
1
1
1
85102-60235
85102-60234
85102-60240
85101-60209
Tools
0.655-inch countersink drill bit
Rear panel hole alignment guide
Self-adhesive foam tape (2.5 ft)
9/16-inch nut driver
SMB connector remover
1
1
1
1
1
8920-0388
85103-00001
0460-0114
8720-0008
85103-00002
Labels
LO phase lock out
Trigger In
8510C network analyzer (aluminum panel)
8510C network analyzer (plastic panel)
A20J2
Serial tag (old) Sys #
Serial tag (new)
Installation date (A to C)
1
1
1
1
1
1
1
2
08510-80019
08510-80020
08510-80030
85102-80118
9320-5875
5180-8444
9320-5959
9320-5958
Connector Parts
BNC connector body
15/32-inch hex nut
Internal star washer
Shouldered insulating washer
Flat washer
BNC cap (short)
Plastic SMB connector cover
1
1
1
2
2
1
1
1250-1091
0590-1251
2190-0102
00310-48801
3050-1094
1250-0929
1401-0050
Cables
W40 A16J6 to rear panel J9
W42 A16J5 to A23J1
SMB(f) to BNC(m)
Gray cable tie
White cable tie marker
85101C cables:
BNC (2)
GPIB (1)
IF Display Interconnect (1)
RS-232 (1)
1
1
1
5
1
5
85102-60249
85102-60248
5062-7230
1400-0493
1400-0836
p/o 85101C
Software
8510C software kit contains:
Performance/verification disk
Master cal constants disk
Service adjustments disk
Software tool kit disk
Operating system disk for 8510C
Blank data disks (2 black, 2 gray)
1
1
1
1
1
4
p/o 85101C
85101-60271
08510-10033
08510-10034
08510-10024
85103-10002
85101-80116
85103-60002

6 85103E Performance Upgrade Installation Manual
85103E Upgrade Package (8510A to 8510C)
Installing the Upgrade
Documentation
Upgrade Installation Manual
8510C Manual set contains:
8510C Keyword Dictionary
8510C Operating and Programming Manual
8510C On-Site Service Manual
1
1
1
1
85103-90013
p/o 85101C
08510-90275
08510-90280
08510-90281
08510-90282
Miscellaneous
SMB adapter tee
Safety glasses
Masking tape
Clear plastic sheet (chip shield)
7-inch rack mount flange kit (w/o handles)
85102 service adapter
85101C display processor
Accessory tray
DISC key
USER PRESET key
2
1
1
1
1
1
1
1
1
1
1250-1391
9300-0914
0460-0030
85103-20001
5062-4072
85102-60210
85101C
08510-40001
5041-4512
5041-4903
Table 1 85103E Upgrade Package Contents (Continued)
Item Quantity Part Number

85103E Performance Upgrade Installation Manual 7
85103E Upgrade Package (8510A to 8510C)
Installing the Upgrade
Table 2 Equipment Required But Not Supplied
Item Agilent Part Number
Source 8360-series
Test Set 8511A/B, 8514B, 8515A, 8517A/B, or 85110A/L
Static control table mat 9300-0797
Wrist strap 9300-1367
Wrist-strap-to-mat cord (5 ft) 9300-1980
Small Pozi-drive screwdriver (#1) 8710-0899
Medium Pozi-drive screwdriver (#2) 8710-0900
Torx T-15 screwdriver 8710-1622
1/2-inch open-end wrench 8720-0025
5/16-inch open-end wrench 8720-0015
7/16-inch open-end wrench 8720-0017
Wire cutters 8710-0012
Flat blade screwdriver 8730-0001
Plastic-tipped hammer 8740-0002
Center punch 8890-0001
BNC to BNC cable 10503A
Disk drive 9122C
Controller HP 9000 series 200/300aor PC
a. Except for an 9826A.
GPIB cables 10388A
Variable speed electric drill (3/8 in)
Pocket knife or scissors
Alligator clip leads
For 8511A Only:
Power splitter 5086-7408
Semirigid cable 08510-20005b
b. From an 8510 service kit or 8511A test set.
Semirigid cable 08510-20006b

8 85103E Performance Upgrade Installation Manual
85103E Upgrade Package (8510A to 8510C)
Checking 8510 System Operation
Checking 8510 System Operation
Use this procedure to ensure that the 8510A system works properly.
Procedure
1. Configure the system as shown in Figure 1.
2. Turn on the instruments in the following order:
a. Source (be sure to turn the switch to power on, not standby)
b. Test set
c. Analyzer
3. On the 85102, press the green preset key.
4. Does the system pass self-test (85101 self tests, 85102 running error messages, and test
set unratio power tests) and display a log MAG S11 trace? If not, do not perform the
upgrade until the system has been serviced.
5. Initialize a blank or used tape (customer supplied), as follows:
a. Load the tape (with write-protect off).
b. On the 85102, press AUXILIARY MENUS TAPE.
c. On the 85101, select INITIALIZE TAPE YES.
6. Does the system initialize the tape (this takes approximately three minutes) and
display TAPE INITIALIZED?
NOTE The tape drive must be working to transfer information from tape to
disk.
7. If the system displays a self-test,1running error message, or unratio power test failure,
check the equipment setup. Do not perform the upgrade until either you correct the
setup problem, or you have the system serviced.
8. Continue with “Converting Files from Tape to Disk.”
1. You may have to rely on the red LEDs rather than the display.

85103E Performance Upgrade Installation Manual 9
85103E Upgrade Package (8510A to 8510C)
Checking 8510 System Operation
Figure 1 Typical Equipment Setup and 8511A-Specific Connections

10 85103E Performance Upgrade Installation Manual
85103E Upgrade Package (8510A to 8510C)
Converting Files from Tape to Disk
Converting Files from Tape to Disk
Each performance upgrade package includes a tape to disk conversion program. Use this
program to convert DATA, MEMORY, MEMORY ALL, and DELAY TABLE files from tape
to disk. This conversion will make these files available to the 8510C.
The utility program creates CITIfile versions of the tape files on a standard double-sided
(720 kByte) or a high-density (1.4 MByte) 3.5-inch diskette. For best performance, we
recommend that you use a 9122C drive and high-density diskettes.
NOTE You cannot convert instrument and hardware state files, or calibration
kit files under this procedure. Refer to “Converting Cal Kit Files” at the
end of this procedure. The 8510C cannot use the learn strings of earlier
analyzer versions.
Procedure
1. Connect the equipment as shown in Figure 2.
2. Turn the equipment on.
3. On the 8510, press INSTRUMENT STATE RECALL and select [MORE], [FACTORY PRESET].
Figure 2 Equipment Setup for Data Transfer
4. Insert the Software Tool Kit disk included in the upgrade kit into drive 0 of the 9122
disk drive.