Seagate QUANTUM ATLAS II User Manual
Overview
Quantum Atlas™II 3.5-inch, 7,200 RPM
hard disk drives are top-performing
storage devices that meet the needs of
high-end storage subsystems, video
servers, and workstations. The drives
offer high capacity and feature the most
advanced technology for exceptional
performance and higher areal density.
With formatted capacities of 4,550
megabytes (MB) and 9,100 MB, and an
Ultra SCSI-3* (Wide 40 MB per second
data transfers) interface, Quantum Atlas II
disk drives are outstanding mass storage
solutions for applications requiring the
fastest data throughput. Systems that
can benefit from the family’s stunning
performance include RAIDs, database
servers, video servers, technical workstations, and video editing systems.
Optimized performance features
include a custom SCSI controller, a
sophisticated seek optimization algorithm,
an embedded quadrature servo system,
and a large multi-track segmented cache.
Quantum Atlas II drives have the industry’s fastest seek time for a 9.1 gigabyte
(GB) drive at 8 milliseconds (ms).
Magnetoresistive (MR) heads on the
drives push areal density to 910 MB per
disk. In addition, Quantum’s highly automated manufacturing process ensures the
industry’s highest reliability for its class.
Because Quantum Atlas II drives are
used to store mission-critical data, they
are extremely reliable. The drives have
a reduced parts count, low power consumption, and high data integrity.
Hi ghest-Performing Driv e s fo r Storage
Subsystems, Servers, and Works tations
Key Features
• 4.55 GB and 9.10 GB
formatted capacities
• 7,200 RPM
• 8 ms average seek time
• Ultra SCSI-3 interface
• MR heads
• Tagged command queuing
• ORCA
™
seek optimization
algorithm
• Zero-latency read
• Multi-block read/write
data transfers
• Automatic sector reallocation
• Adaptive segmented buffer
• Hot pluggable
• Low command overhead
• ID-less controller
• Downloadable firmware
• Robust multi-initiator support
• Automatic power manage-
ment
• Advanced ECC on-the-fly
• Write splice protection
• Plug-and-Play SCSI
QUANTUM ATLAS II
4.5S/9.1
S
Advanced SCSI Architecture a nd
Cache Perform ance
Quantum’s custom ASABET™SCSI
controller provides exceptionally low
command overhead and reduced
SCSI-bus execution times, as an unprecedented number of functions are
automatically executed in hardware.
The Quantum Atlas II family features
a large cache and a unique cachemanagement algorithm that maximizes
cache hits for multiple sequential read
streams. The result is fast data access
and high system throughput.
The drives employ an advanced
embedded quadrature servo system that
continuously compensates for temperature changes, eliminating the need for
thermal recalibrations that interrupt
audio/video data streams.
Exceptional Data Integrity and
Reliability
Quantum drives have the highest data
integrity in the industry. Data from the
SCSI bus to the media is protected with
an Error-Detection Code (EDC). In addition, Quantum incorporates a powerful
Reed Solomon Error-Correction Code
(ECC) capable of correcting a single
73-bit error burst for each sector.
*SCSI-3 SPI compliant.
SPECIFICATIONS
For Mo re Informa tion
For more information about Quantum's quality products, call
toll-free: 1-800-624-5545 in the U.S.A. and Canada, or visit our
World Wide Web site: http://www.quantum.com
Specifications subject to change without notice.
©1997 Quantum Corporation. All rights reserved. Quantum and the Quantum logo
are trademarks of Quantum Corporation, registered in the U.S.A. and other countries.
Capacity for the Extraordinary, Quantum Atlas, ASABET, and ORCA are trademarks of
Quantum Corporation. Products mentioned herein are for identification purposes only
and may be trademarks or registered trademarks of their respective companies.
Printed in the U.S.A. 60k DF/CRFTSMN atlds
797
Quantum Atlas II 4.5 9.1
Form Factor 3.5 inch
Interface Ultra SCSI-31single-ended
Narrow 50-pin connector
Wide 68-pin connector
SCA-2 80-pin connector
Fast SCSI differential
Wide 68-pin connector
Formatted Capacity (MB2) 4,550 9,100
Disk Drive Configuration
Disks 5 1 0
Heads/Recording Surfaces 10 20
Tracks per Surface 5,811
Sectors per Track 108 to 180
Bytes per Sector 512
Track Density (tpi) 6,000
Maximum Recording Density (bpi) 109,800
Areal Density (Mb/sq. in.) 659
Encoding/Detection Method RLL (1,7)
Performance Specifi cations
Typical Seek Times3(ms)
Average (read) 8
Track-to-Track 1.0
Full Stroke <18
Average Rotational Latency (ms) 4.17
Rotational Speed (RPM) 7,200
Internal Data Rate (Mb/sec) 121
Data Transfer Rates (Buffer-to-Host)
Ultra SCSI-3 (MB/sec)
Narrow 20 20
Wide 40 40
Buffer Size (KB) 512 1,024
Reliability Specifications
Preventive Maintenance Not required
Data Errors (per bits read)
Recoverable <1 per 10
11
Nonrecoverable <1 per 10
15
Error-Correction Method Reed Solomon
Warranty4(years) 5
4.5 9.1
Physical Spe cificati ons
Dimensions—inches (mm)
Width 4.0 (101.6)
Length 5.75 (146.05)
Height 1.0 (25.4) 1.63 (41.4)
Weight—pounds (kg) 1.2 (0.55) 2.0 (0.9)
Environmental Limits
Operating
Temperature (°C) 5 to 55
Non-Condensing Humidity (%) 10 to 90
Shock (G,11ms) 15
Vibration (G, 22 to 375 Hz,
peak-to-peak) 0.5
Typical Audible Noise
(dba @ 1 m, any direction, idle) 34 36
Non-Operating
Temperature (°C) -40 to 66
Non-Condensing Humidity (%) 5 to 95
Power Specifica tions
Power Requirement
+5V DC±5% Seeking (A, typ) 0.6 0.6
+12V DC±5% Seeking (A, typ) 0.7 1.2
Typical Power Draw (W)
Idle (SCSI) 9.0 12.0
Peak Current (mA on +12) 1,850 2,350
1
SCSI-3 SPI compliant.
2
Quantum defines a megabyte (MB) as 106or 1,000,000 bytes.
3
Seek times are at nominal environmental conditions and include settling.
4
This warranty is standard when products are purchased directly through
authorized Quantum distributors/dealers. Unless otherwise agreed, a one-year
warranty is provided to all OEMs purchasing directly from Quantum.
End-user warranties provided by computer manufacturers may vary.
Quantum Corpora tion
500 McCarthy Boulevard
Milpitas, California 95035 U.S.A.
1-800-624-5545
http://www.quantum.com
Quantum Peripheral Products S.A.
ICC Building D
20 Route de Pre-Bois
1215 Geneva, Switzerland
41-22-929-7600
Quantum Asia-P ac i fic Pte. Ltd.
9 Temasek Boulevard
#24-00/Suntec City Tower 2
Singapore 038989
65-334-0880
Quantum Peripherals Japan
Shinjuku Square Tower 4F
6-22-1 Nishi-Shinjuku
Shinjuku-ku, Tokyo, 163-11 Japan
81-3-5321-7900
Loading...