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Hard Drive: QUANTUM: ATLAS IV 18.2 U160/M 18200MB 3.5"/SL ULTRA160/M




A T L A S   I V   1 8 . 2   U 1 6 0 / M    QUANTUM
                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders        |     |     |
Capacity form/unform 18200/      MB        Heads           8|     |     |
Seek time   / track   6.9/ 0.8 ms          Sector/track     |     |     |
Controller           ULTRA 160/M SCSI      Precompensation
Cache/Buffer          2000 KB              Landing Zone
Data transfer rate   20.000 MB/S int       Bytes/Sector      512
                    160.000 MB/S ext
Recording method     24/25 PRML                     operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 70
Power: sleep              W     Humidity     %        10 90    |      5 95
       standby            W     Altitude    km                 |
       idle           8.6 W     Shock        g                 |    200
       seek               W     Rotation   RPM      7200
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   352 REED SOLOMON
                                MTBF         h
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates                                  

General

QUANTUM ULTRA160/M SCSI

What is Ultra160/m SCSI?
------------------------
The ANSI standards T10 committee is revising the SCSI Parallel
Interface (SPI-3). This document is the basis of the Ultra160/m SCSI
technology. Evolutionary changes have been made to the existing
SCSI protocol (SPI-2) to increase performance, manageability, and
reliability. All changes are incremental, and existing SCSI
protocols are maintained for backward compatibility. Three new
underlying components of Ultra160/m SCSI are Double Transition
Clocking, Cyclical Redundancy Checks (CRC), and Domain Validation.

What technology Enables Ultra160/m SCSI?
----------------------------------------
Ultra160/m SCSI doubles transfer rates to 160 Megabytes per second
by using both edges of the request/acknowledge signal to clock data.
This creative solution provides designers with the choice of
improving speed, reliability or connectivity. It allows system
designers to choose bus bandwidths up to 160 MB/second using
existing Ultra2 SCSI cable plants. Alternatively, this technology
lets designers maintain Ultra2 SCSI speeds (80 MB/second) and
improve reliability by lowering clock speed, allowing more margin for
ASICs and cables.

Other Ultra160/m SCSI improvements include automatic tests of the
interface's performance level for increased manageability and the
addition of CRC for reliable data transmission. When Ultra160/m SCSI
is used with LVD signaling, cable lengths of 12 meters are maintained
providing full backward compatibility.

Double Transition Clocking
--------------------------
Double transition clocking changes the digital protocol to use
both edges of the SCSI request/acknowledge signal to clock data.
Data transfer rates can be doubled simply by increasing the speed of
only the data lines. For example, request/acknowledge signal on
Ultra2 SCSI runs at 40 MHz, while data runs at only 20 MHz, or 80
MB/second on a 16-bit wide bus. By using both edges of the same 40
MHz request/acknowledge signal, the data rate can be increased
to 40 MHz, or 160 MB/second on a 16-bit wide bus.

Choosing the Speed Advantage with Double Transition Clocking
Double Transition Clocking doubles the Ultra2 SCSI data transfer
rates from 80 MB/second to 160 MB/second. Interface bandwidth is
an essential ingredient for Windows NT and UNIX workstations, video
and web servers, and storage area networks (SANs).













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