
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                                  

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                      G   E   N   E   R   A   L
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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).


