A T L A S 1 0 K 9 G B QUANTUM Native| Translation ------+-----+-----+----- Form 3.5"/HH Cylinders | | | Capacity form/unform 9000/ MB Heads | | | Seek time / track 5.0/ ms Sector/track | | | Controller ULTRA2 SCSI LVD Precompensation Cache/Buffer KB Landing Zone Data transfer rate MB/S int Bytes/Sector 512 160.000 MB/S ext Recording method operating | non-operating -------------+-------------- Supply voltage Temperature *C | Power: sleep W Humidity % | standby W Altitude km | idle W Shock g | seek W Rotation RPM 10000 read/write W Acoustic dBA spin-up W ECC Bit MTBF h Warranty Month Lift/Lock/Park YES Certificates ********************************************************************** G E N E R A L ********************************************************************** 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).