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Fabricant : Seagate
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Nom Fichier : 29250a.pdf
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Other customers should contact their place of purchase. Seagate offers comprehensive customer support for all Seagate drives. These services are available worldwide. Location Phone number FAX number Asia Pacific and Australia 65-485-3595 65-488-7503 Europe, Middle East, and Africa 31-2031-67300 31-2065-34320 Japan 81-3-5462-2904 81-3-5462-2979 USA 1-800-468-3472 405-949-6740 Other Americas (Brazil, Canada, Mexico) 405-949-6706 405-949-6738 Cheetah 18 Installation Guide, Rev. A Location Phone number FAX number Manufacturer’s representatives Brazil MA Informatica 55-21-516-6649 55-21-516-5280 Canada Memofix 905-660-4936 905-660-8738 Adtech 905-812-8099 905-812-7807 1-800-624-9857 Mexico Abicom Seamax SA DE CV 525-546-4888 525-546-4888 Southern Europe Caesar Italia 39-688-18149 39-688-02103 Cheetah 18 Installation Guide, Rev. A General description Cheetah 18 SCSI disc drives are high-speed, random-access digital-data storage devices capable of operating in single-ended (SE) or low voltage differential (LVD) modes. These two modes are offered to allow you to use this drive in systems that use the traditional SE technology or to use it in LVD-capable systems. Refer to page 20 for additional information about LVD technology. The drive is a component for installation in an enclosure designed for the drive. This is often a rack within the system or an external enclosure designed to house one or more disc drives or other peripheral units. In either case, the disc drive must receive adequate cooling (refer to “Providing adequate cooling”) and it must be sufficiently grounded and shielded from emissions. The Cheetah 18 Product Manual (part number 83329260) contains guidelines for a properly designed enclosure. Attention. This high performance Cheetah disc drive must have proper power and cooling for reliable operation. Cheetah 18 Installation Guide, Rev. A Figure 1. Cheetah 18 family drive (ST118202LW shown) Cheetah 18 Installation Guide, Rev. A Characteristics ST118202LW/LC Interface Ultra2 SCSI1 Capacity Unformatted (Gbytes) 22.54 Formatted (Gbytes)2 18.21 Recording Cylinders (user) 6,962 Read/write data heads 24 Avg bytes/track 104,840-159,008 Access time3 Average read (msec) 5.9 Average write (msec) 6.7 Disc rotation RPM 10,025 Average latency (msec) 2.99 Synchronous data transfer rate Maximum instantaneous (Mbytes/sec) 40 (SE mode) 80 (LVD mode) Asynchronous data transfer rate Maximum instantaneous (2 bytes wide)10.0 (Mbytes/sec) Multi-segmented cache (kbytes) 1,024 standard 4,096 optional 1. Also operates per SCSI-1/SCSI-2/SCSI-3 protocols. 2. The specified formatted capacities are calculated with the standard OEM sector size (512 bytes per logical block) and sparing. 3. Includes on-board controller overhead. Cheetah 18 Installation Guide, Rev. A ST118202LW/LC Low voltage Single-ended (SE) differential (LVD) mode mode DC power requirements (±5%)1 +5 V +12 V +5 V +12 V Maximum start current 0.89A 2.5A 0.90A 2.5A Maximum operating current 0.88A 1.22A 0.95A 1.22A Average idle current 0.72A 0.98A 0.74A 0.98A 1. For more detailed power information, refer to the Cheetah 18 Product Manual, publication number 83329260. Cheetah 18 Installation Guide, Rev. A Initial setup information The general information beginning on this page applies to all of the Cheetah 18 drive models. After reading the general information topics, refer to the appropriate drive-specific section listed below for additional information about configuring and installing your particular model. Drive models Page ST118202LW 39 ST118202LC 45 General information The following general information topics are discussed: • Single-ended and low voltage differential modes • SCSI ID jumpers • Drive termination • Terminator power • Interface drivers and data path width notes • Other applicable jumper options • Providing adequate cooling • Mounting the drive and connecting cables1 • Formatting the drive 1This mounting procedure does not apply to “LC” model drives. To mount an “LC” drive, plug the drive into the system’s single connector attachment (SCA) position on the system’s back panel. Cheetah 18 Installation Guide, Rev. A Single-ended and low voltage differential modes This drive incorporates two different transceivers to allow you to use it in traditional systems which may use single-ended (SE) drivers and receivers, or to use it in low voltage differential (LVD) capable systems which use LVD drivers and receivers. You can configure the drive to switch between SE and LVD modes automatically or force it to operate in SE mode only as described later in this guide. LVD technology enhances parallel SCSI I/O performance, reduces power consumption, increases allowable cable lengths, and improves device connectivity beyond SE capabilities. Note. To operate at the Ultra2 SCSI rates in LVD mode, all devices on the same bus must be running in LVD mode. If you add any single-ended device to a bus that is operating in LVD mode, all devices drop back to operating in single...