Seagate ST3146854LC Cheetah 15K.4 SCSI Product Manual - Page 17
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UPC - 000056921496
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3.0 General description Cheetah 15K.4 SCSI drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood (PRML) read channel electronics, embedded servo technology, and a wide Ultra320 SCSI interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers. Ultra320 SCSI use negotiated transfer rates. These transfer rates will occur only if your host adapter supports these data transfer rates and is compatible with the required hardware requirements of the I/O circuit type. This drive also operates at SCSI-1 and SCSI-2 data transfer rates for backward compatibility with non-Ultra/Ultra2/ Ultra160/Ultra320 SCSI host adapters. Table 1 lists the features that differentiate the Cheetah 15K.4 SCSI models. Table 1: Drive model number vs. differentiating features Model number ST3146854LW ST373454LW ST336754LW ST3146854LC ST373454LC ST336754LC Number of active heads 8 4 2 8 4 2 I/O circuit type [1] Single-ended (SE) and low voltage differential (LVD) Single-ended (SE) and low voltage differential (LVD) Number of I/O connector pins 68 80 [1] See Section 9.6 for details and definitions. The drive records and recovers data on approximately 70 mm non-removable discs. The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI interface specifications to the extent described in this manual (volume 1), which defines the product performance characteristics of the Cheetah 15K.4 SCSI family of drives, and the SCSI Interface Product Manual (volume 2), part number 75789509, which describes the general interface characteristics of this and other families of Seagate SCSI drives. The drive's interface supports multiple initiators, disconnect/reconnect, self-configuring host software, and logical block addressing. The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a nonreplaceable filter to maintain a contamination-free HDA environment. Never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actuator, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids your warranty. Cheetah 15K.4 SCSI Product Manual, Rev. D 7