Seagate ST39102LC Product Manual - Page 15
General description - scsi adapter
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Cheetah 9LP Product Manual, Rev. C 5 3.0 General description Cheetah 9LP drives combine magnetoresistive (MR) heads, partial response/maximum likelihood (PRML) read channel electronics, embedded servo technology, and a wide Ultra2 SCSI interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers. Ultra SCSI and Ultra2 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 SCSI host adapters. Table 1 lists the features that differentiate the two Cheetah 9LP models. Table 1: Drive model number vs. differentiating features Model number Number of heads I/O circuit type [1] Number of I/O connector pins Number of I/O data bus bits ST39102LW 12 Single-ended (SE) and low voltage 68 16 ST34502LW differential (LVD) ST39102LC 12 Single-ended (SE) and low voltage 80 16 ST34502LC differential (LVD) [1] See Section 9.6 for details and definitions. The drive records and recovers data on approximately 3.0-inch (84 mm) non-removeable discs. The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI-2/SCSI-3 interface specifications to the extent described in this manual (volume 1), which defines the product performance characteristics of the Cheetah 9LP family of drives, and the SCSI Interface Product Manual (volume 2), part number 77738479, 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 automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets (logical block addressing is used). 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. Refer to Figure 2 for an exploded view of the drive. This exploded view is for information only-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 9LP drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the landing zone when power is removed. An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and handling. The shipping lock automatically disengages when power is applied to the drive and the head load process begins. Cheetah 9LP drives decode track 0 location data from the servo data embedded on each surface to eliminate mechanical transducer adjustments and related reliability concerns. A high-performance actuator assembly with a low-inertia, balanced, patented, straight-arm design provides excellent performance with minimal power dissipation.