Seagate Cheetah 9LP Series, Руководство по эксплуатации продукта

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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 perfor-
mance, high capacity data storage for a variety of systems including engineering workstations, network serv-
ers, 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
[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 perfor-
mance 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 non-
replaceable 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 disassem-
ble 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 possi-
bility 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 dur-
ing 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.
Model number
Number
of heads
I/O circuit type [1]
Number of I/O
connector pins Number of I/O
data bus bits
ST39102LW
ST34502LW 12 Single-ended (SE) and low voltage
differential (LVD) 68 16
ST39102LC
ST34502LC 12 Single-ended (SE) and low voltage
differential (LVD) 80 16