General Description - Seagate ST373453LC - Cheetah 73.4 GB Hard Drive Product Manual

Cheetah 15K.3 SCSI Product Manual, Rev. G
3.0

General description

Cheetah 15K.3 SCSI drives combine giant magnetoresistive (GMR) heads, partial response/maximum likeli-
hood (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 worksta-
tions, 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.3 SCSI models.
Table 1: Drive model number vs. differentiating features
Number of
Model number active heads
ST373453LW 8
ST336753LW 4
ST318453LW 2
ST373453LC 8
ST336753LC 4
ST318453LC 2
[1] See Section 9.6 for details and definitions.
The drive records and recovers data on approximately 2.5-inch (65 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 char-
acteristics of the Cheetah 15K.3 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
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.
Never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actu-
ator, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids
your warranty.
Cheetah 15K.3 SCSI 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 dur-
ing shipping and handling. The shipping lock automatically disengages when power is applied to the drive and
the head load process begins.
Cheetah 15K.3 SCSI 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.
I/O circuit type [1]
Single-ended (SE) and low voltage
differential (LVD)
Single-ended (SE) and low voltage
differential (LVD)
Interface
Number of I/O
connector pins Ultra320
68 X
80 X
5