Cheetah X15 36Lp Product Manual, Rev. D; General Description - Seagate ST336732LC Product Manual

Cheetah X15 36LP Product Manual, Rev. D

3.0

General description

Cheetah X15 36LP drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood
(PRML) read channel electronics, embedded servo technology, and a wide Ultra160 SCSI interface (on
ST336752 and ST318452 models) or a wide Ultra320 SCSI interface (on ST336732 and ST318432 models) to
provide high performance, high capacity data storage for a variety of systems including engineering worksta-
tions, network servers, mainframes, and supercomputers.
Ultra160 and 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 X15 36LP models.
Table 1: Drive model number vs. differentiating features
Number
of active
Model number heads
ST336752LW 8
ST318452LW 4
ST336752LC 8
ST318452LC 4
ST336732LW 8
ST318432LW 4
ST336732LC 8
ST318432LC 4
[1] See Section 9.6 for details and definitions.
The drive records and recovers data on approximately 2.5-inch (65 mm) non-removeable 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 X15 36LP 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 X15 36LP 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.
I/O circuit type [1]
Single-ended (SE) and low
voltage differential (LVD)
Single-ended (SE) and low
voltage differential (LVD)
Single-ended (SE) and low
voltage differential (LVD)
Single-ended (SE) and low
voltage differential (LVD)
Number of I/O
connector pins Ultra160
68 X
80 X
68
80
5
Interface
Ultra320
X
X