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Cheetah 10K.7 SCSI Product Manual, Rev. D 7
3.0 General description
Cheetah 10K.7 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 ] data storage for a variety of systems including engineering workstations, net-
work servers, mainframes, and supercomputers.
Ultra320 SCSI uses 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/
Ultra320 SCSI host adapters.
Table 1 lists the features that differentiate the Cheetah 10K.7 SCSI models.
[1] See Section 9.6 for details and definitions.
The drive records and recovers data on approximately 84 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 10K.7 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 log-
ical block addressing.
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.
Table 1: Drive model number vs. differentiating features
Model number
Number of active
heads I/O circuit type [1]
Number of I/O
connector pins
ST3300007LW
ST3146707LW
ST373207LW
8
4
2
Single-ended (SE) and low voltage differential (LVD) 68
ST3300007LC
ST3146707LC
ST373207LC
8
4
2
Single-ended (SE) and low voltage differential (LVD) 80