General Description - Seagate ST39173N Product Manual

Barracuda 9LP Product Manual, Rev. C
3.0

General description

Barracuda 9LP drives combine magnetoresistive (MR) heads, partial response/maximum likelihood (PRML)
read channel electronics, embedded servo technology, and a SCSI-3 (Fast-20 and Fast-40) interface to provide
high performance, high capacity data storage for a variety of systems including engineering workstations, net-
work servers, mainframes, and supercomputers.
Fast-20 and Fast-40 (also known as Ultra-1 SCSI and Ultra-2 SCSI, respectively) are negotiated transfer rates.
These transfer rates will occur only if your host adapter also supports these data transfer rates. This drive also
operates at SCSI-1 and SCSI-2 data transfer rates for backward compatibility with non-Fast-20/Fast-40 capa-
ble SCSI host adapters.
Table 1 lists the features that differentiate the various Barracuda 9LP models.
Table 1: Drive model number vs. differentiating features
Number
Model number of heads
ST39173N 10
ST39173W 10
ST39173WD 10
ST39173LW 10
ST39173WC 10
ST39173LC 10
ST34573N 5
ST34573W 5
ST34573WD 5
ST34573LW 5
ST34573WC 5
ST34573LC 5
[1] See Section 9.6 for details and definitions.
The drive records and recovers data on 3.5-inch (86 mm) non-removeable discs.
The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI-2/SCSI-3
SPI-2 interface specifications to the extent described in this manual (volume 1), which defines the product per-
formance characteristics of the Barracuda 9LP family of drives, and the SCSI Interface Product Manual (vol-
ume 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.
Number of I/O
I/O circuit type [1] connector pins
single-ended 50
single-ended 68
differential (HVD) 68
differential (LVD) 68
single-ended 80
differential (LVD) 80
single-ended 50
single-ended 68
differential (HVD) 68
differential (LVD) 68
single-ended 80
differential (LVD) 80
Number of I/O
data bus bits
8
16
16
16
16
16
8
16
16
16
16
16
5