General Description - Seagate ST318436LW Product Manual

Barracuda 18XL Product Manual, Rev. A
3.0

General description

Barracuda 18XL drives combine magnetoresistive (GMR) heads, partial response/maximum likelihood (PRML)
read channel electronics, embedded servo technology, and a SCSI-3 (Fast-20, Fast 40, and Fast-80) interface
to provide high performance, high capacity data storage for a variety of systems including engineering worksta-
tions, network servers, mainframes, and supercomputers.
Fast-20, Fast-40, and Fast-80 (also known as Ultra SCSI, Ultra-2 SCSI, and Ultra160 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/Fast-80 capable SCSI host adapters.
Table 1 lists the features that differentiate the various Barracuda 18XL models.
Table 1: Drive model number vs. differentiating features
Number
Model number of heads
ST318436LW 6
ST318436LC 6
ST318436LWV 6
ST318436LCV 6
ST318426LW 6
ST318426LC 6
ST318416N 6
ST318416W 6
ST39236LW 3
ST39236LC 3
ST39236LWV 3
ST39236LCV 3
ST39226LW 3
ST39226LC 3
ST39216N 3
ST39216W 3
[1] See Section 9.6 for details and definitions.
The drive records and recovers data on 3.0-inch (74 mm) non-removeable discs.
The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI SPI-3 inter-
face specifications to the extent described in this manual (volume 1), which defines the product performance
characteristics of the Barracuda 18XL 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).
Number of I/O
I/O circuit type [1] connector pins
multimode (SE/LVD) 68
multimode (SE/LVD) 80
multimode (SE/LVD) 68
multimode (SE/LVD) 80
multimode (SE/LVD) 68
multimode (SE/LVD) 80
single-ended 50
single-ended 68
multimode (SE/LVD) 68
multimode (SE/LVD) 80
multimode (SE/LVD) 68
multimode (SE/LVD) 80
multimode (SE/LVD) 68
multimode (SE/LVD) 80
single-ended 50
single-ended 68
Number of I/O Data buffer
data bus bits size
16 2 MB
16 2 MB
16 4 MB
16 4 MB
16 1 MB
16 1 MB
8 2 MB
16 2 MB
16 2 MB
16 2 MB
16 4 MB
16 4 MB
16 1 MB
16 1 MB
8 2 MB
16 2 MB
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