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Barracuda 18XL Product Manual, Rev. A 5

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

[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).

Model number

Number

of heads I/O circuit type [1]

Number of I/O

connector pins

Number of I/O

data bus bits

Data buffer

size

ST318436LW 6 multimode (SE/LVD) 68 16 2 MB

ST318436LC 6 multimode (SE/LVD) 80 16 2 MB

ST318436LWV 6 multimode (SE/LVD) 68 16 4 MB

ST318436LCV 6 multimode (SE/LVD) 80 16 4 MB

ST318426LW 6 multimode (SE/LVD) 68 16 1 MB

ST318426LC 6 multimode (SE/LVD) 80 16 1 MB

ST318416N 6 single-ended 50 8 2 MB

ST318416W 6 single-ended 68 16 2 MB

ST39236LW 3 multimode (SE/LVD) 68 16 2 MB

ST39236LC 3 multimode (SE/LVD) 80 16 2 MB

ST39236LWV 3 multimode (SE/LVD) 68 16 4 MB

ST39236LCV 3 multimode (SE/LVD) 80 16 4 MB

ST39226LW 3 multimode (SE/LVD) 68 16 1 MB

ST39226LC 3 multimode (SE/LVD) 80 16 1 MB

ST39216N 3 single-ended 50 8 2 MB

ST39216W 3 single-ended 68 16 2 MB

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 109 110

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