Service manual

Introducing the SA7x Enclosure

This chapter is an overview of the SA7x enclosure, lists SA7x conﬁgurations and

speciﬁcations, and discusses user precautions.

1.1 SA7x Enclosure Overview

The term ‘‘SA7x’’ refers to the family of enclosures that includes:

• The SA70—Accommodates one to four RA70 disk drives (280 MB each)

• The SA71—Accommodates one to four RA71 disk drives (700 MB each)

• The SA72—Accommodates one to four RA72 disk drives (1 GB each)

• The SA73—Accommodates one to four RA73 disk drives (2 GB each)

For all of these designations, the enclosure itself is physically identical. What

differentiates an SA70 enclosure from an SA71 enclosure is the type of drives

installed in each (RA70s and RA71s). See Figure 1–1 for an illustration of an

SA7x enclosure.

Table 1–1 lists the the types of disk drives that are authorized for installation in

each SA7x enclosure.

Table 1–1 Authorized Disk Drive Installations

Enclosure RA70 RA71 RA72 RA73

SA70 Yes No No No

SA71 Yes Yes Yes Yes

SA72 Yes Yes Yes Yes

SA73 Yes Yes Yes Yes

A maximum of three drives may be installed.

The SA7x enclosure provides mounting space, power, cooling, and control for up

to four RA7x disk drives. Each disk drive is independently powered and operated

by the enclosure.

The enclosure is installed as a component in a storage array cabinet.

The RA7x disk drive used in the SA7x enclosure is a random-access Winchester

technology drive with a formatted storage capacity of 280 MB to 2 GB. The drive

features modular components that can be replaced with minimum down time.

Figure 1–2 shows an RA70 disk drive. Figure 1–3 shows an RA71 through RA73

disk drive.

Introducing the SA7x Enclosure 1–1