RZ28D High-Performance StorageWorks Disk Drive

HIGHLIGHTS

o  7200 RPM 2.1-GB, 3.5-inch SCSI disk for the HSX controller family

o  Offered in both narrow and wide variants

o  StorageWorks enclosures available from deskside to datacenter

PRODUCT DESCRIPTION

The RZ28D 2.1-GB, 3.5-inch SCSI disk drive is the latest entry into the 
7200 RPM high-performance family. It takes its place with the 4.3 GB 
RZ29B. Available in both 8-bit narrow (RZ28D-VA) and 16-bit wide 
(RZ28D-VW) variants, the RZ28D is particularly well-suited for 
high-bandwidth applications where performance and data integrity are of 
paramount importance.

BENEFITS

o  A 40 percent faster transfer rate than 5400 RPM offerings

o  25 percent reduced rotational latency and track-to-track seek times

o  Significantly reduced command overhead time because of faster spindle 
   speed and more efficient firmaware

o  Easy to install, configure, maintain, and hot swap

o  Backed by a 5-year warranty; first year onsite

o  Protected investment and configuration flexibility with StorageWorks 
   enclosures

AVAILABILITY AND ORDERING

The RZ28D disk drives are available from Digital and its authorized 
distributors.

Order No.    Description

RZ28D-VA     2.1 GB 7200 RPM StorageWorks Building Block, 8-bit
RZ28D-VW     2.1 GB 7200 RPM StorageWorks Building Block, 16-bit

TECHNICAL DATA

The RZ28D-VA is not supported in the BA353 cabinet at present. For 
additional technical information, please see the "High Performance 
StorageWorks Disk Drives" article in the November 1995 issue of Customer 
Update.

The RZ28D 2 GB 7200 RPM can be combined with the RZ28M 2 GB 5400 RPM disk 
in stripe/shadow sets. The following table compares selected 
specifications for the two disk drive types:

Specification Highlights         RZ28D                RZ28M

Capacity (MBF)                   2,104                2,104

RPM                              7200                 5400

Media transfer rate (MB per      3.56 to 7.65         2.7 to 5.5
second)

Average rotational latency       4.17                 5.54
(milliseconds)

Average seek time - Read         8.0                  9.0
(milliseconds)

Average access time - Read       9.0                  10.4
(milliseconds)

Track-to-track seek time         1.6                  2.1
(milliseconds)

MTBF                             800,000              800,000

All 7200 RPM drives require additional cooling. Users should order the 
cabinet with the cooling already installed (part numbers SW800-FA/FB, 
SW500-FA/FD, SW300-AA), or, if installing 7200 RPM drives in an existing 
cabinet, order and fit the additional fan tray (part numbers SW8XF-AA/AB 
and SW5XF-AC/AD). No changes are required to the SW300 cabinet, which 
already has the additional cooling provided. Minimum operating system 
support

o  OpenVMS VAX V5.5-2
o  OpenVMS Alpha V6.1
o  OSF V3.2
o  Windows NT V3.5

The RZ28D models are for use on Digital hardware platforms only.