The Fujitsu M2351 "Eagle" was a
hard disk drive
A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnet ...
with an
SMD interface that was used on many servers in the mid-1980s. It offered an unformatted capacity of 470
MB[Net capacity available would range between 330-380 MB, depending on formatting] in (6U) of
19-inch rack
A 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. Each module has a front panel that is wide. The 19 inch dimension includes the edges or "ears" that protrude from each side of the equ ...
space, at a retail price of about US$10,000.
The data density, access speed, reliability, use of a standard interface, and price point combined to make it a very popular product used by many system manufacturers, such as
Sun Microsystems
Sun Microsystems, Inc. (Sun for short) was an American technology company that sold computers, computer components, software, and information technology services and created the Java programming language, the Solaris operating system, ZFS, the ...
. The Eagle was also popular at installations of
DEC VAX systems, as third-party storage systems were often dramatically more cost-effective and space-dense than those vendor-supplied.
The model 2351A incorporated eleven platters rotating at 3,960
rpm
Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or with the notation min−1) is a unit of rotational speed or rotational frequency for rotating machines.
Standards
ISO 80000-3:2019 defines a unit of rotation as the dimensionl ...
, taking half a minute to spin up. The Eagle used platters, unlike most of its competitors, which still used the standard set in 1962 by the
IBM 1311
IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. Both the hard disk drive (HDD) and floppy disk drive (FDD) were invented by IBM and as such IBM's employees were responsible fo ...
. One moving head accessed each data surface (20 total), one more head was dedicated to the servo mechanism. The model 2351AF added 60 fixed heads (20 surfaces × 3 cylinders) for access to a separate area of 1.7 MB.
The Eagle achieved a data transfer rate of 1.8 MB/s (a contemporary PC disk would only deliver 0.4 MB/s).
Power consumption (of the drive alone) was about 600 watts.
Notes
External links
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{{Fujitsu
Computer storage devices
Fujitsu