The Fujitsu M2351 "Eagle"
was a hard disk drive
with an SMD
interface that was used on many servers in the mid-1980s. It offered an unformatted capacity of 470 MB
in (6U) of 19-inch rack
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
The model 2351A incorporated eleven platters rotating at 3,960 rpm
, 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
. 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.