Fujitsu Eagle

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 [Net capacity available would range between 330-380 MB, depending on formatting] in 10-1/2 inches (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 10.5 inch diameter platters, unlike most of its competitors which still used the 14 inch 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 5¼-inch PC disk would only deliver 0.4 MB/s).

Power consumption (of the drive alone) was about 600 watts.


External links

* Specifications
* of an Eagle
* Disk enclosure

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