With a speed of 12,030 rpm, Hitachi’s DK3E1T-91 was the world’s fastest 3.5-inch hard disk drive when it was announced. It was designed for applications requiring high disk performance, such as UNIX / PC servers and disk array units.
The record-setting disk speed was achieved by using 2.5-inch disks in a 3.5-inch hard drive unit, and an access accelerator was used to reduce the average seek time to just 5 milliseconds. Furthermore, advanced signal processing technology raised the maximum data transfer speed to 27.3 MB per second.
Despite the drive’s higher performance, its read/write power consumption was just 11.8 watts — in the same vicinity as previous drives. This meant previous system enclosures and power supplies could be used without modification.
|Storage capacity per unit||9.2 GB|
|Recording density||173,300 bytes per inch|
|Track density||11,000 tracks per inch|
|Area recording density||1.9 Gbits per square inch|
|Number of disks||9|
|Number of heads||18|
|Average seek time||Read: 5 ms, write: 6 ms|
|Disk speed||12,030 rpm|
|Data transfer speed||27.3 MB/s max.|