H-6587 Magnetic Disk Unit

The H-6587 disk unit was developed as the successor of the H-6586 disk, and inherited its basic system. It had a capacity of 2.92GB, which was the highest in the world at the time. The disk rotation speed was increased from its long-time value of 3,600rpm to 4,260rpm, and the transfer speed increased accordingly to 4.2Mbyte/s, opening the way to high-speed processing.