DSE1340S

In August 1995 NEC announced the DSE1340A and DSE2010A ATA 3.5-inch magnetic disk units and the DSE1340S and DSE2010S SCSI 3.5-inch magnetic disk units. All four models featured the industry’s highest storage capacity of 670 MB per disk. To increase the units’ storage capacity, NEC used PRML, a demodulation method that raises the head density and read efficiency. NEC achieved the highest available data transfer speeds — 16.6 MB per second — and read / write speeds — 10 MB per second — at the time by using PIO Mode 4, a high-speed external interface. And highly reliable disk array systems could be constructed because of a spindle synchronization function that ensured data reads and writes were in sync when using multiple disk units simultaneously.