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An expanded outlook of design factors for a dual-density diskette
controller involves system integration of the diskette drive and covers
bit packing densities, data recovery methods, input and output
interfaces, and available methods of accessing data
John Worden Magnetic Peripherals, Incorporated, Oklahoma City. Oklahoma
I mplementation of flexible diskette drives as low cost
data processing peripheral memory devices is increasing
attention to the hardware/software interfaces of both
the diskette drive and the host computer. Specifically,
rapidly in terminals and standalone systems, where the controller' interface must consider diskette format,
storage capacity, performance, and capability to random- read/write-erase head design, data encoding and re-
access data make them suitable for on- and offline covery means, and diskette drive requirements. The
information and software applications. Previously limited host computer interface must be concerned with soft-
by the ability to operate using single-density, single- ware command-level interface, logical interface be-
sided media, the storage capacity of flexible diskette tween the two devices, and the timing relationships
drives quadrupled during the past year when units necessary for contiguous-sector data transfers-the
capable of both double-density and 2-sided media optimum condition for diskette data transfer.
read/write operation were introduced. However, since
existing single-sided, single-density-encoded diskette
drive controllers were incapable of operating 2-sided, Soft