System for adapting a computer system to different types of data

Details System for adapting a computer system to different types of data System for adapting a computer system to different types of data

1996-09-25

1998-06-02

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711112, G06F 1200

Patent

active

057616990

ABSTRACT:
A computer system has a host system and a disk drive external thereto. In order to adapt the disk drive to interchangeable use with two or more different types of disks such as double density disks and high density disks of both 1.25 and 1.44 megabyte capacities, the host system first determines which of the interchangeable types of disks is loaded in the disk drive. If a different operating mode such as a different disk speed proves necessary in the disk drive, the host produces a selected one of standard disk drive control signals in combination with a mode change command for multiplex transmission to the disk drive. No dedicated channel is therefore needed for sending the mode change command from the host to the disk drive. Stepping pulses are utilized in one embodiment for carrying the mode change command, in the form of consecutive stepping pulses, the number of which is greater than that required for moving the head across all the tracks on any of the interchangeable disks. Another embodiment employs a read gate signal which switches to a prescribed state with a predetermined time delay to denote the mode change command.

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