Browse Prior Art Database

Self Identification of Dual Sided Diskette Drives

IP.com Disclosure Number: IPCOM000048496D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bishop, DA: AUTHOR [+4]

Abstract

In current diskette sub-systems, it is not possible for system software to directly verify that a dual-sided diskette is available. It is not feasible to consider the use of a dual-sided diskette in customer set-up software since it is incompatible with a single-sided drive mechanism.

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Self Identification of Dual Sided Diskette Drives

In current diskette sub-systems, it is not possible for system software to directly verify that a dual-sided diskette is available. It is not feasible to consider the use of a dual-sided diskette in customer set-up software since it is incompatible with a single-sided drive mechanism.

This problem has been solved by a method for determining if a single-sided or dual-sided diskette drive mechanism is present without the use of a dual-sided diskette or program switches. The method is based on the fact that a single- diskette is compatible with a dual-drive mechanism. The method involves a series of actions that can be performed by system software to verify that a customer's installation does include a dual-sided drive mechanism.

The first step is to perform a series of "READ ID" commands directed to several cylinders of side Phi. The purpose of this step is to generate a reference since both single and dual sided drive mechanisms will return the same results when a single-sided diskette is read. The next step is to perform the same series of "READ ID" commands as before, but directed instead to side 1. If a single- sided drive mechanism is present, it will ignore the interface line which selects side 1 and will return the same results as in the previous step. On the other hand, if a dual sided drive mechanism is present, it will attempt to actually read information on side 1. Since side 1 of the single-sided diskett...