Method for Verifying That a Correct Disk Is in a Disk Drive
Original Publication Date: 1988-Mar-01
Included in the Prior Art Database: 2005-Feb-14
Prior to any file I/O (input/output) operations, verification of a disk in a disk drive is made to be certain that it is the correct disk to which the I/O operation is to be performed. Whenever a software program of a personal computer (PC) wants to perform reading or writing of a disk, DOS is queried initially to determine if the disk has been changed since the last successful read/write. If the disk has been changed, the volume label (name of the disk) on the disk in the disk drive is checked against the volume label of the disk used when the file was first opened. If the volume labels are not the same, the PC screen has a message to inform a user to insert the proper disk before the I/O operation is performed. Each disk has a different unique volume label to insure that the correct disk is in the disk drive when desired.