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I changed from one disk to another but when I look at what is on the new disk I see the contents of the old disk
Explanation: After removing a floppy disk from the drive and replacing it with another, the system still shows the contents of the old disk when the directory is searched.
Diagnosis: Modern floppy disk drives use a special signal as part of the floppy disk cable to signal when the disk that is in the drive has been changed. There is a sensor inside the drive that detects when the disk is ejected and a new one inserted, and a signal is sent to the floppy disk controller to tell it that there is a new disk in the drive. This mechanism is used for performance reasons: by keeping track of when the disk is swapped, the system doesn't have to re-load the contents of the disk each time you access it. However, if anything happens to cause this disk-change signal to not be sent properly when the disk is changed, odd problems and data corruption will result on your floppies, because the system will write incorrect information to what it thinks is a different disk than the one in the drive.