|In reply to Comment 80 (Solar):|
>If I remember correctly, the clicking comes from the floppy controller moving >the head from track 0 to 1 and back. If the drive returns an error, there is >no disk (and a "click"). The "no click" hack simply changes this behaviour >to "track 0 to track 0". Be warned, this is urban legend, and might be >completely wrong.
Almost correct. THe reason for the click is that the floppydrive will not update the DSKCHG line until it has stepped the drivehead. So AmigaOS will just step the head back and forth every 2.5 seconds to check if a disk has been inserted. (No errors involved). The NoClick patch changes this behaviour to always step from track 0 to track -1. Most floppydrives will ignore this command, but will still update the DSKCHG line. Some other drives will cause an even loder click as the drivehead will indeed step to -1, which will cause a mechanical failsafe to trigger.
It is possible for standard "PC" floppycontrollers to detect diskchanges, as it has been done in both AROS and Win2k.