I remember the Amiga let me customize the format with some tools. One could format more tracks than the specification to fill 900+ kB on a DD floppy beyond the initial 880 kB Amiga standard format. Gave important bragging rights when put against 720 kB PC plebs. Some games used it for copy protection i.e. copy protection on track 80+ https://eab.abime.net/showthread.php?t=101343 Of course, X-Copy and others knew and copied extra tracks.
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