I am starting to feel really old now.  The notch was to allow the floppy to 
flipped over to use the other side.  The initial drives were single sided and 
the notch was sensed by a micro-switch.  The presence of the notch meant the 
disk was writeable, where an absence of a notch (covered up notch) made the 
disk write protected.

Yes, some of us penny pinchers use to purchase SSSD (single-sided 
single-density) disks and notched them and hoped the quality was good enough to 
use as (single-sided double-density).  I wonder if anyone has written this up 
in a wiki?


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