Punching a hold also made the 5.25 disk read/write instead of read only. Games and other software would often come with a "master disk" with no hole punched, a

Punching a hold also made the 5.25 disk read/write instead of read only. Games and other software would often come with a "master disk" with no hole punched, and direct you to make a duplicate (or set of duplicates) that you would play off and save to.