Hi,
I think that only worked on the Commodore 64 and likes, where the drive did not use the index hole to identify the start of sectors/tracks. Punching a hole there was much harder operation, than cutting a new write protect notch.
Szanolcs
On Fri, 1 Jul 2016, Marc Rochkind wrote:
> Those original floppies were I believe 160K. If you paid extra, the box
> would hold two drives. Later, IBM introduced double-sided drives, at
> 320K each.
Those in the know, of course, simply put a notch on the opposite side.
--
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will suffer."