On Feb 25, 9:30 pm, "Bill Garber" <willy4...@garberstreet.com> wrote:
"D Finnigan" <dog_...@macgui.com> wrote in message
dog_cow-1267150605@macgui.com">news:dog_cow-1267150605@macgui.com...
Michael J. Mahon wrote:
Just out of curiosity, what is the technique for making a
second index hole in the jacket without damaging the media?
I noticed that many of the disks which I inherited had
been punched with a standard, hand-held paper hole punch.
You may be referring to the Write-Protect Notch.
The hole we are referring to is the small hole
near the hub which sets up the start of each track
on some drives. Apple disks don't actually use it,
but, if it isn't there on the flip side when trying
to read it with an IBM drive, it won't work.
They didn't use it at all? Now thinking back, I remember the TI-99
only uses it for the format routine, and thereafter there is an index
pulse/start of track on the disk placed by the format routine.