That's how Cromemco shipped their distribution disks, with both holes and a sticker to cover the unused hole with arrows on it to show which way was which.
m On Thu, Sep 22, 2022 at 4:32 PM Fred Cisin via cctalk <cctalk@classiccmp.org> wrote: > On Wed, 21 Sep 2022, Eric Smith via cctalk wrote: > >>> They didn't deal with it at all. It didn't work. No normal 8-inch > >>> floppy disks have both index holes in the jacket. If you convert a > >>> disk from SS to DS, or vice versa, by punching the other index hole in > >>> the jacket, you have to cover the original, unless you're going to use > >>> it in a drive that has only one index sensor (typically an SS drive). > > On 9/22/22 12:04, geneb via cctalk wrote: > >> I've got at least three boxes of NOS Dysan disks with both of those > >> index holes present, so they certainly were made commercially. > > On Thu, 22 Sep 2022, Chuck Guzis via cctalk wrote: > > Yup. I've got similar NOS ones also. > > Since those are not "normal", or at least uncommon, please send one such > disk to Eric for his collection of odd stuff. > > It would have made sense for a drive with both sensors to have jumpers, > that could, if needed often, be wired to a switch. > > When I repunched 8" disks, I put a write-enable tab over the old hole. > > -- > Grumpy Ol' Fred ci...@xenosoft.com >
