On 10/31/21 9:57 AM, geneb via cctalk wrote: > > I'm working with the developer of the Applesauce disk imaging tool in > order to iron out some issues with 8" disk support. > > I'm using a Qumetrak 842 disk drive that's got support for both double > and single-sided media. This means that it's equipped with two index > hole sensors, slightly offset from one another. It's my understanding > that single-sided media has the index hole in one spot on the jacket, > and double-sided media has one in a slightly different location. > > The issue at hand is some NIB Dysan double-sided 8" media I have - the > disks have index holes in the jacket in both locations. Is this > typical, or do I have some weird "special" disks on my hands? The > Applesauce author posits that the combination of the dual-sensor drive > and the dual-hole media wouldn't typically find themselves together. Is > this accurate? If it's not, how would a system contemporary with the > media have handled the two index holes?
Gene, are you certain that these aren't "flippy disks" (two index apertures)? But I've seen what you describe. I recall one occasion where I received the single-double type that you describe and having to cover the single-sided hole to get to the other side of the disk. --Chuck
