FDS Disk Bares All!

[Skawo]

Oh, so the spindle just pops open, turns out, and you can reassemble it afterwards.

[Stephen]

Oh, so the spindle just pops open, turns out, and you can reassemble it afterwards.

Ah yes, I discovered this just a few weeks ago. I bought a lot and found one of the disks did this in shipping. I think I already made a 3D model but there's a chance to reproduce these with resin printers.

[ericj]

The grommet also pops apart like that for many of the common bootleg FDS disks.

[FDS-Hungry]

Has anybody tried writing a rom to a Roland disk to make a 2022 bootleg?

[Skawo]

Does anyone know why this groove was added to later disks?
All my blue disks have it, but some of the yellows don't, even though I'm fairly sure these are all official disks;



Seems like they started getting added in July 1986. I have a disk with the disk code G016F13 (=July 1, 1986) that doesn't have the notch, and a disk G246F03 (=July 24, 1986) that does. Disks after July 1986 all have it.

[Stephen]

I noticed this as well -- is it the early disks which don't have the cutout? I suspect it's either part of the design to ease feeding the disks from a tray (ensuring alignment) during manufacturing or for a later automatic disk writing assembly.

[Skawo]

Yep, based on the disk codes it's always consistently not on early disks.