NeXT's cartridges are identical to the Canon because it's the same thing but with one less writeable surface. The drives are also identical so nothing prevents you on a NeXT from writing to one side, flipping the cartridge over and then using the other side.

Most of the 5.25" MO drives worked liked this. 3.5" and MiniDisc does not.

I've not been able t locate a picture of them together nor have I seen a picture of the Canon media outside of the case so this may be of interest to someone.

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You need to poke around my Photobucket more.