There were several such discs there, each in its own jewel case, though they varied in colour (most were black, this one is yellow). The tray card in the jewel case is, in each case, a printed photograph (a similar technique was used on Indonesian copies of cassette albums in the 1980s). The diskettes are neither 3.5" disks of the sort used on PCs, Macs and Amigas, nor the disks used on Amstrad 8-bit computers, but some other format; perhaps the same as the disks used on some old samplers and dedicated word processors?
Does anybody know what kind of system this disk was created for? I'm guessing it's either an 8-bit computer or some type of floppy-based game console that didn't make it out of Asia. Then again, given the photographic tray cards, perhaps it was designed for some illicit cartridge-copying device that piggybacked onto a better-known system. I vaguely recall seeing these disks at a flea market a decade or two earlier as well.
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