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Sony introduced their own format of a 90 mm x 94 mm disk in 1982 in their SMC70.
The SMC 70 was thus the first computer, with the final standard drive, a
three and a half inch floppy disk. This disc stood out by their comparatively simplicity, however, could not prevail '82 against the widespread
five quarter system.
However, in the end of 1982 the five quarter standard was replaced by the three and a half standard, by order of the "micro floppy Industry
Committee", the conquest of the Sony architecture began.
Primarily through Apple's election in 1984, Ataris and Commodores in 1985, the three and a half floppy prevailed over the five one quarter.
The new models got a snap latch which should protect the memory layer from external influences, such as dust.
The rectangular shape of the disks prevented that they have been mistakenly inserted
incorrectly. The closure was also partially obstructive. It scratched on the plastic housing, for example, when it was deformed or became entangled in the drive,
which was usually equated with a total breakdown of the drive.
