grout001.jpg
3.5 inch diskette cannot be inserted unless diskette is oriented correctly. This is as far as a disk can be inserted upside-down.
grout002.jpg
The beveled corner of the diskette pushes a stop in the disk drive out of the way allowing the diskette to be inserted. This feature, along with the fact that the diskette is not square, prohibit incorrect orientation.
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Categories:

Mistake-proofing category: mistake detection
Setting function: Physical
Regulatory function: Shutdown
Source: Off-the-shelf

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