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v. Simple past tense and past participle of unmount.

adj. Not mounted (in various senses).

Not mounted; not performing regular duties on horseback: as, unmounted police.

Not furnished or set with appropriate or necessary appurtenances: as, an unmounted jewel; not affixed to a mount or backing, as of stiff paper or cardboard, as a drawing or a photograph; not provided with a mat of appropriate size and covered with a protecting glass, as a lantern-slide or transparency.

"On the Centro, the Micro SD card routinely becomes "unmounted," and you can't access the card."

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