Question about Canon PowerShot A540 Digital Camera
SD cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card. If the switch is already in the proper position, slide it fully the other way and then back again.
The switch can be moved accidentally by nudging it against the edge of the slot. It could also be that there's an obstruction or some debris in the slot that could have nudged it.
Posted on Sep 13, 2010
Testimonial: "I had no idea there was a switch on the card. Thanks."
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Posted on Jan 02, 2017
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