Solution
The SD memory card, SDHC memory card, SDXC memory card or Eye-Fi cards have a write-protect switch.
If the Write Protect switch is in the locked position, the following screen appears.
If [Card's write protect switch is set to lock] appears on the LCD Monitor of the camera,
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the Write Protect switch of the memory card being used is in the
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locked (downside) position, so you cannot capture or delete images.
To unlock the tab, slide
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the Write Protect switch of the memory card upward.