Panasonic Lumix S5 Manual page 26

1. Introduction
You can prevent the writing and deleting of data by setting
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the write-protect switch A on the card to "LOCK".
The data stored on a card may be damaged due to
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electromagnetic waves, static electricity or a failure of the
camera or card. We recommend backing up important data.
Keep the memory card out of reach of children to prevent
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swallowing.
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