Panasonic HM-TA1V Operating Instructions Manual page 17

≥ 4 GB or more Memory Cards that do not have the SDHC logo or 48 GB
or more Memory Cards that do not have the SDXC logo are not based
on SD Memory Card Specifications.
≥ When the write-protect switch A on SD card is locked,
no recording, deletion or editing will be possible on the
card.
≥ Keep the Memory Card out of reach of children to
prevent swallowing.
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