Kyocera WP31C - Manual (Page 109)

3.9 Operating the Storage Device
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Press the U or V key repeatedly until >Delete Data appears. The data name
also appears (Report, in this example).
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Press the ENTER key. A blinking question mark (?) appears before the data name.
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Press the U or V key to display the desired data name.
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Press the ENTER key. Processing appears and the data is deleted from the
memory card. The display returns to Ready.
Formatting a Memory Card
A new memory card must be formatted before it can be used in the printer. Formatting
allows data to be written to the memory card.