Sony PCM-D10 Help Manual page 56

Before you start recording with an SD card, we recommend that you copy all the data stored on the SD card to a computer and format the
SD card on your linear PCM recorder so it contains no data. For instructions on formatting the SD card, see
(Format Built-In Memory/Format SD
Hint
To remove the SD card, make sure that [Please Wait] is not displayed on the display window, and then push the SD card into the recorder.
When it pops out, remove it from the SD card slot.
Related Topic
Structure of folders and files
Compatible SD cards
Changing the memory storage and the storage folder for recorded files
Card).
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Formatting the memory