Sangean DDR-63+ (V1) - Manual (Page 78)

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With the radio in USB or SD mode, and with the media inserted press and hold the Menu
button.
Press the Folder Up or Down buttons until 'Delete all' is highlighted on the display.
Press the Select button. The display will ask you if you wish to 'Delete all files?'
If you do not wish to delete all the files, use the Folder Up or Down button to highlight 'NO'
and press the Select button to confirm.
Alternatively, to delete all the files on the media use the Folder Up or Down button to highlight
'YES' and press the Select button to confirm deletion.
All the files will be deleted. If there are no more files left on the media, then the display will show
'No Music File'. The operation will generally only take a few seconds. When completed, the
display will show 'No Music File'.
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Note: Once the files have been deleted, it is not possible to recover the previous contents.
Deleting files cont.
Deleting all files