Diasonic Tech DDR-3128R - Manual (Page 21)

It's easy to manage MP3 and DVF files using the DDR-3000 Series
Software. Make a new folder in the location you want(this can be done
by right mouse clicking on the New Folder icon), copy and save
frequently used MP3 and/or DVF files. And, useless MP3 and DVF files
can be easily deleted by using delete button.
Select file, then click 'copy' from tool menu.
Locate New folder/folder you want to copy files to, then use 'paste'
from tool menu.
Files are copied and saved at designated folder.
Just like formatting a hard disk on a computer, the flash memory used in
the DDR-3000 Series can be reset (formatted). All the data in the flash
memory will be lost when formatting.
Select "File" from the main tool bar, then select 'Format Flash
Memory' to format the flash memory.
From flash memory managing window click on the right button of the
mouse for pop-up menu. Flash memory can be deleted from this
menu.
When format window appears press 'start' to start formatting.