Dell 2408WFP User Manual page 41

Despite the Although the pop-up window disappears during writing, if
disappearance of the you eject your media while the LED is still blinking, then
pop-up window, the you cannot complete your action on the media.
media has been
ejected while the
LED was blinking.
Cannot format or Write protect switch is enabled.
write on the media.
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Format the media for writing or erasing the same folder or file name.
Verify that the write- protect switch of the media is unlocked.