dvd rw prob

hi all problem is dvd rw isnt working properly its a pioneer 109 it wont refresh the disk it just keep saying the same disk name with same popety as in i put a 4 gig dvd it say ive got cd in at 680 mb with a diffrent name do you see what i mean basicly it wont refresh the disk if i reboot it says there there no disk but the first ione i put back in it sticks on its not causing any problem but just inying still writes and reads fine just updated firmware but no change any idea please

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