How do we know that a CD or DVD is full or blank just by watching its back side?

ArulSeth

New member
I often see people just watch the back sector of a CD and tell that whether the CD is blank or full.
Any help would be very grateful!!
 

SrinathB

New member
there will be a round line in the back of the disk.if it is closer to the hole in the middle then it has more free space.if it is closer to edge of the disk,then it has less free space.
 
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