CF memory shrinking

I have several Extreme III cards, 16GB and 4GB.  I notice lately that my cards are full in my Nikon D3 but really they are only holding a fraction what they used to hold.  Example my 16GB card only fills to about 4GB.  I always reformat in the camera before use, is there a way to recondition and reclaim the memory space?

Try formatting your card using ‘HP USB Disk Storage Format Tool’.

it will recover the missing space in ur memory cards.