In other threads about buffers and card speed, the question came into my head about whether the card would be able to transfer files quicker if it were formatted after each shoot. I format the card immediately after downloading the RAW files to my accessory hard drive connected to my MacBook. I do not have problems with any issues with the buffer although on some long exposures i can see the green light on the back of the D4 stay lighted for a period of a second or two after the exposure is completed.
Thus, my question is whether just deleting the images is less efficient than reformatting the card after each shoot. I do have an opinion but would like to hear what others have to say.