When i format the memory card in my samsung g 600, the capacity reduces by a half. Why? Can i get the full capacity back again

may be your memory card is a high capacity type you must know the supportable stick, there is classification in memory sticks, SD/ SDHC/ SDXC like, high GB will not support your cam.

After copying the video to your computer, then format the memory card using the camera's menu functions.

insert the memory card into a software set(eg nokia 5800, 5233, 6120c etc)
Select setting>data mgr> memory>format the memory card.
Its working

Take no more pics until you've recovered your photos, take the card out of the camera. This is to reduce the chance of you overwriting some of your "lost" photos. There are many good freeware photo recovery software options that may help you recover your photos. This article reviews and outlines several of the better ones. Now after you've recovered your photos, consider formatting the card in the camera to prevent this from happening again.

Make sure the camera is capable of using a high capacity card. If it is then make sure you format the card. If thats not it then maybe the card is faulty. Have you any friends with cards that you could try..

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The Samsung Gravity doesn't support the Micro SD HC (High Capacity) cards, just the regular Micro SD cards. Yes, it sucks.

You did not mention the make or model of the camera. Your symptoms seem to indicate you are using internal memory rather than the card. Card typically hold from 200-2,000 high quality photos (depending on the size of the card and the camera).

Another possibility is that you have a high end camera and are shooting in the RAW format. RAW is only for the more experienced users who post process their work. If this is the case switch to JPG.

Note reducing the picture size only makes the pictures lower quality and is only useful if you only post them on the web.

delete some files or folders from ur mobile and try to transfer the data

What size is the memory card. What picture size has the camera been set to? Check out your Manual for the images sizes viz a vis memory card capacity - and come back