Lost Memory Sandisk 6Gb. to 67 Mb.

Question

I formatted a 6Gb Micro SD card in my LG Viewty Phone, now it's only giving me a volume of 867 mb. I checked the card in my PC through XP Disk Management and it shows that a partition has been created. It says online is 5.68 Gb. with 867 Mb. healty and 4.68 Gb. unallocated. How do I get the whole 6 Gb. to work again, do I have to delete the partition and how?