New HD installed but?

I have just recently installed a new 500gig HD, cause 40gig was very fat. Went by steps to computer Man. 2. Disk Man. 3. disk 1 named (G) came up with 17.76GB unallocated and 448.00GB Free space but I cant seem to find a way to send anything to (G) drive?? any help would be GREATLY appreciated .Thanks DrewL:confused:

Did you create a partition and format the drive?

I believe I did . when I came up with the 17.76GB unallocated and 448GBfree???:confused: