EXPLORER ?
If yes, I'm thinking you need to partition (allocate) the space on the new disk and then do the QUICK format so it can be used.
VAPCMD
Well today for christmas i got a new 1TB HardDrive
I was so exited so i connected it to my pc and turned my pc on ^_^ When i went to My Computer to see the new hard drive i saw it wasnt there? And i became worried so i looked up videos online... These videos told me that sometimes they dont show up due to the fact of the Drive not being assigned a letter... so i went to disk management and i assigned it to letter G:. After i finished that i went back to My Computer and the HardDrive still didnt appear
I then went back to disk management to check the drive again and this time the drive was no where to be found?!?! Can someone help me?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic