Seagate 3TB Only showing as 746gb

[SLiiDE]

Looks like i need some more help...

In windows disk manager it says the drive is 3tb (After formatting):

But when i go into Acronis Trueimage to clone it, the drive is listed as 3tb but only has 2tb available:


I don't know how else i can get around this, seeing as i've never used such large disks before i've never had this problem and don't know what else to try

EDIT: After an hour or two i've managed to clone my existing drive onto the new drive with only a 2tb capacity. Then used Acronis to turn the remaining 746gb into another virtual drive. Not my ideal resolution but definatly happy
Thanks for all the help