RE:First, make sure you're using Windows XP or Windows 7. XP can only display 2T at most, and the default partition list MBR, Win7 can support large capacity hard disk, default partition list GPT; 3T hard disk only shows 746G is because the default MBR partition list, available fast partition software in Win7 environment, first delete all partitions, in the selection of GPT re-partition can be.