3 tb hard drive only shows 2 tb. Whats the problem? Tags: Hard Drives Computer Storage Last response: November 24, 2012 5:39 AM in Storage Share cyclotroncs30 November 24, 2012 3:15:12 AM Hello, I just bought a 3tb hdd but my computer only see it as a 2tb hdd. About .7tb hdd reads as unallocated space. I want to use this hdd as data, not OS. Please help. More about : hard drive shows whats problem Emerald a c 115 G Storage November 24, 2012 5:39:14 AM you need to format the HDD with GPT http://www.petri.co.il/gpt-vs-mbr-based-disks.htm m 0 l Can't find your answer ? Ask ! Publish Read discussions in other Storage categories Hard Drives DVD Drives DVD Writers Optical Media Flash Media NAS/RAID SSD Western Digital !