I have to admit I'm rather confused by your question. The [http://www.forevermac.com/category/mac_desktop_computers/apple_mac_intel_imac/|Intel iMac] has a Terrabyte sized Hard Drive, which I assume you mean (not gigabtye "GB"). The 21.5 inch iMac will come with a 1 TB drive as standard. However, the larger 27 inch iMac will be available with a 1TB, 3TB, 768GB SSD or 3TB fusion drive with 128 gigs of flash ram on board. They'll be single drives, but no-one as yet has any information on the physical dimensions of the drives.