Western Digital landed a symbolic milestone today by becoming the first to ship a hinted at 3TB internal hard drive. The Caviar Green 3TB packs 750GB per disk platter and is tailored to 64-bit platforms like Mac OS X Snow Leopard and Windows 7 64-bit that can see and boot from drives larger than 2.19TB. The drive builder goes so far as to bundle a special Advanced Host Controller Interface adapter so that 32-bit Vista and Windows 7 installs can still get to the full contents.