To make more bits available for addressing, the storage device must be initialized by using GPT. This partitioning scheme lets up to 64 bits of information be used within logical sectors. It translates to a theoretical limitation of 9.4 ZB (9.4 zettabytes, or 9.4 billion terabytes). However, the issue that affects GPT is that most currently available systems are based on the aging BIOS platform. BIOS supports only MBR-initialized disks to start the computer. To restart from a device that is initialized by using GPT, your system must be UEFI-capable. By default, many current systems can support UEFI. Microsoft expects that most future systems will have this support. Customers should consult with their system vendor to determine the ability of their systems to support UEFI and disks that have storage capacities that are greater than 2 TB.