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Windows and boot disks larger than 2TB #

Windows' Support for Disks with Capacity Greater than 2TB:
In order for a system to fully support capacities greater than 2TB, the device must be initialized using the GPT partitioning scheme to support addressing the full range of capacity. If the user is intending to boot from one of these large disks, there is an additional requirement that the system's base firmware interface must be using UEFI and not BIOS.
Windows and GPT FAQ:
Q. Can Windows 7, Windows Vista, and Windows Server 2008 read, write, and boot from GPT disks?
A. Yes, all versions can use GPT partitioned disks for data. Booting is only supported for 64-bit editions on UEFI-based systems.
So to create bootable partitions larger than 2TB for Windows-based OSes:
  1. UEFI instead of BIOS
  2. GUID Partition Table (GPT) instead of Master Boot Record (MBR)
  3. 64-bit version of Windows Vista, 7, or 2008
It may be possible to non-destructively convert or migrate a Windows boot disk from MBR to GPT: Rod Smith, the author of GPT fdisk, offers detailed GPT documentation, including:

/windows | Apr 22, 2012


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