Consult your system vendor to determine whether the system supports both UEFI and the startup of devices that have storage capacities of greater than 2 TB. The following tables list Microsoft support for the various concepts that are discussed in this article.
This information provides an overall support statement about disks that have a storage capacity of greater than 2 TB. Table 1: Windows support for partitioning schemes as data volumes. Table 2: Windows support for system firmware. Table 3: Windows support for combinations of boot firmware and partitioning schemes for the boot volume. Table 4: Windows support for large-capacity disks as non-booting data volumes.
However, the remaining capacity cannot be addressed and, therefore, cannot be used. The following steps show how to initialize a fresh disk by using the GPT partioning scheme to help ensure that Windows can address the maximum available storage capacity. Make sure that you back up any important data before you try these steps. Click Start , type diskmgmt. If it is necessary, enter the credentials for a user account that has Administrator privileges.
Note When a non-initialized disk is detected by Windows, the following window opens to prompt you to initialize the disk. Note If you select this option, this hard disk will not be recognized by Windows versions earlier than and including Windows XP.
Check the Disk Management window to verify that the disk is initialized. If it is, the status row for that disk at the bottom of the window should indicate that the disk is Online. After the disk is initialized, you must create a partition, and then format that partition by using a file system.
This is to be able to store data in that partition, and assign a name and a drive letter to that partition. To do this, right-click the unallocated space on the right side of the status row for that disk, and then click New Simple Volume. Follow the steps in the partition wizard to complete this process. If you have previously initialized the disk by using the MBR partitioning scheme, follow these steps to initialize the disk by using the GPT scheme.
In the Disk Management window, examine the disk status rows at the bottom. In the following example, the user has a 3 TB disk that was previously initialized by using the MBR partitioning scheme. Note that Disk 1 contains two separate unallocated sections. This separation indicates that the first 2 TB of the disk space can be used. However, the remaining space is non-adressable because of the bit addressing space limitation of the MBR partitioning scheme.
To enable the system to fully address the total capacity of the storage device, you must convert the disk to use the GPT partitioning scheme. Right-click the label on the left for the disk that you want to convert, and then click Convert to GPT Disk.
Note The display should now show that the full amount of available space in unallocated. Now that the disk is initialized to access the full storage capacity, you must create a partition, and then format that partition by using a file system. Because the transition to a single-disk capacity of greater than 2 TB has occurred fairly recently, Microsoft has investigated how Windows supports these large disks.
The results reveal several issues that apply to all versions of Windows earlier than and including Windows 7 with Service Pack 1 and Windows Server R2 with Service Pack 1. Contact us. Ask the community.
Support for business. IT Pros and admins. Report a privacy concern. Report a support scam. Unlock now. Try one month free. Stay a step ahead with Microsoft Windows 11 is here! Learning and training. This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, see Windows registry information for advanced users.
When you configure a server with more than eight LUNs, the hardware vendor must be involved in the planning and configuration. There may be several different ways to achieve the configuration you want; the hardware vendor is best equipped to supply the necessary information. This article isn't meant to be all-inclusive because of the various implementations that a hardware vendor can use.
Contact your hardware manufacturer to determine if and how your hardware can support more than eight LUNs. Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk. Windows Server supports Large LUNs, but the method for enabling it depends on the hardware implementation and drivers.
If the storage device reports the HiSupport bit in its standard inquiry data, Windows automatically enables Large LUNs without requiring any manual registry entries. Contact the hardware vendor to determine if the storage device reports the HiSupport bit.
The hardware drivers may also enable large LUN support during their installation routines. If the hardware doesn't report the HiSupport bit, or the drivers don't enable Large LUN support, a manual registry entry is required.
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