For example, when you convert a basic GPT disk to a dynamic GPTĭisk, the Windows operating system takes 1 MB of the MSR partition space and uses it Partition contains additional space that might be needed by the operating system to MSR PartitionsĪn Itanium-based computer must have an MSR partition on every GPT disk. Here, you must prepare the second disk of the mirror so that it can be booted, and youĭo this by creating the necessary ESP and MSR partition. You must create an ESP is when you want to establish and boot to mirrored GPT disks. Never create an ESP unless you are directed to do so, however. Vendor-directed or Microsoft-directed guidelines for preparing the partition for use. After you create the partition, follow the Of the disk, up to a maximum size of 1000 MB. Select the disk you want to work with, and then type the followingĬommand: create partition efi size=N, where N is at least 100 MB or 1 percent You can create the necessaryĮSP by using DiskPart. New disk as a boot device rather than the existing boot device. Server 2008, there are some limited instances when you might be directed to create anĮSP after installing an additional GPT disk on a server, such as when you want to use the Although the ESP is normally created for you automatically when you install Windows Any changes you make could prevent the system from starting. Or other official documentation by an OEM vendor. Unless you've been specifically directed to by a Microsoft Knowledge Base article If you access the ESP, don't make changes, additions, or deletions The only way to access these directories is to use the EFI firmware's Boot Manager or Other directories areĬreated as necessary by the operating system. System as well as utilities such as Diskpart.efi and Nvrboot.efi. The ESP has several directories that contain the operating systemīoot loader, such as Ia64ldr.efi, and other files that are necessary to start the operating You cannot store data on it, assign a drive letter to it, or delete it by using Disk Management The ESP is shown in Disk Management but isn't assigned a drive letter or mount point.Īll Disk Management commands associated with the ESP are disabled, however, and The partition is sized so that it is at leastġ00 MB in size or 1 percent of the disk up to a maximum size of 1000 MB. Windows Server 2008 creates theĮSP during setup and formats it by using FAT. Is similar to the system volume on an x86-based computer in that it contains theįiles that are required to start the operating system. ESPĪn Itanium-based computer must have one GPT disk that contains an ESP. Logical Disk Manager (LDM) Metadata partitionĮach of these partition types is used and managed in different ways.GPT disks can have the following types of partitions: Managing GPT Disk Partitions on Basic Disks

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