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Microsoft Windows Logo Program System and Device Requirements  —  48

The ESP may only be used for components required for system boot, installation, or recovery. Examples of such components include operating system loaders, EFI drivers, firmware utilities, configuration tools, and diagnostics.

A5.4.7.3 System provides restoration tool for recovery of critical ESP and OEM special partition contents

An EFI system must provide a tool that will permit the user to restore the critical EFI System Partition contents and any OEM special partition contents in the event of a catastrophic failure. This tool does not need to restore any operating system or other non-OEM–supplied ESP contents.

A5.4.7.4 MSR partition of correct size is present on every physical or virtual hard disk manifested to Windows when such disks are otherwise being partitioned by the provider of the system

All entities that represent themselves as a hard disk to an EFI system—whether single drives, or collections of drives behind an intelligent controller that represents the assembly as a whole as a single “disk”—must contain an Microsoft Reserved (MSR) partition of correct size.

This guideline applies only to disks shipped with systems being partitioned by the provider of the system, such as disks that contain system utilities or are otherwise preinstalled with software for use by or with Windows. It is not required for disks that are “blank”—in other words, those disks that have no partitions present on them when installed by the manufacturer and that will be configured by the user.

The formula for calculation of the size of an MSR is as follows:

if (disksize < 16 GB) {MSR = 32 MB;} else {MSR = 128 MB;}

The GUID for such partitions is defined as follows:

DEFINE_GUID(PARTITION_MSFT_RESERVED_GUID, 0xE3C9E316L, 0x0B5C, 0x4DB8, 0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE);

A5.4.7.5 Non-ESP partitions do not contain software required for boot

No software required for system boot can be stored in an OEM-specific, non-ESP partition. Instead, such software must reside in an ESP or in system firmware.

A5.4.7.6 ESP resides only on a device that can be reached through firmware-resident EFI drivers

To prevent problems that can occur if a driver needs to reach a disk containing an ESP that is actually contained on that disk (resulting in a non-bootable system), ESPs must be placed only on devices that can be reached using firmware-resident EFI drivers.

A5.4.8 - A5.4.10 DELETED
A5.4.11 System includes 1 GB memory, minimum

See WL-2


A5.5 Itanium-based System - FAQs

See http://www.microsoft.com/winlogo/hardware/.

A5.R Itanium-based System - Future Requirements

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