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EFI architecture

Caution

- The EFI partition is not protected and can therefore be deleted.

- Backing up the computer using the Windows® Vista®

Complete PC Backup does not back up the EFI partition.

For these reasons, HP recommends that you do not place

additional data on the EFI partition. Because the partition is not

backed up, corruption or failure of the partition will result in loss

of all data on the partition, plus loss of EFI functionality.

The volume name is HP_TOOLS.

The EFI partition file and folder structure are similar to the Windows file and folder structure. EFI

application installation should follow the rules established by this white paper.

HP EFI application SoftPaqs unbundle into the C:\swsetup directory. The EFI software installation then

searches for the FAT32 partition labeled HP_TOOLS and installs itself into the following directory:

:\Hewlett-Packard\softwarename

For example, Quicklook.efi and its digital signature are placed in the following directory:

:\Hewlett-Packard\Quicklook\quicklook.efi

If the EFI application installation does not find a partition named HP_TOOLS, the installation fails and

an error message is displayed.

The launch algorithm of the EFI BIOS application enumerates all FAT32 partitions and launches only

the first instance of the application. The application search algorithm searches only the volume

labeled HP_TOOLS for the predetermined name and path of the application.

When an EFI application is launched, it has as much control of the system resources as the BIOS

does. Because EFI applications reside on the public hard drive partition which is easily accessible and

therefore insecure, BIOS launches only EFI applications signed by HP.

Caution

To reduce security vulnerability, execute only HP-signed EFI

applications.

All HP EFI applications contain two files stored on the EFI partition under the same subdirectory as the

EFI application: filename.efi and filename.sig.