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Extensible Firmware Interface Specification
Event
An EFI data structure that describes an "event" — for example, the expiration of a timer.
Event Services
The set of functions used to manage events. Includes CheckEvent(),
CreateEvent(), CloseEvent(), SignalEvent(), and WaitForEvent().
FAT
See File Allocation Table.
FAT File System
The file system on which the EFI file system is based. See File Allocation Table and
System Partition.
File Allocation Table (FAT)
A table that is used to identify the clusters that make up a disk file. File allocation tables
come in three flavors: FAT-12, which uses 12 bits for cluster numbers; FAT-16, which
uses 16 bits; and Fat-32, which allots 32 bits, but only uses 28 (the other 4 bits are
reserved for future use).
File Handle Protocol
A component of the File System Protocol. It provides access to a file or directory. Also
called the EFI File Handle Protocol.
File System Protocol
A protocol that is used during boot services to obtain file-based access to a device. It has
two parts, a Simple File System Protocol that provides a minimal interface for file-type
access to a device, and a File Handle Protocol that provides access to a file or directory.
Firmware
Any software that is included in read-only memory (ROM).
GUID (Globally Unique Identifier)
A 128-bit value used to differentiate services and structures in the boot services
environment. The format of a GUID is defined in Appendix A. See Protocol.
GUID Partition
A contiguous group of sectors on an EFI Hard Disk.
GUID Partition Table
A data structure that describes a GUID Partition. It consists of an GUID Partition
Table Header and, typically, at least one GUID Partition Entry. There are two
partition tables on an EFI Hard Disk: the Primary Partition Table (located in block 1 of
the disk) and a Backup Partition Table (located in the last block of the disk). The Backup
Table is a copy of the Primary Table.
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12/12/00
Version 1.02
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