gEfiFaultTolerantWriteProtocolGuid

Fault Tolerant Write protocol provides boot-time service to do fault tolerant write capability for block devices.
Include/Protocol/FaultTolerantWrite.h

PROTOCOL Information

PROTOCOL's Guid Name	PROTOCOL's Guid
gEfiFaultTolerantWriteProtocolGuid	{ 0x3EBD9E82, 0x2C78, 0x4DE6, { 0x97, 0x86, 0x8D, 0x4B, 0xFC, 0xB7, 0xC8, 0x81 }}

Refer to Header File

MdeModulePkg/Include/Protocol/FaultTolerantWrite.h