MdePkg[all]  1.08
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gEfiBlockIoProtocolGuid

Include/Protocol/BlockIo.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiBlockIoProtocolGuid{ 0x964E5B21, 0x6459, 0x11D2, { 0x8E, 0x39, 0x00, 0xA0, 0xC9, 0x69, 0x72, 0x3B }}

Refer to Header File

MdePkg/Include/Protocol/BlockIo.h