Intel Extensible Firmware Interface Specification page 212

Extensible Firmware Interface Specification
Status Codes Returned
EFI_SUCCESS
EFI_NOT_FOUND
EFI_NO_MEDIA
EFI_MEDIA_CHANGED
EFI_DEVICE_ERROR
EFI_VOLUME_CORRUPTED
EFI_WRITE_PROTECTED
EFI_ACCESS_DENIED
EFI_OUT_OF_RESOURCES
EFI_VOLUME_FULL
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The file was opened.
The specified file could not be found on the device.
The device has no medium.
The device has a different medium in it or the medium is no
longer supported.
The device reported an error.
The file system structures are corrupted.
An attempt was made to create a file, or open a file for write
when the media is write protected.
The service denied access to the file.
Not enough resources were available to open the file.
The volume is full.
12/12/00 Version 1.02