Intel Extensible Firmware Interface - Manual (Page 406)

Extensible Firmware Interface Specification
11-46 12/01/02 Version 1.10
Status Codes Returned
EFI_SUCCESS The data was read correctly from the device.
EFI_DEVICE_ERROR The device reported an error while attempting to perform the read
operation.
EFI_NO_MEDIA There is no media in the device.
EFI_MEDIA_CHANGED The MediaId is not for the current media.
EFI_BAD_BUFFER_SIZE The BufferSize parameter is not a multiple of the intrinsic block
size of the device.
EFI_INVALID_PARAMETER The read request contains LBAs that are not valid, or the buffer is not
on proper alignment.