+/**\r
+ Read BufferSize bytes from Offset into Buffer.\r
+ Writes may require a read modify write to support writes that are not\r
+ aligned on sector boundaries. There are three cases:\r
+ UnderRun - The first byte is not on a sector boundary or the write request\r
+ is less than a sector in length. Read modify write is required.\r
+ Aligned - A write of N contiguous sectors.\r
+ OverRun - The last byte is not on a sector boundary. Read modified write\r
+ required.\r
+\r
+ @param This Protocol instance pointer.\r
+ @param MediaId Id of the media, changes every time the media is replaced.\r
+ @param Offset The starting byte offset to read from\r
+ @param BufferSize Size of Buffer\r
+ @param Buffer Buffer containing read data\r
+\r
+ @retval EFI_SUCCESS The data was written correctly to the device.\r
+ @retval EFI_WRITE_PROTECTED The device can not be written to.\r
+ @retval EFI_DEVICE_ERROR The device reported an error while performing the write.\r
+ @retval EFI_NO_MEDIA There is no media in the device.\r
+ @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.\r
+ @retval EFI_INVALID_PARAMETER The write request contains device addresses that are not\r
+ valid for the device.\r
+\r
+**/\r