IEEE 1394 Asynchronous Request May Time Out Due to Dropped Response from Remote Node
When an IEEE 1394 device is connected to a computer running Windows and asynchronous data transfers are being performed between the host computer and the device, an asynchronous data transfer requested by the host computer may complete with an error status of 0xC00000B5 (STATUS_IO_TIMEOUT). The asynchronous request may time out even though an IEEE 1394 bus trace shows that a valid asynchronous response was received from the device and successfully acknowledged by the host computer with an “ack_complete” code.
Such asynchronous requests may include asynchronous write, read, or lock requests (REQUEST_ASYNC_WRITE, REQUEST_ASYNC_READ, or REQUEST_ASYNC_LOCK, respectively).
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2519460.