A method and apparatus for automatically transferring i/o blocks between a host system and a host adapter

The input-output (I / O) system on the input and output host adapter 116 processes the input output request that is sent to the host computer 102, a plurality of disk drives, or other output device from the (132 to 134). The host adapter 116 comprises a request queue 110, input output request to the host adapter, the memory 138, the request buffer 210 from the (command block) circuit for transmitting automatically (202) on the host memory 106. In addition, the host adapter includes a circuit for automatically transmitting the input and output response (status block), in the response queue 212, the host system memory 102 to the response buffer 212, the host adapter memory 138. By automating the transfer operation, the processing load on the processor 112, the host adapter 116 is reduced.