US Patent 7783796 Method for releasing data of storage apparatus

The present invention provides a method for releasing data of a storage apparatus. The method manages the data output of the storage apparatus by using a virtual output queue, a data storing memory, and a bit map output port memory. In such method, the output ports, which use the data stored in any data column of the data storing memory, are recorded in the bit map output port memory. In addition, the addresses of the data storing memory for storing the data output from any output port are provided by the virtual output queue. After all data of a certain data column is completed read out, the data storing column in the data storing memory and a corresponding part of the bit map output port memory are released by the storage apparatus.