Patent ID: 7191197

Claim:
A storage control apparatus comprising: a disk storage area A in which data is stored according to a recording format α; a disk storage area B in which data is stored according to a recording format β, said recording format β being a format different from said recording format α; an intermediate disk storage area in which data is stored according to said recording format β; a data IO unit x operatively coupled to said disk storage area A, and configured for receiving a data IO request from a first computer to exchange data with said disk storage area A; a data IO unit y operatively coupled to said disk storage area B, and configured for receiving a data IO request from a second computer to exchange data with said disk storage area B; a data recording format conversion unit X configured to perform steps of: detecting that data to be transferred has been completely written to an area of said disk storage area A according to said format a in response to a write operation, securing storage areas for a data set and an end flag data set on said intermediate disk storage area, writing said data to be transferred into said data set according to said recording format β upon completion of said write operation, and writing an end flag indicating that said write operation is complete; and a data transfer unit configured to transfer data from said data set to said disk storage area B when said end flag is written to said end flag data set.