System and method for accessing and verifying the validity of data content stored in the cache memory on disk

A method for accessing and verifying validity of data content stored in a cache memory on a disk, the method being applied to a data accessing system through use of a master disk controller along with at least a backup disk controller, wherein the slave disk controller takes over the data accessing work from the master disk controller, when the master disk controller malfunctions, and, for data accessing purposes, separate storage spaces in the cache memory on the disk are available to the master and the slave disk controllers to temporarily store and access related data;

• the method for accessing and verifying the validity of data content stored in the cache memory on a disk comprising the steps of:
• creating a recording area for recording accessed records identifying the disk controller accessing the disk;
• and
• making the master disk controller read the accessed records in the recording area, and, upon power-on, determining whether the accessed records show that the disk was accessed by the master disk controller, wherein, if the record shows that the disk was accessed by the master disk controller, the master disk controller will access the disk with the data content stored in the storage space in the cache memory of the master disk controller, and, after power-on, if the record shows that the disk was accessed by the slave disk controller, the master disk controller will invalidate the data content stored in the storage space in the cache memory of master disk controller as invalid.