Buffer memory writing method and apparatus and synchronizing method and apparatus for disk cache region

The embodiment of the invention provides a buffer memory writing method and apparatus and a synchronizing method and apparatus for a disk cache region. The buffer memory writing method comprises steps of acquiring to-be-written data of a system, determining the size of the to-be-written data, writing the to-be-written data a data region of a disk when the size of the to-be-written data is larger than a first threshold value, and writing the to-be-written into data and corresponding metadata information into a buffer region of a non-volatile memory storer when the size of the to-be-written data is smaller or equal to the first threshold value. The metadata information comprises a disk address of the to-be-written data, data size and version number; and the version number indicates a sequence number of the to-be-written data updated by the system. The to-be-written data is directly written into the data region of the disk, so large handling capacity data can be buffered without the use of the buffer region of t