Patent ID: 8332573

Claim:
An address mapping method performed in a virtual file system of a storage unit having a plurality of non-volatile data storage media, the method comprising: determining a block group including at least two blocks included in each of the plurality of non-volatile data storage media; determining an access unit including each page included in the determined block group; and mapping an address of input/output data to the determined block group and access unit, wherein the block group includes a plurality of blocks having the same block number from among a plurality of blocks included in each of the plurality of non-volatile data storage media, wherein a relationship between the block group and each block within the block group is defined by a relational expression in a block group map table, the relational expression comprising a first field that identifies a block group number and a plurality of second fields which collectively identify each block within the block group, the plurality of second fields identifying respective blocks in a set of blocks in the block group that are in same relative position in each of the plurality of non-volatile data storage media, and wherein a total number of the plurality of second fields in the block group is less than a total number of blocks within the block group.