It resembles the RIFF bitstream format in the sense that it stores data in â chunksâ . It is also close to the IFF and the AIFF format used on Amiga and Macintosh computers , respectively . It is an application of the RIFF bitstream format method for storing data in `` chunks '' , and thus is also close to the 8SVX and the AIFF format used on Amiga and Macintosh computers , respectively .