That's a fairly common compression technique on PS3 titles. Breaking the file into regularly sized chunks about 64kb (for lzma) permits decompression of the fil

That's a fairly common compression technique on PS3 titles. Breaking the file into regularly sized chunks about 64kb (for lzma) permits decompression of the file in parallel on the SPUs as the dictionary and decompressed data can fit entirely in local store. Since optical drives have terrible seek times and low bandwidth most assets are stored compressed on disc.