This information level structure is used in TRANS2_SET_FILE_INFORMATION (section requests to set allocation size information for the file specified in the request.<184>

   LARGE_INTEGER AllocationSize;

AllocationSize: (8 bytes): A 64-bit signed integer containing the file allocation size, in bytes. Usually, this value is a multiple of the sector or cluster size of the underlying physical device. This value MUST be greater than or equal to 0x0000000000000000. All unused allocation (beyond EOF) is freed.