In a file system enabled for large files, the data stored before the 4 MB file offset is allocated in 4096 byte blocks.
File data stored beyond the 4 MB file offset is allocated with large disk blocks of 128 KB in size.
The large disk blocks are actually 32 contiguous 4096 byte blocks.
In the example above, a 132 MB file in a file system enabled for large files has 1024 4 KB disk blocks and 1024 128 KB disk blocks for a total of 2048 blocks.