Rechunk000pak Better

If the inquiry was regarding "rechunking better," the solution lies in utilizing the Rechunker algorithm, maintaining chunk sizes between 10-100 MB, and aligning chunk shapes with query patterns.

If you keep the same chunk size but reorder chunks: rechunk000pak better

For large PAK files (> 4 GB), mmap() (or CreateFileMapping on Windows) avoids loading the whole file into RAM.
Use MAP_PRIVATE to safely read chunks. If the inquiry was regarding "rechunking better," the

Better: memory-map both source and output. If you keep the same chunk size but reorder chunks: