The author actually addresses this in a reddit topic. https://www.reddit.com/r/rust/comments/mk2nz8/ordering_requests_to_accelerate_random_disk_io/gte63ud http

The author actually addresses this in a reddit topic. https://www.reddit.com/r/rust/comments/mk2nz8/ordering_requests_to_accelerate_random_disk_io/gte63ud https://www.reddit.com/r/rust/comments/mk2nz8/ordering_reque... "NCQ does it's best to order all of the outstanding commands at a moment in time (so maybe 32). This is instead submitting the commands in the optimal order to start with." The thread contains more details.