https://marco.org/2009/11/25/another-reason-i-love-the-15-macbook-pro-the
Another reason I love the 15” MacBook Pro: The MacBook Air could never run two simultaneous transfers when transferring big video files from my desktop for a plane ride, especially not at anywhere near this speed. (17 MB/s up from SD card, 77 MB/s down to disk.)
I’ve never even seen a non-SSD laptop drive that could perform a sustained write at over 50 MB/s.