Hey, You can select a whole bunch of files and transfer them to another drive all at once, the Mac goes through them sequentially etc. Additionally though, you can select a second bunch to transfer and it adds a second stream of at the same time. Is it bad to do this? As far as fragmentation and overall speed goes - I imagine there is a bit more overhead as it has to manage multiple file streams. I really want to do it because I think "this file..here..this file..here..this file etc..." but it feels indescribably like a bad idea so I usually do the cmd-select and copy all at once or I wait for the previous one to finish before I start the next. Maybe there is a setting so it won't start that second stream until the first one finishes? Like a queue.