This is a great semi-permanent storage solution for laptops. The only downfall is that they can be misplaced easily, but of course that's my fault, not Sandisk. The write speed is actually faster than the typical size USB 3.0 thumb drives I have by Sandisk. It is super fast in my MacBook. I just reformatted the disk to Mac OS Extended using Disk Utility to help make sure I get the best read/write speeds. I have heard that your Mac won't properly sleep unless the disk is ejected. I usually just shut my Mac down anyways sorry it's not an issue. However, if you keep your MacBook in sleep mode at night, I recommend "ejecting" the drive, then put it in sleep mode. No need to physically take the drive out as far as I know.