“Most MacBook users are familiar with the Disk Not Ejected Properly notification,” Harry Guinness writes for Tuts+. “Getting an alert when you rip a USB key out while your still running Mac is one thing, but getting one after you delicately unplug your external hard drives from your sleeping Mac so that you can put it in your bag is a different story.”
“The issue is that OS X leaves external drives mounted during sleep mode, and gives no options to change that behavior,” Guinness writes. “Jettison is a lightweight app, available for $1.99 [from Apple’s Mac App Store], that solves this problem.”
“It lives in your menu bar and detects when your Mac is going to sleep. When it does, it unmounts all your external volumes. This means you can unplug your external drives without having to wake your Mac to eject them,” Guinness writes. “Even better, if you put your Mac to sleep but decide not to unplug everything, Jettison will remount them automatically.”
Much more (keeping your Mac awake, how to click without clicking, efficiently switching screen resolutions, and more) in the full article here.