USB has no power when computer sleeps

When my computer goes into sleep mode, time machine cannot connect to my external HD because apparently the usb port goes to sleep along with the computer. Same thing happens when i plug my iphone to charge. I plug in my iphone, shows that it's charging, I put the computer to sleep, it stops charging instantly. I have two imac computers, same thing happens on both machines. Is there anyway to keep the power to the usb ports while the computer sleeps?

Hi there, Welcome to the Apple Support Forums. What I say is just my own opinion. We all work in many different ways.
I can't see any benefit to keeping a USB port fired up to keep a hard drive running, when the computer and Time Machine are both asleep. If nothing is happening or changing on your computer then there's not much point of keeping a Time Machine drive running. In addition, I wouldn't consider using a USB powered drive for something important like a backup system. USB powered devices can be pretty flakey.
Meanwhile, as far as a charger for an iPhone, this year at MacWorld SF, I bought a Griffin Simplifi dock. It also doubles as a memory card reader, and has two USB ports for thumb drives or whatever. It's got it's own AC power adapter so I don't worry about the computer going to sleep or even shutting it down.
Amazon has the Simplify device for $42 w/free shipping. I leave my iPhone in the dock whenever I'm around the office. I think I paid around $70 at the show and don't regret it a bit.
Apple also provided you with a small square AC power adapter for a USB cable to connect to charge your iPhone (at least they did with mine). But I really like having the dock sitting just in front of my Mac.
Message was edited by: dechamp

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