Too late now, but whenever I get a new toy with a wallwart power adapter, I get a sticky label and write on it what it belongs to. I've had this problem myself. I do not know the specs for your drive, but usually it is on a plate on the device, or may be molded discreetly into the case near the power socket. You may need a magnifying glass as this is often tiny, but look for a line that looks something like: 5v --(*-- 750 mA You will usually find this on both the device and power supply. This means 5v power, and the "(*" represents a 3/4 circle with a spot in the middle. One line goes to the circle, the other goes through the open part of the circle to the spot. Sorry the diagram isn't very close to reality... but the character set is limited. The side that goes to the circle represents the outer surface of the power plug, the spot represents inner connector. That makes it a 5v power supply, center positive. The 750 mA is the current the device requires/the power supply can deliver. When matching power supply to the device, the polarity symbols on device and power supply must match exactly. It is absolutely essential that the polarity is right - centre positive or centre negative. Getting this wrong will usually destroy the device almost immediately. The current rating is not quite so particular. Very often, the right power supply will have same current rating as the device, but it is usually ok for the power supply to have a higher rating (within reason). To make life difficult, the current may be rated in amps (A)or milliamps (mA). Since 1 Amp = 1000 milliamps, it is easy to convert if necessary - 1.5A is same as 1500 mA. Fortunately most devices are marked with their power requirements. Just a few are not. I Hope yours is marked, and this helps you find the right power adapter.