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There are at least 4 versions of this drive. The latest take a 5VDC power supply; earlier ones take a 9VAC; still earlier ones take something like 13.8VAC. To be 100% sure, you have to look at the innards, if you can't find any voltage rating on the outside.

Opening one of these things is a little tricky. But fear not, there are some ways around the problem.

If it's an all-metal-cased unit with a permanently attached cable, either a 13.8VAC or 9VAC power supply will work, if it's a 3½" unit. If it's a 5¼" drive, you need the 13.8VAC supply.
If it's a plastic-housed 3½" drive, look at the back plate, near the power switch and power connector. If, slightly above and to the left of the power connector, there's a screw head, you need a 9VAC power supply.
If, instead you see a hole in the aluminum plate, not filled with a screw, you need to use a 5VDC power supply.


As far as the ratings, if you've got a 5¼" unit, you should have at least a 1200 mA supply current. The 3½" units will work fine with 800 mA. The 5VDC supply is 1600mA with center pin positive/shell negative.

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