I have a 5 year old Seagate external hard drive that was failing to mount to my MacBook. After swapping out USB cables and power supplies, I concluded I had a bad AC adapter. This replacement fulfills my needs splendidly and affordably. I am knocking one star on this review because one of the three included tips was badly molded (see photo) and I would assume possibly dangerous. I didn't need that specific tip for my application, so I will toss it out.
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