Do all external hard drives require a power supply with positive polarity?
Do all external hard drives require a power supply with positive polarity?
I am shopping for an AC/DC power adapter for an external hard drive, and I've noticed that the power supply required for the couple of the external hard drives I looked at is always with positive polarity. This made me wonder: Do all external hard drives require a power supply with positive polarity?
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There's no official standard, but "center-positive" is far more common than "center-negative" for power supply connectors.
There's also drives with a 4-pin DIN connector for 5 and 12v. And there's no standard for which side 5 and 12 are on.
Have killed a disk using the wrong power brick. And it had some data on it I had nowhere else.
Got the data back years later when I bought another similar drive and board swapped them - but this was in the era of 750GB drives where you could do that and it'd actually work.