Question about Seagate 500GB USB 20 5400RPM Portable 500 GB Hard Drive

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My External HDD's adapter blow and i want to know if any 12v adapter will make it work?

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Be careful, not all 12 Volt adaptors are the same. Some put out AC voltage and others DC. You need a 12 V DC adaptor. The adaptors are polralized, that is one output wire is + 12 V and the other is - 12V.. If you connect it backwards you can blow your hard drive.
If your not sure regarding correct polarity, consult a technician who knows how to use a voltmeter.
Also, the current rating of the replacement adaptor must be equal to or greater than the currenr rating of the original. Example: Old adaptor = 375 Ma. , New adaptor = 750 Ma. This would be OK.
If you have any additional questions contact me by clicking on the "Add a comment" link located under your problem description on FixYa. Also, if you believe that this information was helpful to you, please return to the FixYa website and rate my response to your question.
Best regards,

Posted on Jan 02, 2011

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What is the AC DC adapter spec for SEAGATE 9NK2AE-500. i lost the original adapter that came with this external seagate freeagent harddrive.

most of these external hard drive units work with a 12V 3 amp DC power supply like this one

Make sure you get the correct power connector for your country.

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Usually there is a diode in place to prevent spurious voltage reaching the hard drive. Replacing the power supply may work. I would replace the whole enclosure.

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Could well be the power adapter. They seem to fail quite often. AFAIK, it is a 12V / 2A adapter, so it should be easy to find a suitable replacement. Just make sure that it is a switching adapter with stabilized output voltage.

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1 Answer

Unusual Power Requirement

Should not be a problem, the theory here is Volts * Amps =Watts

5V * 2A = 10w

The alternative is to get a LM7505 ($1 or 2) from radioshack or any electronic supply and regulate the 12v down to 5v. its about 1/2 square IC chip.

Pardon my ASCII:
input 1.7V - 35V ________| | |_____ +5v (+/- 1%)
Pin 1 Pin 3

will accomodate 1 Amp (1.25 if heat sinked) for the CMOS version, slightly higher for the olde r(less effecient) version

The other pin is ground. OF course you will want to check the specs and pin assignment for the brand you buy, these are typical.


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Power Adapter for Mactor OneTouch 4

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I have the 320GB Simpletech External Hard Drive.
The AC adapter Model number is SAWA-05-153
The output is +12V --- 1.5A

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