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I don't know what you're asking about but if you need a power adapter you can find them cheaply online by searching google or yahoo etc. for the particular brand you need. There are tons of dealers out there with quality reconfigured, rebuilt and even new adaptors for very low prices. Good luck!
First ..this is an usb disk ..and usually it does not need an external power supply but in special cases when it is plugged in something it can not sustain it ..i understood it does have a power supply plug ..but ..I repeat ..it should work on the usb alone ..and get the power from it .. If you experience some issues and need to know if ti will work when you power it external ..the values are written on the back of teh drive ..or near the plug ..You will only need to have the right jack ..and the voltage to match ..beware of any higher voltage ..it may damage it right the way ..
Have you got the original power adapter?
If so the voltage details are printed on the label on the bottom of the adapter.
If the external USB Seagate hard drive houses a 31/2" drive then it requires an power adapter that provides +12 volts and +5 volts both supplying approx 2000mA of current.
If the Seagate uses a 21/2" (laptop) hard drive then it only requires +5 volts power adapter.
The only problem is the power connector to the external drive, make sure it suits the external hard drive unit and the power pins are correctly wired for the Seagate. If the polarity of the plug is incorrect lt wired (ie reverse polarity) then it could damage the USB hard drive and adapter case.
You need to make sure that you get a compatible power adapter for that model. Most of Acomdata external drives use a 12v adapter, but not all. If you plug the wrong voltage into the drive, you do have the possiblity of frying your external. I'd check with your manual or post back your model number so I can look that adapter up.