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Open it up and look inside. Some enclosures use screws others use plastic clips which may require a tool thinner than a credit card to release the clips.
The Internal Drive...Is it a 2.5" drive that runs on 5 volt or a 3.5" drive that uses combined 12 volt & 5 Volt power supply.
These drives don't use much current. 1 to 2 Amp
The adapter may have had a single voltage output for 2.5" drives or a dual voltage supply for the 3.5" Probably 12v or 5v
Anyhow, there are lots of hard drive empty enclosures that can be bought... as hard drives internally use a standard connection for data & power. Just swap the internal HD over to a new enclosure.
Hope this Helps
Trevor
SOURCE: please i need the power adapter rating for seagate
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.
SOURCE: Need to know Amps & Volt. for Simpletech "Simple Drive" 1Tb.
The output of your adapter is 12volts 1.5amps the outside terminal is negative polarity and your connector looks like this (see below)
There are two options of adapter (see below) both will work 
EBAY Search for your adapter
SOURCE: I have a Toshiba 3.5
This should be the adapter you need: http://www.toshibadirect.com/td/b2c/adet.to?poid=450254
SOURCE: power cord
If the voltage is the same, and the current of your replacement adapter is equal to / greater than the original, it should work perfectly fine.
BUT..
The only thing to pay attention to is if it is AC or DC. AC requires nothing more for you to do. DC however, will require that you have the proper polarity: PLUS (+) and MINUS (-) on the mating plug contact points. If you guess at this, you have a 50/50 chance of turning it into "toast". If the socket is unmarked, contact the manufacturer to obtain polarity information BEFORE connecting!
Good luck!
Testimonial: "Dear Steve,thank you for your quick responce. I made the mistake of pluging it in and it did say DC on the hard drive. I was stupid and lucky because it seems to be woking fine. Should I asume that the polarity: PLUS (+) and MINUS (-) on the mating plug contact points are correct or could it still turn to toast? THANKS once again, Gordy"
There are two options of adapter (see below) both will work 
1) your car adapter, the red color wire is + pole which connect to the hole of jack(tip), the black wire is - pole which connet to outcover metal of the jack(tip). that is very common. 290 views
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