Maybe this can help.
http://www.wikihow.com/Recover-a-Dead-Hard-Disk

 

what do u mean by this? No HDD manufacturer will recover your data for you.? seagate will but at a price :S seagate is really bad with returns and stuff definatly my last seagate product im buying even their website has issues like theres heaps of spelling mistakes thats not quite engRISH, its like a chinese person whos 80% fluent in english has written it like theyve left out words in sentences.

 

To recover data, they need to use a specialized machine to open up the HDD and read the data off each platter, sector by sector. The machine and its running costs are very, very high - that is what Peseid means by "No HDD manufacturer will recover your data for you". It's just not economically viable for them to include that in any warranty.

If the enclosure really is dead (i.e. no way to access the drive), you can try opening it up and putting it in a computer directly to see if the drive and its data is still intact. If not, then there's little you can do aside from get a replacement. Unfortunately this is the fate that befell my external SeaGate 1TB drive, except that it's outside the warranty period so I can't claim.

In future, be very wary about getting external drives. Look for build quality and for how securely the cables plug in. 80% of all enclosures in the market are very shoddy and (based on what I've seen over the years) I predict will fail within 15 months. Also, if you can, avoid SeaGate. They used to be great but now WD and Samsung Spinpoint drives are much better (not to mention cheaper).

 

This is what happens when you don't backup your data.

Hopefully you learned your lesson.

 

Seagate is crap, you want something like Western Digital or Toshiba. I have a Toshiba 640 GB hard drive for my Wii and movies and it has never failed me.

 

The best solution is to simply purchase an internal drive, and pick your own enclosure. That way you know you're getting a quality piece of hardware (in addition to active cooling if you're so inclined, which the el-cheapo pre-built external drives rarely have).