I think I fried my LACIE 500gb drive

what os do you have

I have the same one. The power supply I have says input 100-240V output is 24W 12V 2A.
I'm replacing the power supply but my big problem is not knowing the polarity of the tip There is no sticker on the hard drive itself or on the power supply (that I suspect is fried). Can anyone help?
Lisa

Same here. I pulled the drive from the case and swapped it with another and the drive works fine. Must be the control board inside the case. Where can we find the replacement board?

You're not missing any step at all, because with SATA hard drive if its really working your computer should
automatically detect it and since this hard drive suddenly stop working there's a possibility that its already
fried but if you want you can try this hard drive again to a different computer and if still not detected by
second computer its already dead.........

Contact Lacie support for a new power supply. I had the same problem, contacted Lacie support, they sent me a new power supply with power cord and all is well now.

500Gb Lacie D2 Quadra with the same problem of flashing led and not mounting on the desktop (Mac G4 Mirror), traced to the power supply (57w) going down on power, both 12v and 5v supplies are available but the main power to run the drive drops to below an adequate output, hence the clicking and whirring evident from the drive with simultaneous flashing led.

Testing with another Lacie power supply (250Gb D2) this time a 34w unit got the drive up and running, however, and this is the reason for this post, this lower power PSU failed a week later whilst waiting for a warranty replacement from Lacie (5 weeks and still waiting for the new PSU from them. they have no stock)

Message for all Lacie D2 users, check the power supplies first, test with another Lacie PSU, do not run the drive on a lower rating (34w) PSU it will fry it and leave you with another failed power supply.

If you are in a tight spot use the temporary power supply to move your data to another drive and get the correct 57w power supply before running the drive again.

Don't do as I did assume any Lacie power supply will run any Lacie hard drive, they won't, fortunately I had a second back up, but am 2 drives down and no new PSU's available to buy anywhere.

Try and purchase another spare 57w power supply, something all D2 users should do for long term security, as these do not seem to be very reliable and getting warranty support from Lacie on these is currently impossible.

The lack of 57w power supplies from Lacie and its distributors across the world is surely a warning to be noted!!!!!!

Buyers beware!

Both power adaptors are 4 pin, ITHINK that the Porsche that you have is the same as mine which has the smaller (4 pin DIN) plug 34W power supply.
But check on LaCie's site: http://www.lacie.com/asia/products/product.htm?pid=10857
Hope this helps.
Chris 

Listen to your power supply and see if it is making a faint buzzing noise. Try your device with a new power supply. With a new power supply my drive now runs fine, and was not corrupted.

Maybe the usb chip in the hard drive enclosure that converts ide into usb failed. You could replace the enclosure (they sell enclosures at best buy) but it could be quite a hassle.