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I had the same problem with a 1TB hard drive. The fault was caused by the casing being knocked from the computer and falling onto the desk. If the hard drive hadn't been powered up it would have been ok... I removed the hard drive from the casing and fitted it into my computer as a slave drive, hoping to access all the music and movies stored in it. No go .. But, it's worth you fitting your hard drive as a slave and trying the same. It's worth a shot. I took the hard drive to a computer market here in China, where I work. These guys take hard drives apart to fix them, if possible. They couldn't fix my hard drive as it had been powered on when it fell .. However, I bought a new desktop hard drive and they were able to transfer 95% of all things from the old hard drive to the new one. The cost of transferring from the old hard drive to the new hard drive was the same as the price of the new hard drive. That specialist service doesn't come cheap ... but it can be done. I paid simply because I didn't want to lose what had taken more than a year to download. Try fitting your hard drive as a slave to see if you can access the information on it. If not, a new hard drive and the cost of transferring your music from your old hard drive may be the only course of action left open to you
This situation indicates a problem with the built-in self tests. Most likely a power supply failure. I don't believe it is economically feasible to replace the power supply. If it is still under warranty, I'd go through the procedure to get it repaired/replaced. Otherwise, you'll need to replace the unit.
A continuous flashing light on a Lacie drive is a notification of a problem. I do wonder if the light is flashing the same if the drive is plugged in to the Mac or unplugged.
Lacie external drives tend to have power-supplies which become weak/bad. Most users replace the supply and it will work again for awhile until the supply dies again. Try bringing the drive to a retail dealer with Lacie drives -ask them if you can just test your drive with another power-supply (if you do not have another). You can also try calling Lacie, it's always slightly possible they will be aware of this problem.
Alternately, IF the light is only flashing when the drive is plugged-in to the computer, try using a different USB or Firewire cable.
We have a few of these Lacie Design by F.A. Porsche 500GB drives in our office. Our editor's drive stop working this morning (was fine the day before) and had all her files backed up from the last three years on it and was making a very soft clicking sound. After taking the whole thing apart and trying drive in another F.A. Porsche caddy with no success, we tried a different power supply hey presto it started up no problems. My drive that suddenly stop working earlier in the year we tried a power supply from a external Lacie DVD Writer and again drive is working. Just to make sure tried the original power supply and would not mount. So if your hard drive stops working it maybe the power supply rather the the hard drive.
Power loss on a drive even if it is not transferring could be severe. Especially with Lacie gear. The bridgeboard ( which is the chip that transfers the content between the drive and the ports on the enclosure ) can fail instantainously if power varies or is cut. The major concern is if the internal drive is effected ( in the enclosure .)