Try attaching the drive to an OS 9 system.
When my first LaCie 500GB drive died (a LaCie drive die? what?! 😉 ) I was able to get everything off by connecting the drive to an OS 9 system.
When my second LaCie 500GB drive died, I had prepared enough to deal with it.
I had a total of three LaCie 500GB drives, two are dead, the third is still going (with a fan pointed at it 24/7) but I will replace it before it goes on its down.
— Wes Plate
Automatic Duck