Portable Hard Drive Problem - NEED URGENT HELP

Hi Can anyone help?

I have a Lacie Portable Hardrive with 500 GBs of data that I need to backup.

I'm on 10.6.7

It is recognised on my mac but it can't open or copy any of the files over.

I've got Diskwarrior but I can't Graph it or Rebuild it.

'It says error 2153'

This is really urgent as there is some really important files that I need.

I'm also using AppleXsoft file recovery for Mac Demo to see if that works. Scanning for lost files???

Kind Regards for any advice.