Reply to dead external HDD advise

kind of as the title states my external drive containing all my sample library and software install files and DJTT ableton sound packs has decided to corrupt itself on me and ive forgotten half the sample libraries ive paid for over time so would love to find someway of recovering the data if possible.

system is OSX 10.7.5
drive is a 1TB usb3 WD mypassport

any advise is welcome