Just one thought. You say your card has failed, but you don't say how.
It is a very large card and if you are downloading through camera software, sometimes the old software isn't capable of taking the larger memory cards.
Eg. I always used Canon Zoombrowser for downloading, but when I got a 2 Gb it would not recognise it. My husband then bought one of these tiny Canons with the latest Zoombrowser and I can download 2 Gb cards through this.
Of course, your card might just be showing ERROR