If it's only half a year old, back it up and RMA it.
If you are overly concerned about backing up data from the drive, make an Ubuntu live CD (the iso can be found on
http://www.ubuntu.com/) and copy the files to an alternate location.
If the drive has already failed, there is a re-mixed version of Ubuntu known as the Ubuntu Rescue Remix (http://ubuntu-rescue-remix.org/). If you don't want to get out of Windows while doing this, GetBackData is a tool I have had to use a few times and is a good one.
While doing recoveries, remember to have enough free space on another disc to accommodate for the data which is recovered.