Angua wrote:My external harddrive (which I've used fine in the last month or so) has suddenly decided that is is RAW format. It is a Seagate 1tb drive, and had a lot of stuff on it, and now is not there. Is there any way to recover??
There is a good possibility that your data is still there on the drive. The key is to get it off the drive without doing anything to erase or modify it.
There are data recovery programs you can use - here are some examples http://www.techradar.com/news/software/applications/best-free-data-recovery-tools-1321723
I've had good luck with DMDE, and Recuva has worked for me too... any of them on that list are good. Just take your time and read whatever documentation they have; do that and they're all relatively easy to use. Honestly, when these things happen and people do end up losing their data, it's because they rushed into something.
Alternatively, you could try booting your machine into Linux from a USB and reading the drive directly, but you'll probably have more luck with the recovery tools.
In any event, your goal should be to get whatever you can off the drive and onto another drive, before you do anything else. Once you've done that, you could try reformatting the drive and using it for temporary storage... I personally wouldn't trust the drive for anything important again.
All of that said, if you have anything really critical on the disk, you might also consider a data recovery service. They aren't cheap, but might be preferable to losing something really important to you.