You might think:
- No, it is NTFS
- No, hard drive is just 1 year old
- No, it is Vista and it has been tested for ages
- No, I always check in as soon as it is ready

But, it happened on Monday. When the deadline was on Friday and you need to finished and ship it "yesterday". Source folder with sources not check in for 2 working days reported corrupted and not accessible. Go change you pants and run check disk.

Post Mortem: I lost 4 hours waiting for data recovery application and check disk. No data has been lost. It was good lesson. Thanks!