1. Slowed Down Computer – Frequent freezes or Blue Screen Of Death

2. Corrupted Data – If you’re beginning to find files that fail to open, are corrupted even though they saved without errors, or if files suddenly disappear, you should get worried.

3. Accumulation Of Bad Sectors – Bad sectors are areas of the hard drive that do not maintain data integrity.

4. Strange Sounds – When you hear strange noises coming from your hard drive, it may be too late already.

5. S.M.A.R.T. Data – There are tools that aim to predict hard drive failure by reading the S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) data that is recorded by the operating system.