Hard disk failure: what the symptoms tell you
No spin, a burning smell, clicking: what each sign usually means, and the one rule when data matters.
From the archive: first published on mohamedsharaf.net in September 2013. Rewritten and checked in 2026; some details may be out of date.
When a hard disk dies, the way it behaves usually points to which part failed:
- No power, no spin, no sound, maybe a burning smell or a hot board: the electronics (the circuit board, or PCB) are the likely culprit, often after a power surge or the wrong power supply.
- Clicking or ticking: usually the read/write heads, the most delicate part of the drive.
- Buzzing or beeping without spinning up: often the motor can’t start, or the heads are stuck to the platters.
- Grinding or scraping: physical contact inside the disk. Switch it off immediately.
- Spins normally but very slow, with read errors: bad sectors, often a disk that is wearing out.
The one rule when the data matters
Stop. Every extra power-on of a mechanically failing disk can destroy more data. Don’t open it, don’t freeze it, and don’t run repair tools over and over. Take it to a professional data recovery service, and next time, make sure there is a tested backup. (Checking SMART data regularly helps you see the end coming: see how to read a disk’s age.)