What Happens When an External Hard Drive Fails?

External drives take more physical abuse than any other storage device people own. They get carried in bags, unplugged mid-write, dropped, and left in humid rooms for years between uses.

How they fail

Broadly, in four ways:

• Mechanical — head crash or motor failure in a spinning disk, usually sudden.
• Electronic — the USB bridge board dies while the disk inside is fine.
• Logical — filesystem corruption after an interrupted write.
• Wear — NAND cells in SSDs degrade, often silently, until reads start failing.

What recovery costs

Professional data recovery in India commonly runs from several thousand rupees for a logical repair to tens of thousands for cleanroom work on a mechanical failure, with no guarantee of a complete result. A second copy of the same data costs far less.

Archives are the real risk

The drive holding a decade of photos or completed project files is the one that gets opened least often — which means a failure can go undetected for years until you actually need something from it.