Hard drive not spinning or making no sound? Read this

Most failing hard drives make some sort of noise: clicking, beeping or grinding. A drive that makes no sound at all can be more confusing. You plug it in and nothing happens: no spin-up, no faint vibration, no light on the enclosure, and the computer does not see it. Sometimes this follows a power cut, a surge, or plugging in the wrong power adapter; sometimes there is a burnt smell. A completely silent drive usually points to an electronics fault rather than damage inside the drive, and that often means the data is still intact. How you handle it now decides whether it stays that way.

What a silent, non-spinning drive usually means

When a hard drive gets power, the circuit board (PCB) on the underside starts the motor and the platters spin up within a few seconds. If there is no spin at all, the most common causes are:

• A failed PCB. Power surges, faulty power supplies and static can kill components on the board.
• A shorted protection diode. Many drives have TVS diodes that short out to protect the rest of the board from over-voltage. The drive then appears dead, and a power supply may shut itself down when the drive is connected.
• The wrong power adapter. Desktop external drives such as larger WD and Seagate models use a separate mains adapter. Using an adapter with the wrong voltage or polarity is a classic way to damage the board.
• A failed USB bridge board in an external drive, rather than the drive itself.
• A seized motor or stuck heads. These usually cause a hum or buzz rather than total silence, but a quiet drive is not always an electronic fault.

Safe checks you can do

1. Check the power source. For a desktop external drive, confirm you are using its original adapter and that the adapter works. For a portable drive, try a different USB cable and a USB port directly on the computer, not a hub.
2. Feel for vibration. Hold the drive gently while it is connected. A faint spin or a pulsing hum is useful information to give an engineer.
3. Use your nose. A burnt or electrical smell means a component has failed. Disconnect it and do not keep reapplying power.
4. Try once, not twenty times. Repeatedly powering a drive with a short on the board can spread damage.

Why swapping the circuit board rarely works now

It is tempting to buy an identical board online and swap it over. On drives from the last fifteen years or so, that almost never works on its own. Each drive is calibrated individually at the factory, and part of that unique information (often called adaptives) is stored in a small ROM chip on the board, or inside the main controller chip. A board from another drive carries the wrong values, so the drive may spin and click, fail to identify, or behave unpredictably.

A board replacement done properly involves moving or reprogramming the ROM data from the original board, matching board revision and firmware, and in many cases repairing the original board instead. Done badly, it can turn a simple electronics fault into a drive that also damages its heads or platters. Damage is also not always limited to the board. A surge strong enough to kill the PCB can sometimes affect the motor or the head preamplifier inside the drive, which needs clean-room work.

What not to do

• Do not fit a “matching” board bought online without transferring the ROM.
• Do not cut or remove diodes or other components to “get it working”.
• Do not open the drive case to look inside. Dust on the platters causes permanent damage.
• Do not use a different, unknown power adapter to test it.
• Do not put the drive in the freezer; that advice is out of date and can cause condensation.

How a lab approaches a silent drive

An engineer first checks the board for shorts and damaged components and works out whether the fault is electronic only. If it is, the board is repaired or a compatible board is prepared with the original drive’s unique data. Once the drive powers up, it is checked for further problems, and the data is copied to a healthy drive under controlled conditions before anything is extracted. If the heads or motor are affected too, that work is done in a clean environment. Our pages on Western Digital hard drive data recovery and Seagate hard drive data recovery describe common faults on those brands.

Preventing a repeat

• Keep each external drive’s power adapter labelled and with the drive.
• Use a surge-protected extension lead, or a UPS for desktops and NAS units.
• Do not rely on a single external drive as your only backup; keep a second copy elsewhere or in the cloud.

Get a free assessment

If your hard drive is silent and you need the files back, stop powering it and call Data Retrieval on 020 7064 4996. We offer a free assessment with no obligation, or you can request a quote online.