Yes — and it’s one of the most common causes of hard drive failure we see at SouthBit. South Africa’s ongoing power instability means we regularly recover data from drives damaged by loadshedding and the power surges that follow.

How loadshedding damages storage devices

The danger isn’t the power going off — it’s the power coming back on. When Eskom restores supply, the initial surge can spike well above the normal 230V. If your computer or external drive is plugged in and switched on at the wall, that spike travels straight to the drive’s circuit board.

On hard drives, a power surge can blow the TVS diode (a protective component), fry the motor controller IC, or damage the preamp chip on the head stack. On SSDs, surges can destroy the power management IC or the controller chip, sometimes corrupting the firmware in the process.

Even if the power doesn’t surge, an abrupt shutdown during a write operation can cause firmware corruption. The drive’s internal software relies on completing write cycles cleanly. An unexpected power cut mid-write can leave the firmware in an inconsistent state, causing the drive to become unresponsive on the next boot.

Signs of surge damage

After a power event, your drive may show no signs of life at all — no spin-up sound, not detected by the computer. Or it may click repeatedly, indicating the heads can no longer initialise properly. SSDs may simply disappear from the system entirely.

If a burnt smell is coming from the drive, do not plug it in again. The PCB has sustained component damage.

How to protect your drives

Use a quality surge protector or UPS (uninterruptible power supply) for all computers and external drives. During scheduled loadshedding, switch off equipment at the wall — not just the power button — before the outage begins. This prevents the return surge from reaching your devices.

Most importantly: maintain backups. Even the best surge protection isn’t foolproof.

Recovery from surge-damaged drives

SouthBit regularly recovers data from surge-damaged drives. PCB repair with ROM chip transfer, head replacement, and firmware repair are all routine procedures in our lab. Assessment is free, and if we can’t recover your data, you don’t pay.

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