Storage · high

How to fixBAD-SEC-UNC

Physically bad sectors found on disk

What this error means

Physically bad sectors found on disk is a high-severity storage drive (SSD/HDD) issue. The HDD surface or SSD memory cell has been permanently damaged. Common triggers are defective cable, power outages and high temperatures in the M.2 slot. Work through the steps below in order.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Back up all data immediately

Back up all data immediately.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Try replacing the SATA data cable

Try replacing the SATA data cable.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Run manufacturer diagnostics

Run manufacturer diagnostics.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • End of life (age)
  • Defective cable
  • Power outages
  • High temperatures in the M.2 slot