Storage · critical

How to fix Disk read error at startup

Storage troubleshooting guide

What this error means

Windows reports 'A disk read error occurred' when booting. PC won't boot. The usual suspects are corrupted MBR and allowed SATA cable.

Updated

Before you begin

Save open work and back up important files. Use instructions for your exact device and software version. If Windows cannot start, see the startup guide.

Work through these checks

0 of 4 complete
01Reconnect the SATA/NVMe cable
  1. Reconnect the SATA/NVMe cable
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors
02bootrec /fixmbr and /fixboot
  1. bootrec /fixmbr and /fixboot
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors
03Run Startup Repair from USB
  1. Run Startup Repair from USB
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors
04Check the disk in another PC
  1. Check the disk in another PC
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors

Possible causes

  • Defective disk or cable
  • Corrupted MBR
  • Bad boot sector
  • Allowed SATA cable