Apps & runtime · high

How to fixSTEAM_DISK_WRITE_ERROR

Steam Disk Write Error

What this error means

Steam Disk Write Error is a high-severity software runtime issue. Steam download or update is interrupted because Steam cannot write game files to your storage drive. Typically caused by folder permission conflicts, corrupted drive sectors, or active antivirus lockups. The steps below are ordered to resolve this efficiently.

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 5 complete
01Run Steam as Administrator to bypass folder permission locks.

Run Steam as Administrator to bypass folder permission locks..

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

I need help
02Clear Steam Download Cache via Steam Settings -> Downloads -> Clear Cache.

Clear Steam Download Cache via Steam Settings -> Downloads -> Clear Cache..

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

I need help
03Verify and repair the Steam library folder through Steam Settings -> Storage.

Verify and repair the Steam library folder through Steam Settings -> Storage..

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

I need help
04Add an antivirus exclusion rule for the Steam installation directory.

Add an antivirus exclusion rule for the Steam installation directory..

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

I need help
05Run CHKDSK tool to verify and repair filesystem errors on the drive.

Run CHKDSK tool to verify and repair filesystem errors on the drive..

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

I need help

Possible causes

  • Active antivirus or Windows Defender blocking Steam from modifying game directory files.
  • Corrupted files or bad sectors on the target SSD/HDD.
  • Steam directory folder permissions reset to Read-Only.
  • Corrupt download cache file transactions inside the steamapps/downloading folder.