Steam Disk Read Error means Steam could not read game files when launching or verifying a game. Unlike write errors (which occur during downloads), read errors typically point to corrupted game files, drive sector damage, or file permission issues.
What causes Steam Disk Read Error?
When Steam tries to launch a game or verify integrity, it reads each file and checks it against its hash. If a file is corrupt, missing, or on a bad disk sector, the read fails. Disk read errors are more indicative of drive health issues than write errors, which are often software-related.
Corrupted game files
Corrupted or partially-written game files from a previous interrupted download are the most common software cause. Verifying game file integrity through Steam (Library > right-click game > Properties > Local Files > Verify integrity) re-downloads only the corrupt files.
Drive health
Bad sectors on HDDs or TLC/QLC SSD cells in a failing state cannot reliably read data. If disk read errors occur across multiple games on the same drive, check drive health with chkdsk and S.M.A.R.T. data.
How to fix step by step
- 1Right-click the game in Steam Library > Properties > Local Files > Verify Integrity of Game Files.
- 2Run chkdsk on the Steam drive: Admin command prompt > chkdsk D: /f /r.
- 3Check drive health with CrystalDiskInfo or your drive manufacturer's tool.
- 4Move the game to a different drive if the current drive has repeated errors.
- 5Reinstall the game if verification does not fix the corruption.
- 6Run Steam as administrator to ensure it has read permissions.
- 7Check the game folder permissions: ensure your user account has Read access.
How DISK-READ-ERROR differs from related codes
- Error DISK-WRITE-ERROR: Steam cannot write game files to your hard drive or SSD. The write operation failed, stopping the download or update. (user-side)
- Error 105: Steam could not reach its servers — often during maintenance, DNS issues, or firewall blocks. (server or client)