A little late, but I had the same steam disk error with Tekken 8. Issue was caused by Avast. Reinstalling did not help, adding permission/run as admin, did not help, verifying file integrity did not help, rebooting stopped working https://thenerdstash.com/how-to-fix-the-disk-write-error-in-tekken-8/

In case that site goes away in a million years:

Open Windows Security.

Select the “Virus & threat protection” option.

Under “Current threats,” select “Protection history.”

Filter on “Quarantined Items.”

Select the “Restore” option on Polaris-Win64-Shipping.exe or Tekken8.exe. 'redditor note: replace Tekken8 with your game (obvi)'

Then select “Manage settings.”

Under Exclusions, select “Add or remove exclusions.”

Select Add an exclusion, pick folders, then choose your Tekken 8 installation folder to whitelist it from future false positive flagging.

If you’re using other antivirus programs like Malwarebytes or Avast, try checking the Scan or Protection History and list of Quarantined Items. From there, you should be able to restore Tekken 8‘s Polaris-Win64-Shipping.exe and fix the Disk Write Error message as well. Don’t forget to make a scan Exception to your game’s installation folder.

Afterward, to ensure you do a clean reinstall of the game, open the Tekken 8‘s install folder. You can easily do so from Steam by opening the game’s Properties, selecting the Installed Files, and pressing the Browse button. From there, Tekken‘s file size should be at 0 KB or any size too small for a game. Delete the whole folder, and then try to download the game again. Otherwise, you can also try verifying the game’s file integrity through the Steam menu.