Clearing the download cache of Steam will force the Steam client to flush locally cached configuration data and acquire it from the Steam server again.Navigate to your Steam - Clear Download Cache Reinstalling Steam may fix potential issues with Steam client and service files while preserving all installed games.Then right click your Steam launch icon and click "Run as administrator". Type these commands one by one and press Enter key after each: You may now close Command Prompt, repeat the downloading/upgrading process and check if the Steam disk write error Windows 10 disappeared. Scroll to the bottom of the log file, and look for a "failed to write" error, which will list the file name & path of the issue.
At the disk map area, select the partition that has Steam installed and choose "Check File System" from the Check Partition group. In the new emerging window, select "Check & fix detected errors" and click Start button. If any error is found, Partition Wizard will try its best to fix it.
Luckily, Mini Tool Partition Wizard Free is also capable of doing this work.
At the disk map error, select the hard drive which has Steam installed and choose "Copy Disk" from the left action panel.
Please restart Steam and then repeat the downloading/upgrading.
If the Steam disk write error persists, restart your computer then.