Usually when it says disk write error mean disk write error, go check your storage with sentinel / crystaldiskmark
You using bootled oem refurbished Adata?

Does this problem only happen in Steam? How much free space is left on that drive? Is the drive u're using internal or external? If u use external, does the drive ever disconnect, go to sleep, or randomly disappear? Have u already restarted ur PC since this error first happened?

In the exact path of u Steam Library shown in Steam Settings, does it say "missing"? Are the games that fail to install or update located in the same library folder as the games that still work normally?

Also, how is ur SSD's health? Yuou can check it using CrystalDiskInfo and tell me the Health Status and the SSD temperature.

Knowing these might help troubleshoot your problem and find out what's causing it.

run chkdsk on the drive

use disk check utilities for smart errors
any bad or pending sectors = replace the drive asap

引用自 Rhys：

I have been having this issue when I have to download a game and the steam says "disk write error" and wont let me download any games. I have also had he problem where steam says my steam library folder on the SSD is not there and my games are gone, when i have all my games downloaded. I am sort of new to steam and am 14. Please only post helpful things.

A Disk Write Error in Steam usually means Steam can’t write files to the drive you’re installing a game on. This can be caused by drive permissions, corruption, bad sectors, antivirus blocks, or the drive being in read-only mode.

Here’s a clean step-by-step checklist to fix it:

✅ 1. Basic Quick Fixes
Restart Steam

Close Steam completely (exit from system tray) and reopen it.

Restart Your PC

Simple but often fixes locked files.

✅ 2. Check Drive Health
Run CHKDSK

If the problem is only on one drive, run a disk check:

Run Command Prompt (CMD) as admin, then type and execute:

chkdsk X: /f /r


Replace X: with the problematic drive's letter.

This checks for bad sectors and repairs file system errors.

If CHKDSK finds many bad sectors, that drive may be failing.

✅ 3. Clear Steam Download Cache

Steam → Settings → Downloads → Clear Download Cache

This fixes many corrupt-file errors.

✅ 4. Verify Game Folder Permissions

Steam may not have write access to the library folder.

Go to the drive’s Steam library folder (example):

X:\SteamLibrary\steamapps\

Right-click → Properties → Security

Make sure your Windows account has:

Read

Write

Modify

If not, click Edit → enable Modify and Write.

✅ 5. Run Steam as Administrator

Right-click Steam → Run as administrator

This solves permission-related write errors.

✅ 6. Remove Read-Only From the Folder

Right-click the Steam library folder

Properties

Uncheck Read-only

Apply to all subfolders/files

✅ 7. Disable Antivirus / Controlled Folder Access

Security software sometimes blocks writes.

If using Windows Defender:

Settings → Virus & threat protection → Ransomware protection
→ Manage Controlled folder access → turn it Off, or allow Steam through.

If using 3rd-party antivirus:

Temporarily disable it and try again.

✅ 8. Check Drive Free Space

Make sure the drive isn’t full or nearly full. Steam also needs extra free space for unpacking.

✅ 9. Move the Steam Library Folder

If the drive’s Steam folder is corrupted:

Steam → Settings → Storage → Add Drive

Add a new folder on another part of the drive or another drive and try installing the game there.

✅ 10. Delete Corrupt Game Files

Sometimes a partially downloaded game causes the error.

Go to:

X:\SteamLibrary\steamapps\downloading\

Delete the folder with the game ID (for the game you're installing).

Try downloading again.