This article was published in 2020 and updated in October 2026.

You try to save a file, install a program or delete something from your SSD, and Windows refuses with a message that the disk is write-protected or read-only. Your data is still readable, but you can’t change anything. This guide explains the common causes and how to fix an SSD that is stuck in read-only mode in Windows 11 and 10 (the steps also work in older versions).

First: back up your data

Before you try any fix, copy your important files from the SSD to another drive or a cloud service while you can still read them. Some SSDs switch to read-only mode on purpose when they are close to failing — in that case, the data on it may soon become inaccessible.

Step 1: Check the drive’s health

SSDs can only be written a limited number of times. When the flash memory is worn out, or the controller detects serious errors, many SSDs lock themselves into read-only mode to protect your data. Check the drive’s health with the manufacturer’s tool (for example Samsung Magician, Crucial Storage Executive or WD Dashboard) or the free CrystalDiskInfo. In Windows 11 you can also find an estimate of the remaining life under Settings → System → Storage → Advanced storage settings → Disks & volumes → Properties. If the health status is poor or the tool reports the drive as worn out, copy your data and replace the SSD — software fixes won’t help.

The manufacturer’s tool also shows whether a firmware update is available; updates sometimes fix bugs that cause unexpected read-only behaviour.

Step 2: Clear the read-only attribute with DiskPart

Windows can mark a disk or volume as read-only. You can remove this flag with the built-in DiskPart tool. Be careful: selecting the wrong disk can lead to data loss.

1. Right-click the Start button and choose Terminal (Admin) or Command Prompt (Admin).
2. Type diskpart and press Enter.
3. Type list disk and note the number of your SSD (check the size).
4. Type select disk N, replacing N with that number.
5. Type attributes disk clear readonly.
6. If a single partition is read-only, also run list volume, select volume N and attributes volume clear readonly.
7. Type exit and restart the computer.

Step 3: Check the registry setting

A registry value can enforce write protection for storage devices. Only change it if it exists:

1. Press Windows + R, type regedit and press Enter.
2. Go to Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies.
3. If you find a value called WriteProtect, double-click it and change the value data from 1 to 0.
4. Restart the computer.

If the StorageDevicePolicies key doesn’t exist, this isn’t the cause — don’t create it.

Step 4: Check the file system with CHKDSK

File system errors can also cause read-only behaviour. Open Terminal or Command Prompt as administrator and run chkdsk X: /f, replacing X with the drive letter of your SSD. For the system drive (usually C:), Windows schedules the check for the next restart. CHKDSK can repair the file system, but on a failing drive it can also put extra strain on it — so make sure your backup is complete first.

Step 5: Format the SSD (last resort)

If the file system is badly corrupted, formatting the partition can make the SSD writable again. Formatting deletes all data on the partition, so only do this after backing up. You can format in File Explorer (right-click the drive → Format) or with Disk Management; third-party tools such as MiniTool Partition Wizard offer additional options. If the drive goes back to read-only mode after formatting, it is very likely failing and should be replaced. More background is available in MiniTool’s article on SSD read-only errors.

Summary

Whether it’s a Samsung, Crucial, Kingston, WD or any other SSD, read-only mode is either a software flag that you can clear or a warning sign that the drive is wearing out. Back up first, check the drive’s health, then work through the fixes above — and if the SSD is failing, replace it before it stops working completely.

More guides

• How to Check SSD Health and Remaining Lifespan
• How to Make Your Hard Drive or SSD Last Longer
• 10 Ways to Speed Up Your Windows Computer
• How to Check Your Laptop Battery Health from the Command Line