How to Make Files Read-Only When Copying to a Disk or USB Drive
Question details
The user needs to ensure files remain read-only and cannot be edited or deleted after being copied to an external disk or USB drive.
- Product
- File System
- Device & OS
- not provided
- Scenario
- Copying documents or files to a removable disk or USB drive to share them securely without allowing modifications.
- Observed behavior
- Files marked as read-only in local properties sometimes lose this protection or can still be modified after being copied to the destination disk.
Ensure your external disk or USB drive is formatted to support advanced file permissions (such as NTFS for Windows or APFS for macOS), as older formats like FAT32 may not retain read-only attributes properly across different devices.
Set Read-Only Attributes and Adjust Disk Permissions in Windows
Use Windows File Explorer to enforce read-only properties directly on the target disk to prevent unwanted edits.
Simply checking the 'Read-only' box on your local computer might not carry over to the destination disk. To ensure files cannot be altered, apply the read-only attribute directly on the file after it has been moved to the disk, and adjust the security permissions if you are using an NTFS-formatted drive.
Copy the desired files and paste them onto your external disk or USB drive.
Right-click the copied file on the external disk and select 'Properties' from the context menu.
Under the 'General' tab, check the box next to 'Read-only' at the bottom of the window, then click 'Apply' and 'OK'.
If your drive is NTFS-formatted, go to the 'Security' tab in Properties, click 'Edit', select the 'Everyone' user group, and check the 'Deny' box next to 'Write'. Click 'OK' to save.
Apply Document-Level Password Protection
Restrict editing natively within the document itself before copying it to the disk, ensuring protection regardless of the disk format.
Secure Your Files with Built-in Read-Only Protection in WPS Office
Instead of relying on unpredictable disk permissions, use WPS Office to easily restrict editing and format your documents as password-protected read-only files before sharing them on external drives.
- 1. Open your file: Launch WPS Office and open the document you want to make read-only.
- 2. Go to the Protect tab: Navigate to the 'Protect' tab located on the top ribbon menu.
- 3. Enable editing restrictions: Click on 'Restrict Editing' and check the box to restrict the document to 'Read-Only' mode.
- 4. Set a secure password: Enter a restriction password and click 'OK' to apply the protection to the file.
- 5. Save to your disk: Save the document and copy it to your external disk; it will remain read-only on any computer.
Frequently Asked Questions
Why do my read-only files become editable after copying to a USB drive?
This usually happens if the USB drive is formatted as FAT32, which does not support advanced file permissions like NTFS or APFS. Additionally, copying a file creates a new instance of it, which may automatically inherit the default (editable) permissions of the destination folder.
Can someone easily remove the read-only attribute I set in Windows?
Yes. The basic read-only attribute in Windows File Explorer is not a strict security feature. Any user with access to the file can right-click it, go to Properties, and uncheck the read-only box. For true security, you must use document-level password protection.
Is there a hardware switch to make a whole disk read-only?
Yes. Some SD cards and specific secure USB flash drives feature a physical write-protect switch on the side. Sliding this switch will lock the entire drive at the hardware level, making all files on it read-only and preventing any new files from being added or existing ones from being deleted.
How do I make a PDF read-only before putting it on a disk?
You can use a PDF editor like WPS Office to set a permission password. Open the PDF, go to the Protect or Security settings, choose to restrict editing and printing, enter a secure password, and save the document before transferring it to the disk.
