The primary reason you cannot copy files from a Mac to a pen drive is that the drive is likely formatted in NTFS, which is a Microsoft Windows file system. By default, macOS can read files from an NTFS drive, but it cannot write or copy files to it.
Here is how you can identify and fix this issue using standard macOS tools or third-party workarounds. Step 1: Verify the Drive Format
Before changing anything, double-check your pen drive’s current file system. Insert the pen drive into your Mac.
Right-click (or Control-click) the drive icon on your desktop or in the Finder sidebar. Select Get Info.
Look at the Format line. If it says NTFS, this is why your Mac is blocking transfers. Step 2: Choose Your Solution
Depending on whether you can afford to wipe the drive, select one of the following methods: Solution A: Format the Drive (Free & Permanent Fix) Fix MacBook USB Drive Can’t Copy To
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