Home > Questions

USB Switched Suddenly to Read-only Mode on Mac, What to Do?

My Mac is almost full and I have to use a FAT32 USB stick for storing files. I tried to access my USB but it's in read-only mode and I don't know why. I've copied across the most important stuff on it and prepared to reformat it, yet when I try to erase the drive in Disk Utility, it won't let me do that. In Get Info, it says my USB was created in 1980. What should I do?

Best Answered by

iBoysoft author Connie Yang

Connie Yang

Answered on Monday, February 19, 2024

You can use Disk Utility First Aid to check and repair the USB drive first. If First Aid finds no issues, your USB drive may experience more serious problems.

Follow the tricks below to fix your USB drive that is read-only on Mac.

Check the connection

Maybe you've accidentally touched the USB port, interfering with the normal communication between your Mac and the USB. You can eject the USB and then reconnect it to your Mac to verify that.

Check your permission to the USB

Right-click the USB and select Get Info, then scroll down to the Sharing & Permissions section to check your privilege to the USB. If it is Read-only, change it to Read & Write.

Reformat the USB on a Windows computer

Although FAT32 is compatible with Windows and macOS, formatting a disk to the same FAT32 on Windows and macOS also has slight differences. These differences just make the USB read-only on your Mac.

You can reformat the USB on a Windows PC and then check if it returns to read-write on your Mac.

People Also Ask

Read More Questions

Read More Advice From iBoysoft's Computer Experts

read write ntfs on macos sonoma

NTFS para Mac Sonoma: Leer/Grabar en una unidad NTFS en macOS Sonoma

Esta publicación tiene como objetivo guiarte para leer y escribir en una unidad NTFS en macOS Sonoma. Responde si el último macOS Sonoma admite NTFS y cómo obtener un soporte completo de lectura y escritura de NTFS en macOS Sonoma.

Système de fichiers en lecture seule sur Mac

Réparer le système de fichiers en lecture seule sur Mac (Terminal/Disques externes)

Vous rencontrez l'erreur de 'système de fichiers en lecture seule' sur Mac? Voici comment modifier le système de fichiers en lecture seule dans le Terminal et sur votre disque dur externe Mac.

Astuces NTFS pour Mac

Read and write Boot Camp partition on Mac

How to Mount BOOTCAMP NTFS Partition with Read-Write Access?

Tutorial to mount BOOTCAMP partition in read-write access and write to BOOTCAMP partition using command line or with NTFS for Mac software in macOS and Mac OS X.

NTFS for Mac Tips