How to fix external SSD read-only in macOS High Sierra?

Posted by Katrina to NTFS for Mac on March 6th, 2018

It's really confusing that external SSD shows read-only when we insert it in macOS High Sierra. Actually, read-only external SSD happens frequently after upgrading to macOS High Sierra. But don't feel panicked! It is possibly because our external SSD is formatted to NTFS for Windows computers. (We can go to the "Get Info" section to have a check).

By default, macOS High Sierra natively enables NTFS read support, but disables NTFS write support. Thus, we can only view files but can't copy delete or save files from macOS to a NTFS drive. Since external SSD is useful when it can be read and written, it's necessary to fix read-only external SSD in macOS High Sierra. The following are three solutions to fix it:

Solution 1: Reformat NTFS external SSD to FAT32 or exFAT on Mac

FAT32 and exFAT are two universal file systems that can work with both Mac and Windows. FAT32 doesn't support file larger than 4GB and partition size larger than 2TB. While exFAT has no limitation on file size or partition size. So choose these two according to our actual situations.

Tips: Before reformatting NTFS external SSD to FAT32 or exFAT on Mac, to avoid important data loss, we should make a backup copy of files on the external SSD elsewhere.

We can use the method below to reformat NTFS external SSD to FAT32 or exFAT on Mac:

Step 1: Launch Disk Utility.

Step 2: Select the external SSD on the left part of the window.

Step 3: Click the Erase on the top of the window.

Step 4: Complete related information, including name, format (MS-DOS refers to FAT32), scheme, and then click Erase button.

Solution 2: Mount external SSD in macOS High Sierra with command line

Notice: The command line is not as easy as we think and it's very possible to input wrong command, so we should use it with caution.

Step 1: Go to the Applications > Utilities folder and launch the Terminal program.

Step 2: Input "sudo nano /etc/fstab" to edit the fstab file (supply your password when prompted).

Step 3: Type "LABEL=NAME none ntfs rw,auto,nobrowse" in the editor window for the fstab file. (Be sure to replace the word NAME with the name of our external SSD)

Step 4: Press "Control+O" to save the file, followed by "Control+X" to exit.

Step 5: Unmount our external SSD and attach it again.

Solution 3: Install professional NTFS driver to write to external SSD in macOS High Sierra

Installing professional NTFS driver to write to external SSD is an easier and more reliable method. Here recommend two professional NTFS for Mac software: NTFS Assistant and iBoysoft Drive Manger Free.

1. NTFS Assistant: the cheapest NTFS for Mac utility in App Store

NTFS Assistant is a professional NTFS driver that can easily help write to NTFS drive on macOS 10.13 High Sierra. NTFS Assistant is not only the cheapest NTFS for macOS software in App Store, but also has very stable performance.

Guidance to download and write to NTFS external SSD with NTFS Assistant

Step 1: Download and install NTFS Assistant from App Store >>.

Step 2: Download and install NTFS Assistant Helper >>.

Step 3: Launch NTFS Assistant and connect a NTFS external SSD to Mac.

2. iBoysoft Drive Manager: mount NTFS drive, external drive and network drive

iBoysoft Drive Manager is a handy Mac tool that can mount NTFS drive on Mac as a regular drive with read-write mode. It supports macOS Mojave 10.14/High Sierra 10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8/10.7.

iBoysoft Drive Manager

Aside from above, iBoysoft Drive Manager can also help mount and unmount network drives and external drives. Only a simple click from the menu bar, we can mount and unmount external hard drive, USB flash drive, SD card, memory card, CF card, pen drive, network drive, etc.

Write to NTFS external SSD in macOS High Sierra

Tutorial to mount NTFS external SSD In macOS High Sierra with iBoysoft Drive Manager

Step 1: Launch iBoysoft Drive Manager and connect NTFS drive to Mac.

Step 2: After getting notification that the NTFS external SSD has been successfully mounted, we can write to the drive.

Still have questions?