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External Hard Drive became Read Only

After updating to macOS Sierra on Macbook Pro (Retina 13", Early 2015), my Toshiba External Hard Drive became Read Only.


Had to update NTFS from here: https://www.tuxera.com/ntfs-drives-and-macos-sierra/ and Restart. Working fine now.

MacBook Pro with Retina display, macOS Sierra (10.12)

Posted on Oct 16, 2016 10:47 PM

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Posted on Mar 12, 2017 7:41 PM

I have also updated to Mac Sierra (previously Lion) and my external WD was connected to the Mac when updated. Now it shows up but said it has RAID errors and all my photos are not showing up on that drive. Is it fixable? How do I fix it? am not really techy. please help.

9 replies

Aug 22, 2017 5:28 PM in response to marcthomas77

marcthomas77 wrote:


I have a Toshiba Canvio 1TB and all I needed was to download this Tuxera NTFS for Mac OS X El Capitan or Sierra and it's now working perfectly. http://support.toshiba.com/support/viewContentDetail?contentId=4008404

I think that was established a year ago when this thread was original started. My post above remains as my advice to you.

Oct 17, 2016 5:51 PM in response to hkumeria

That is because your external hard drive is formatted NTFS for Windows computers and you were running a third party utility with your old operating system that allowed your Mac to use the Windows formatted drive


When you upgraded your operating system to Sierra you failed to also update the third party utility. Now that you have done so it is working. Unless you have a need to use that external disk on a Windows computer you should copy off the data and format it for your Mac computer, thereby eliminating the need for the third party utility work-around.

External Hard Drive became Read Only

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