Since I updated my MacBookPro to Sequoia 15.4
1- my usb portable drives have become locked on read only and it is impossible to change to read and write. The disk utility app says they cannot be fixed.
2- .dng's images (raw from iPhones have turned black on the computer screen
MacBook Pro 16″, macOS 15.4
Then I would recommend running DriveDx (free trial period) as suggest by some of the others to check the health of that drive. Post the complete DriveDx text report here using the "Additional Text" icon which looks like a piece of paper on the forum editing toolbar. You will need to install a special USB driver in order to access the health information on the external drive. Even new drives can be bad.
I know a couple of people have reported resolving recent external drive issues by connecting the drive to a USB3 hub instead of connecting the drive directly to the computer. I would also recommend disconnecting all other external devices while troubleshooting just in case one of them is causing a problem.
Also make sure to try using a different high quality USB-C USB3/4 cable (or Thunderbolt 3/4) cable from a well respected manufacturer. Many people resolve external drive issues by using higher quality cables from respected manufacturers. Same thing goes if you need to use any adapters. The cables supplied by the drive manufacturers are usually of poor quality.
And of course try each other USB-C port on the Mac.
This is the error I get when I unmount the disk and attempt to erase and format as APFS:
This the error I get when I attempt to use First Aid:
I can run both operations without issue in Recovery Mode but as soon as boot back into the OS the disk is read only.
Yep, Teri be format for ir Mac backup.
you need new NTFS DRIVER.
I also had a call with Apple Support and they walked me through quite a few steps and could not resolve the issue.
A correction to my first screen cap. That was taken when I first purchased the drive this screen capture is after I formatted to APFS. Read only.
Yeah, I was thinking the update may have broken any NFTS SW they had.
My drive is formatted in APFS according to my revised screen capture and it’s still read only. Has been APFS for at least a year and a half.
Yes, I did. I erased the whole drive and not just the volume. That's the error I get when I attempt.
Sequoia 15.4 update made usb drives read only
