external hard drive now read only after el capitan update

After updating to El Capitan yesterday, my toshiba external hard drive is now only giving me permission to "read only". How do I fix this? I have wedding photos I need to be able to access to edit!

MacBook Pro, OS X El Capitan (10.11)

Posted on Oct 4, 2015 12:28 PM

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90 replies

Dec 15, 2015 6:57 PM in response to Clavdia_C

Clavdia_C wrote:


I see your point, but the drive was mysteriously marked "read only" after upgrading to El Capitan. I tried many solutions including terminal work, etc. And then I downloaded the software. And then it worked.

Then either it is NTFS or you have some other software causing problems. Hard drives do not need any additional software. If they do, something is wrong.

Dec 15, 2015 7:15 PM in response to Barney-15E

What software could cause this problem? I know for sure how my drives are formatted. I'm sure you know what you're talking about but I've had so many issues with Apple/Mac products in the last couple years that I wouldn't be surprised if some kind of bug was causing my drive to be read in a way it shouldn't be read. I've had a "Remote Disk" in my Finder through the last four OS iterations that won't go away despite reading 300 forums and trying as many solutions.


I noticed today after updating my software that my bootable partition, which has been formatting and working fine for--as I said--years, wasn't showing up in my finder. I checked Disk Utility and it was mounted. I checked Info. It was marked "read and write" but a sentence said "you can only read." I spent an hour trying to figure this out. I started in Safe Mode a couple times. I could not unmount the drive. First Aid did nothing. I couldn't click on anything in the read/write area to make changes. (And yes of course I unlocked it.)


Then I downloaded the Paragon software and it worked. Maybe it's magic. Maybe it's coincidence. Maybe someone else can be spared wasting three hours of her life on yet another sloppy software bug.


ETA: It's not just me. Here's another person with the OS Extended issue. I haven't used a Windows product since 2007 and the drives were not changed in any way. This issue just happened with a recent upgrade and not the original El Capitan.

Dec 15, 2015 7:14 PM in response to Clavdia_C

I've got a half dozen drives connected to my Mac. None went Read only, wouldn't mount, or any other problem when I upgraded to El Capitan. Some were Seagate consumer drives, others were Seagate drives in third-party enclosures. Some USB2, most FW800. No additional software required. No bugs in the OS.


If Seagate is now shipping drives that require some third-party software to work, that's pretty sad.

Dec 17, 2015 8:33 AM in response to J Sim

I bought a new Mac with OS X El Capitan and my Samsung portable hard drive - which worked fine with the old computer - both with Mavericks and El Capitan now wouldn't show up. I tried everything, terminal didn't recognise anything and disc utility was the same. After a huge amount of research, uploading the latest Seagate software I finally changed to cable, using the much longer cable from my Nikon camera. Now the drive works just fine! So it seems that the cable is compromising the drive perhaps because it isn't long enough?

Dec 18, 2015 7:51 PM in response to Lacey Baker

OK let me start with this. I'm not a one into all the technical jargon and detail fixes, and I'm not sure who these Level 1 and Level 8 people are.


What i can say is I bought a MAC a year ago to work on my photos and I've been using my MAC along with Lightroom and Photoshop extensively for a year. Never had any issue. Until i upgraded to El Capitan.


After upgrading to El Capitan all 3 of my external HD's are now read only. The only variable that changed was El Capitan.


I am hoping somebody at Apple can fix this **** issue like yesterday. Thank god i do not have a client not where i need to edit images. *** is going on? Never had this issue with Windows and am not looking at going back when I need another computer . . . I'll leave that for another discussion.


All i want to know is how to fix this. I'm hoping there is a patch, etc that is out there now or soon that somebody can say.


Like I said, not looking for any complicated fixes and work arounds. I'm hoping our developers can put something together that an average user can follow and fix this issue.

Dec 27, 2015 1:09 PM in response to MRB1230

All i want to know is how to fix this. I'm hoping there is a patch, etc that is out there now or soon that somebody can say.

Select one of the Drives and Get Info in Finder. Look at the top of the info window and see what it says under Format.

If it is NTFS the reason you can't write is because OS X has never had the capability to write to a Windows hard drive.

When you bought the drive, the manufacturer formatted it for Windows and gave you some software to install to make it writable. Unfortunately, you installed that software and it no longer works because the manufacturer didn't update it for El Capitan.


You can either format the drives with the native OS X file system which will require that you move your data, then restore it after formatting, or you contact the manufacturer and get an update to the software which you will likely have to update at every OS update or upgrade.


If it is formatted Mac OS Extended, then what does it show in the Sharing section of Get Info.

Dec 29, 2015 1:47 PM in response to Barney-15E

sorry ur answer isn't absolute correct, if that is case you shouldn't able read either. it seems like you guys want create ecosystem and blame others for your problems. quite similar to other problems in the upgrade. If the answer is correct you shouldn't able read the drive either and open the content correctly.


Opening it read-only mode makes me think the driver worked to reading the file. Except you guys want to support only native stuff if that is case just say it, we will find ways to get around it rather blaming other vendors

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external hard drive now read only after el capitan update

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