disk not readable message El Capitan/Canon camera - how to fix?

If your OS X 10.11 upgrade (from an earlier Mac OS X version such as OS X 10.10 or less) is giving trouble that your previous version did not experience, check with your Canon camera support to see if it and the software you are using is compatible with El Capitan. Your camera's firmware or software may require updating for El Cap compatibility. If Canon updates are not available, you will need to wait for them or revert to your older but working Mac OS X version.

If you really updated from one El Cap 10.11.x version to a later one, you may simply need to use OS X Recovery to completely reinstall Mac OS from the Recovery System stored on your startup drive.

If you need more help, when you post back, tell us which Canon camera and software, if any, you use as well as which Mac OS version number you updated to and from. We will try to offer more specific suggestions based on the details in your response.

Message was edited by: EZ Jim

Mac OSX 10.11.4

YW, Peter.

nicsman wrote:...I'm on OS 10.11.3 ...

There is a newer El Capitan.

Restart your Mac. Then either downloadn and install OS X El Capitan 10.11.4 Combo Updateor simply use OS X Recovery to completely reinstall your Mac OS from the Recovery System stored on your startup drive to get the latest version.

nicsman wrote:... (EOS 6D - a first foray into full-size sensor)....

WOW! Nice. Enjoy.

Message was edited by: EZ Jim

Mac OSX 10.11.4

The solution to upgrade camera software is odd, since the Mac cannot see the camera at all. Through what device would I execute such an upgrade, or access to the internet for such an upgrade, if the Mac can't see it?

Mine is similar issue... My Panasonic DMC-S27 point/shoot camera has always worked (connected to Mac and downloaded to Photos just like with older Mac iPhoto versions) ... it worked in older iMac (since replaced), with new one, and in several Mac operating system upgrades. El Capitan comes along, and POOF... the camera does not connect via USB and does not even appear in the profiler.

The good news is there's an SD slot in the iMac, and the card works fine. But it's suprising. It's been several years since I needed an external SD card reader, and I thought those days were gone with USB cameras and other external USB devices. Maybe not!!

What are chances Apple will recognize this and fix it? Seems not that hard to do.

Chewrag wrote:...What are chances Apple will recognize this and fix it? ...

Just FYI, Chewrag.

¶ 2.1 of Apple Support Communities Use Agreement prohibit us from speculation or discussions like your question.

Message was edited by: EZ Jim

Mac OSX 10.11.4

nicsman wrote:... my camera formatted SD cards still pull up that same message. There's some disconnect in the file formatting ...

(1) Have you checked with Canon to see if it is a known issue for which they might be working on an update?

(2) Have you tried a Mac formatted card in the camera to see if the camera will write reliably to it and whether your Mac can read those files?

(3) If your SD card is high capacity, you may find some help in one of these:

    Error code -36 - HELP!!!

   About the SD and SDXC card slot - Apple Support

Message was edited by: EZ Jim

Mac OSX 10.11.4

nicsman wrote:...It still seeks to gobble the pix for Photos which I don't want to happen so I'll have to stick with ....

Your issue may be fixable if your Canon and your Mac OS X versions are compatible.

With compatible software, your camera connected, and Photos open, you can disable the Photos gobble as shown here:

If desired, quit Photos and launch your Mac's "Image Capture" app to select what action occurs when you connect your camera as shown here:

Message was edited by: EZ Jim

Mac OSX 10.11.4

YW, Peter.

Happy I could help.

Message was edited by: EZ Jim

Mac OSX 10.11.4