Long time user, first time poster~

[PsychicBaconPrds]

Hi everyone, first off, thanks for reading this. I can use the help! Let's dig in:

I have a 60D. Today, I realized ML had a firmware update (coinciding with my new 64GB SD), so I figured I'd just get everything ready to go for a shoot I've got this weekend.

I didn't have anything on my cards, so I fresh installed everything (starting with the 1.1.1 FW from Canon to the 2.3 ML update) on my C10 16GB SDHC. Went without a hitch.

Then I turned my focus to the 64GB card... "Update file cannot be found. Please check the memory card and reload the battery"...

Huh?

I did everything the EXACT same as the 16GB card, and can't for the life of me figured out why it's not working properly. I've triple checked I've copied over the correct FW, formatted the card in-camera and on my Mac, and still it's no-go.

The 16GB card works flawlessly, so it's not as if I don't know how to install it.

Any ideas, guys and gals?

EDIT -- Ooh, you know what? I'm assuming SDXC cards are the problem. Am I right?

[Led]

Hi, you should only need to update your camera firmware once. It stays in the camera, so once it's done you shouldn't need to do it again.
Is your 64 gb card dslr bootable?
How are you making it bootable?
I format in the camera, then use Macboot program on my Mac to make the card DSLR bootable, then copy the ML files over to the card.
You are copying all the files? You don't need some of them but safest to copy them all if you're unsure.
You definitely have the autoexec file on your card?

[PsychicBaconPrds]

Okay --

I downloaded MacBoot (and the Mountain Lion script addendum), checked off "Make DSLR Bootable" - said everything went smoothly and the card was prepared.

Unzipped ML directly into root folder, and then pop the card into my 60D. Now, instead of booting and simply not recognizing ML, the LED on the SD Card door is just flashing incessantly and the camera won't boot up at all.

I copied all the files over this time, just to be 100% certain something didn't get missed.

[Led]

Hi, maybe it is an SDXC issue? I don't have my camera here so can't check, but I run a 64gb card without a problem, but I don't know from memory if it is HC or XC. I'll have a look later when I get home but hopefully someone else will have an idea before then..
The blinking led without booting usually means you have the wrong firmware version, but I don't know if that's the case here.
Have you checked you have the right version of the Canon firmware in your camera?

[PsychicBaconPrds]

Sounds good. I can't for the life of me figure out why the heck it's not working. The 16GB is working perfectly, which is driving me nuts!

Let me know about your 64GB when you get home. Maybe the 60D/ML combo hates SDXC.

[a1ex]

Canon bug, it's documented in the install guide.

[Led]

I had a look at my 64g card, but I can't tell what it is because the label got ripped off it by some sticky tape.
Woops..

[PsychicBaconPrds]

Canon bug, it's documented in the install guide.

How did I miss that? Now I feel sheepish.

Bleh. I guess I'll pick up an SDHC today. Drats~