New MacBook Air only detecting 19 iPads when hooked up to cart with 32 iPads in it.

This seems to be an issue related to the new 2013 MacBook Air models. I've seen it pop up a few times now, and the common factor is always a 2013 MacBook Air.

A "solution" doesn't seem to exist yet. The workaround at this point would be to either use any older Mac to do the syncing, or only connect and sync half of the devices at a time.

I performed a variety of hardware changes and tests to check this as i had exactly the same problem. Had a lengthy chat with Apple UK and credit where credit is due, they provided a solution.

I had been working with an independent Apple Consultant as well and i provided him with the solution. Rather than type it in again here, he eloquently put the solution onto his website. For any sufferers of this issue, please try out the following guide:

http://theictadvisors.co.uk/mac-book-air-sync-issues/

I even got Apple Support to give me the return command line, in case it did not work.

However, i was warned by Apple support, when plugged into the sync trolley as more power is being allocated to the USB ports, this will have a greater pull on the battery. So, do what you gotta do and then unhook. 🙂

Hope this helps.

Remember, i accept no responsibility if this does not work, just worked for me!!

Seems that the new MacMini 1,4 Ghz also has this limit.