I get the error "Unable to change to Apple TV mode"

Can anyone help ?

When I try to install the application on my usb drive , it copies the files to the drive (which takes several minutes) and then I get the error

"Unable to change to Apple TV mode. Unmount failed "

any ideas im easger to use this app !!!

macbook pro 17"
kensington usb stick 1 gb


What version of Mac OSX are you using? It may be due to an incompatible flash.


thanks for the reply Im using

Mac 10.5.4 (leopard)

not sure if its the memory stick thats the problem ??


Yes, it may be related to the flash drive brand.

Take a look at:


Receive also an error during the change Apple TV mode. This one has to do with being unable to add gpt.

This is what I see in the console:

[diskutil, unmountDisk, /dev/disk3]
Disk /dev/disk3 unmounted
return code = 0
[gpt, add, -b, 0, -s, 0, -i, 1, -t, 5265636F-7665-11AA-AA11-00306543ECAC, /dev/disk3]
return code = 1
java.lang.Exception: gpt add failed
at ATVFlash.changeToAppleTvMode(ATVFlash.java:692)
at ATVFlash.access$800(ATVFlash.java:7)
at ATVFlash$16.run(ATVFlash.java:627)
at java.lang.Thread.run(Thread.java:613)

Anybody an idea if this is also related to the flash drive? Seems not logical to me as it is able to unmount it. Permission problem?

Any help/suggestions is highly appreciated.