I've been diddling around with my scratch disks in After Effects and Premiere Pro lately, trying to come up with the best solution that works for me.
I'm running a 13-inch MBP retina, in which I'm usually editing on the go with. I've been carrying around an external drive for use as my scratch disks, but it's become annoying to have it plugged in 100% of the time I'm editing (planes, hotels, etc).
I bought a Transcend Jetdrive Lite the other day, and thought it might be a good way to have a removable storage device for my scratch disks. However, after I plugged it in and reformatted it to journaled, After Effects gave me the message that I couldn't use it as a scratch disk because it was classified as "removable media."
Is there any way to change it so that the mac sees it as permanent media?
If at all, I would imagine that this involves some pretty obscure terminal commands to create a persistent mount point and classify the respective device drivers as permanently loaded. You'll have much better luck asking on some very nerdy Mac forums about this stuff...