Just started using a 64-GB e-series p2 card. I transfer via firewire directly from the camera, so I generally don't need to remove the card from the camera slot. Is it OK to just leave it there, or should it be taken out when not in use?
I cannot see why that would ever be a problem. Normally problems happen when reconnecting but I don't think that is even a problem on these cards because they are so directed on insertion there is not much of a chance of getting it wrong.
I say keep them in if you like, hard to misplace them if they never come out of the camera.
I have two P2 Cards, I only take them out to offload through my Dual-adapter. After using them I put them back into the camera, and close the hatch for safe keeping. 'Been doing this for over a year and never have had any problems.