BackdoorArts
Senior Member
As a slight aside, I only turn my camera off if I think it may get activated when I'm travelling and it's in a bag. From my D70, D300, D800 and D7100 I leave it on as it reduces wear on the switch (probably silly to worry about that) and it is always ready to shoot, although I know a DSLR boots virtually instantly. I've left them on for months in the past and it barely touches the battery.
I've always read that the camera should be off when you remove the card and swap lenses or it may not read correctly.
One caution, if you do swap lenses with the camera on, make sure to turn VR off before removing the lens or you can damage it.
I'm with the others regarding getting a 10 rated card. Until then, make sure the 6 is your primary as it will write faster.