RK07and RL0x pre-checkout

I have not yet found an operating manual for the RK07's in the group of stuff I got. I want to check them out and think I recall that they can be powered up and maybe heads loaded while not attached to the host. True? If so, anything I should know? What to look for if anything not correct? Also, the previous owner left packs *in* two of the drives :( . One probably is an all-important boot disk for the 1/34A as he told me he had booted it up the day before I picked them up. Well, I'm not too happy with this as there may be a risk that the disk got damaged during moving and transport. I can take the black sheet metal cover off the drives and check that the heads are retracted. How do I get the disk out as the disk cover seems to be locked? Will powering up and a certain keypress unlock the disk cover without the heads moving onto the platter? I'll need to do the same to the RL01's and RL02's to sort through them as to functionality. Thanks yet again for the help. Regards, Chris -- --