DDC Fixed Head Disks

Hi, I just received a DDC (Digital Development Corporation) 6200X series fixed head disk. It includes all of the cables, power supplies and controller for a PDP-11. Before I hook it up to one of my 11's, does anyone have any docs on this beast? Here are the specs as I know them: Series: 6200X Speed: 3450rpm bits per track: 72000 access time: 8.7ms tracks: 64 unformatted capacity (MB): 0.58 Supposedly there was no scheduled preventive maintenance, however DDC made other fixed head drives that were helium filled and they needed periodic service. So, my question is do I need to do anything (like purge and refill) before I use it? Does anyone have any additional info? I did get some manuals with it, but they're mostly focused on the controller for the PDP-11. TIA. -- TTFN - Guy