Panasonic DMR-EH55 Ram Drive Problem

Do you mean you want to replace the hard drive in the unit? If so, I have one of these units and I installed a new PATA hard drive and then "prepared" it with a firmware update that is available from Panasonic's website. I tried to increase the capacity by installing a 500GB hard drive, and also a 300GB hard drive, but no matter what size I put in, after I initialized the new hard drive with the firmware disc I always only had 92 hours available to me. In fact there was never anything wrong with my unit, I was only trying to increase the capacity for recording - which I was never able to do. I did find that another 200GB hard drive I tried didn't actually work for some unknown reason, but the 500GB, the original 200GB and a 300GB hard drive worked no problem every time I swapped them around. Let me know if you need the link to Panasonic's download - it's easy to find.