I had a HR23-700 whose internal hard drive went bad & I had it replaced with a HR24-200. Well,because Directv never asked for the box or access card to be returned,it's been sitting at my house all this time. Recently I "broke the seal" to see what kind of hard drive it needed,& had that hard drive on my do do list. Well I finally ordered & received the hard drive & put it into the HR23. I plugged it in to test it & it booted up,did an internal test,formatted the hard drive,& went all the way to "refresh HD DVR( or whatever exactly it says)." Now all I need to reactivate it to my account(if Directv let's me) is to install a SWM-16 multi-switch(because I already have 8 tuners) & then call to have it activated. Will follow up & let you know what happens.