Did the 9865 work after you replaced the iHDD? The Purple model seems to be specifically designed for surveillance applications. Until you mentioned it, I hadn't heard of this model.
Most people have utilized the WD Black, Red or Blue drives. Certainly not the Green drive which seems to be incompatible with PVRs. If the problems started after you replaced the drive, perhaps you could try putting the old drive back as a test? Check all your connections inside the box, etc. Here's a thread on replacing the drive. Check out the instructions and posts there:
The 9865 often requires more signal than the 8642, so the fact that the 8642 works doesn't necessarily mean there's enough signal for the 9865. You may wish to check the signal yourself using the link I provided previously.
As I mentioned same issue persist with old and new drive installed. I chose purple drive just because a lot of writing/erasing and reliability.
So, this "Er:51" Error 51 came out of nowhere with original Seagate 1Tb drive a few months ago and it persist with a replacement WD purple drive. Replacing the drive is pretty straight forward with secure torx bits use and some dozen screws to take off and screw them back on. It's not the hard drive issue.
I understand that the 9865 is more signal sensitive PVR but still can't go any further boot and error 51.
I looked around at a few forums and found the following directions which may help. Not sure which of these will work best in your case. Nothing to lose I guess:
Make sure your remote is in cable mode, press pause on the remote and hold it until you see an envelope flashing on the stb display,when you see the envelope press page- ,then press list 3 times. PVR should reboot and format hdd. You may need to turn the box off to start the format, or not. Instructions have varied.
1. On Rogers remote, hold PAUSE until the mail icon is flashing. 2. Once it's on, release PAUSE, press LIST, PGDN, PGDN, PGDN 3. Display will say hdd3, and will reboot.