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I didn't notice your line of code above - per your suggested wiki reading I downloaded UBCD v531 - ran HDAT2 - removed HPA - set to full capacity...
When you ask if I'm using a USB adapter - I hooked up the wd drive to direct sata cable but I do have an add on Anker USB 3.0 PCI-E card in my pc....
P55-UD6:/$ sudo hdparm -N /dev/sdb
max sectors = 7814028911/7814037168, HPA is enabled
I am trying to set up a WD40eurx on a Roamio Plus
I have followed Telemark's instructions but get stuck at this point
Target Drive /dev/sdb...