How much power does the BR-20's USB port provide?
I used to hear the same thing about BDP-1's USB ports which were also underpowered, yet I could make ALL my WD My Passports (1TB, 2TB, and 4TB) variants over the years work with no issues off any port and even multiple at the same time.
Does the light up sequence remain the same when plugged into the BR-20 vs. a computer? If the light stays on and becomes stable, it should be fine. I just wouldn't rule it out immediately that it's because of power issues...unless BR-20 has less power than BDP-1?