I did the same a week or so ago, I thought my external drive was going to leap off the table, I never thought it was the discs, so I stuck the discs in again today, and !I've just spent part of this morning going over this reported issue.
I have 2 players that can play DVD's:
A Sony X800M2
And a Cambridge Audio Azur 752BD
There is a slight hum when the DVD's are played in either player, with the Marantz AVR on mute.
I tried various other DVD's with no issue in playback.
I would never have known about this, as when the music is played, I cannot hear the hum.
I do not think my problem is anything like what is being reported and as it hasn't affected my enjoyment, I will keep this copy.
I hope everybody else gets their issue sorted promptly.
PS: Once I've ripped the DVD's, the physical discs will join the ever-increasing library!! And gather dust for all eternity.
Update: I've just ripped the DVD in my PC's DVD player and what a racket!! I thought it was going to break the PC!!
This copy is going back....grrr