The moment I saw this thread, I immediately thought of Kiss.
AC/DC are Bronies

Ringo's "Ringo the 4th" from 1977Don't think it even charted

Grateful Dead, Shakedown Street. Easily their worst studio album, pre-1980.

Chicago recorded a "disco" album. I think it was "Chicago 13".
I was going to mention Chicago. I watched the documentary that aired on CNN at the beginning of the year, and they played a clip of "Street Player".
You are correct in saying it is Chicago 13 that was their disco album.
Joker's Wilde

Buddy Burger. Have us scrape one off the grill..so YOU don't have to scrape one off the road!

Not a rock group, but ABBA's "Arrival" album is the same. Only one disco song on the album (Dancing Queen) yet it is considered to be a disco album. Weird. I even saw Wikipedia call "Money, Money, Money" a "disco" song, even though it is a whiter-than-white theatrical-like song that is impossible to dance to.
I once saw an album by John Paul Young listed on a record database website as being "disco". I listened to the album, and there's not a single disco song on it.
New Du Mont high-resolution picture tube and high picture power give a fuller tone range

Blondie-Parallel Lines

The guys from Chic refer to themselves as a rock band, but
C'est Chic
is one of the most brilliant disco albums ever, maybe.

The Bee Gees
See what I did there? They werent really a rock band and they never really recorded a disco album, but
Maybe Bowie somewhere in his career?

Ignorance and prejudice and fear walk hand in hand

I always considered Emotional Rescue to be their disco album.

The Stones -
Some Girls
The whole damn place goes crazy twice and it's once for the devil and once for Christ