I am trying to figure out a compatible lens for my Canon EOS 60D. A Tamron lens is my preferred option as I used to have one for my old Minolta when I used 35mm film. The motor in my EOS 60D is a USM. I believe I need a USD Tamron lens, but I am unsure. I see HLD Tamron lens on the market that make reference to APS-C format but I am unsure if this is compatible with my EOS 60D. Advice is welcome.
There is no autofocus motor in the 60D, the autofocus motor is always in the lenses.
Your 60D works with lenses designed for the EF or EF-S mounts(*), and lens that work on the 60D will always state this. The EF-S is specific to APS-C cameras, the EF mount is for full-frame or APS-C cameras. Keep in mind that on a 60D (APS-C) the field of view of the lens is reduced compared to what it provided on a film/fullframe camera, this make it appear at a longer focal length, so a "standard" 50mm lens on a APS-C makes it look like a short 80mm tele, and the "standard" focal length on APS is therefore around 35mm.
(*) There are two other mounts types for Canon lenses: EF-M and RF. These will only work on mirrorless cameras.