Western Digital 10c52x4 model commonly is known as being made up.
Seagate Rosewood Models – more in depth than the blog post here. With pictures of the way you have to take it apart and how it is different from other drives. Pictures of a closeup of the sliders or whatever is different, etc. Pictures of PC-3k during firmware repair. Video showing the process to open up the port for firmware work and maybe a super common firmware issue fix?