The gooey rubber that’s slowly ruining old hard drives (opens in new tab)

As part of my work toward an upcoming post about a lost piece of very obscure Mac history that has finally been found, I’ve been playing around with old Apple-branded SCSI hard drives made by Quantum and Conner in the 1990s. What I’m about to describe is already common knowledge in the vintage computing world, but I thought it would be fun to share my take on it anyway.