Matt,
This is a big point about troubleshooting an Amiga, its frequent crashes could be a weak PSU, failing capacitor, eroded track, or one of the multitude of patches made to the flippin' OS! Or a tampered with HDD.
As far as the infected HDD firmware goes, this was another (NSA/TSA/Homeland/Fatherland Security Act) large scale effort that now uncovered, will lead to the Snowden Effect of people finding way to make sure they are not having their privacy invaded (which we used to have with a Constitution, or a Bill of Rights, and a few Amendments to protect us) until along came someone who felt that his own security was superior to anyone else's in America or even on this planet.
The drive companies will have to act and MAKE firmware safe, secure, and uncorruptible or face the backlash of us finding a company that will do this; a company that sell the drives that can not be infected.