I would bet you a shiny new nickel that there's absolutely nothing special about the drive, so if it's broken I'm sure you could replace it with...

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My drive is special insofar as it still works perfectly. If you do a little research on the GCC HyperDrive mechanisms you will find they became notorious for their failure rates. So the fact that the one I have is still alive after all these years is telling. Sure it could be a fluke, but to know that I wanted to research more about the drive itself, not simply the "category" of compatible drives. But as you too found out, MMI dropped off the face of the planet without a trace. And all that's left of them is this unique, fully functional "ST-506 compatible" drive.