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Of the 2 I have, one had a cracked hard drive disk and had sheared the read head off... the other had issues with the read head as well...

Cracked? Sheared? What on earth are you doing to them??

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Another thing I'm wondering is will there ever be a Hijack for Karma?

Nope. Never. The Karma doesn't run Linux and the player is a massive monolithic binary combined with the OS. It runs an old version of eCos with the non GPL license from what I remember. I think there is some sort of protection against you trying to run your own firmware as well.