The backup copy starts up on firewire in OS X with no problems... but doesn't startup in OS 9.
This is probably also a hardware limitation, with OS 9 and my Mac.
here's apple technote relating to hard drives- it's hard to find unless you know it exists. the other info about startup and workarounds is scattered in different places (such as peripheral vendor support pages, etc.)
http://docs.info.apple.com/article.html?artnum=86178
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Michigan Medical Marijuana Dispensaries