I've tried using dual hard drives on my Mac IIsi (Apple 40 MB and 80 MB). I switched the 2 port SCSI ribbon cable with a 3 port cable and used a power splitter to provide 2 power ports for HDs. When I boot the IIsi with both drives, however, it gives me the "Startup Disk Not Found" flashing question mark. The cables and splitter are fine, they work with only on HD installed. Maybe the problem is both HDs set to SCSI ID 0, but I don't see ID jumpers anywhere on the drives. Is there some kind of built-in limitation on the IIsi preventing dual HDs (like when it was switched to 20MHz to prevent cutting into IIci sales?)
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