i am now on the hunt for 10 sector disks for a northstar horizon. a few years back I purchased a bunch and they were stolen... I thought that my northstar had been stolen, but *happy dance* in the process of moving from one storage unit to another, what did I find... my horizon :) no media for it remains :( and the manuals are gone, don't remember if the thief that broke into my storage P*ssed on them or is they were taken at the time also.