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Zelf posted a topic in Compact MacHi 69kmla community! Having some trouble figuring out how to format and initialise an external SCSI HDD (GCC Technologies UltraDrive 45) with Apple HD SC setup 2.0.3 on a Macintosh Plus from 1986 with 4MB of RAM. I read elsewhere that i need HD SC setup version 3.0 to recognise non-Apple SCSI external HDD to boot on it the system. And that 3.0 version work with System 7.0. I have System 6.0.8 on a DD Floppy Disk. The external 45MB HDD use 50pins connector with a passive SCSI terminator. The lights blinks when Mac Plus boot up and trying to find System files and also when trying to search for SCSI drives with Apple HD SC Setup but never recognised. So i need an DD 720k disk with HD SC Setup and another one with System 7 to start formatting this non apple hdd? Thank you, restoring this gift.