[gijoe77]

Hello and welcome!

as for hardrives, for my indigo2 I stuck this drive https://www.ebay.com/itm/HP-412751-016-3...2877971743 into it with the assistance of a 50pin to 80pin SCA adapter https://www.ebay.com/itm/SCSI-SCA-80-PIN...2227557176

as for cddrives for installs, there are very neat network install tools that users in this forum have worked on (in no particular order):
-there is DINA for Netinstall - https://forums.irix.cc/thread-316.html
-there is irixboot - https://forums.irix.cc/thread-642.html
-there is irix-install docker - https://hub.docker.com/r/dexter1/irix-install/