[blue68f100]

A std 4500 comes with a SCSI card for tape backup. The 4500 use a software RAID, 2 different controller chips. Most only see 1 chip. If you use a linux based OS it will see all of the hardware. There are only a few overrides that needs to be done. If I recall some one installed FreeNAS on a 4500. But if it was me I would stick with the GOS it a very proven OS.

Use the search feature and see if you can locate the threads that cover these OS Swap. But if you ever want to go back to the GOS you will need to save a working HD with the OS.