Pegaus2 R4 has been functioning normally after upgrading firmware to 5.04.0000.64 on older iMac then connecting to my new Mac Studio M1 Ultra running OS Ventura 13.2.1. It is set up as a RAID5 drive which has not been changed since purchase with 4x 3TB Toshiba drives installed by Promise. I have Promise Utlity 4.06.0000.04 loaded onto the Mac for management.
After transferring desired files to the Mac Studio internal SSD, I performed a full initialization with Promise Utility to clear all data intending to use it for Time Machine back-up. After restarting my Mac, a warning pop-up appeared which presented an option to "initialize", which I did NOT perform again with Disk Utility. Pegasus does not mount and Disk Utility says it is "uninitialized". What steps must be performed for the Mac to mount it and retain the current logical drive? Why would an initialization with Promise Utility render it unreadable and mountable?