I just installed a second Pegasus 32 R4 to my 2017 iMac. It's daisy chained to my original Pegasus 3 R4 which is 5 years old. When I shut the iMac down, the drives appear to shut down, but the new Pegasus continues to hum (fan?).
I went to the instructions to try to reset the fan settiings, but couldn't find a solution there. (Looked at Spin down HDD, but the option to set a time was grayed out and couldn't be reset).
Any advice? My original drive doesn't keep running like that. Seems like a problem.