I have a new Dell Precision 5550 laptop (which is basically a beefed-up XPS 15) running Windows 10. I'm trying to connect my Pegasus1 R4 to one of the thunderbolt 3 ports. Because the Pegasus R4 uses thunderbolt 1, I'm using an adapter to go from the R4's thunderbolt 1 cable to the thunderbolt 3 port in my laptop. Regardless of whether I use an Apple or StarTech.com thunderbolt 1/2 to thunderbolt 3 adapter, the Pegasus R4 refuses to show up. The Pegasus R4 is the *only* device I can't get to work on this new computer. I tested both thunderbolt adapters with numerous other thunderbolt 1 and 2 peripherals - an external hard drive, a thunderbolt dock, even a different RAID array by OWC - and all of these work just fine on my new Dell laptop using either adapter. Just not the Pegasus R4, which is the one thing I need to work.
I've tried loading every Windows driver version that Promise ever made for any Pegasus running on Windows. I've tried using different thunderbolt cables. I've tried booting the laptop with the Pegasus R4 already on and connected and tried connecting after the laptop has booted into Windows 10. Nothing seems to help. The R4 never shows up in the Device Manager or Disk Management utilities. It also never shows up under the Thunderbolt Control Center software on the laptop. I even backed up all my data, wiped the drives, reformatted them as NTFS, and that also did nothing. It's as if the R4 doesn't even exist. I also tested the Pegasus R4 on a new Dell XPS 13 and see the same problem there - the R4 just won't show up.
The Pegasus R4 is in perfect working condition, and I had put in all new disks about a year ago, so it's painful to watch that investment just disappear. I asked Promise about buying a different Pegasus2/3/32 R4 enclosure, but they won't sell me an enclosure without disks.
Until now I've been using the Pegasus R4 on a MacBook Pro with Mojave and with Windows 7 via Bootcamp. It works perfectly in both environments.
Any ideas would be massively appreciated.