More info on this. The Hpt controller obviously messes up the partitioning of drives you attach to it. A Vista64 bootable HDD got modified so that it would not be recognized by EFI or OS X.
I connected it up again with the RR2642 and booted it from there with some difficulties because I have to remove all other bootable media before the Mac Pro finds the device. I then called up Vista disk utility and it installed some drivers again. Then I shut down the Mac from Vista and transferred the HDD to a proper HDD sled. It got recognized again.
One 250 GB HDD is probably lost. It was partitioned while on the RR26412. Neither a Windows BIOS machine nor the Mac Pro can partition the drive any more.
I think the controller has set the HDD to be a SCSI drive and the EFI or BIOS controller cannot read those.
I'm totally fed up with Highpoint.
It sounds like it blew the LBA0 (Protected MBR0). You could try a Low Level Format for the drive (be sure it supports the manufacturer and capacity).
This is what I was trying to get at in the previous thread. Something's going on, and it's likely a combination of the LBA0 is getting damaged by Highpoint's firmware, and when it was successfull (partitioned on the logic board), the offsets were different I think, and the pointers where dead ends (stalled boot).
As per Highpoint, I don't like their products in general, and have had problems myself in the past. It was bad enough that I've never bought anything from them in over 10 years. And it was over a FakeRAID controllers as well.

I don't trust FakeRAID at all anymore, and am willing to spend the money on a proper hardware RAID card, even for situations other options supposedly exist. It's saved me headaches/massive aggravation as a result, and my sanity is worth it.

Hence the recommendation to go ahead and get the ARC-1210 for the SSD's, assuming Areca gives a PASS on the SSD drives you've got on hand.
As it happens, members here are having success with the RR43xx SAS RAID cards (proper hardware RAID controller btw), which coincedentally, are designed and manufactured by Areca, which I've had really good success with through the years. To the point I swear by them at this point. If I get burned, that could change though.
Sorry it's been such a nightmare.
