The problem is both OWC's & Apples!
From The SSD Review
- "The OWC Aura contains two SMI 2246 XT 4-channel controllers which are situated in a RAID configuration through a Marvell 9230 RAID controller. There are four unbranded 256MB MLC synchronous NAND flash chips which, once paired, create a RAID 0 volume with a 1TB capacity."
Basically, they tried to maximize the performance on what chips they where using. I personally think this is more an Apple mess up than OWC's.
OWC could have posted something to at least acknowledge the issue or contacted you if you gave them your email address. All we got was a MacRumors posting with no follow up. Or, info on where to look for news.
The Apple piece is the current release of APFS does not support RAID drives!
So what to do?? Sorry to say you'll need to wait a bit more until Apple fixes APFS to support RAID on the boot drive and if needed OWC to update their onboard firmware and/or device driver.
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FYI from MacRumors: OWC's Aura SSDs Not Working With macOS High Sierra, Fix Coming Soon
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0
I spent hours installing the old apple drive - installing HighSierra and then trying to update the Aura SSD (1Tb). I then spent an hour on text support with OWC. The answer is that the Aura SSD WILL NOT WORK with HighSierra. They have a rebate program where they want to sell you the Aura Pro X - which will work but they will only give a $300 rebate after you have purchased the Auro Pro X. I have been an OWC customer for years and this is a pretty bad way to treat customers. The old Apple SSD (flash) works fine but the Aura SSD will not suport High Sierra because of the need to have APFS. Somehow they have frigged the internals on the drive to some proprietary system and HighSierra is a no go.
crwdns2934271:0crwdnd2934271:0 Martin McAdam crwdne2934271:0
Well I've got good news! OWC has fixed there firmware issue with High Sierra: AURA SSD FIRMWARE UPDATE (BETA)
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0