I have a MacPro4,1 (MacPro early 2009). I posted here on Oct. 29, 3 PM. After installing Mvrx, the WiebeTech eSATA card driver was disabled and moved to Incompatible Software folder. WiebeTech support said to just reinstall the software in Mvrx.
ALL the data on my external backup drives (both firewire and eSata connected) were wiped over the next day after installing Mvrx:
G-RAID 8TB - eSATA
G-RAID 6TB - fw800
WD MyBook 6TB - eSATA
NewerTech dock with 3TB HGST drive - fw800
WD Passport 2TB - USB3 (partition lost but NO data on it) connected to USB2
After the were wiped, I pulled eSATA card and just used fw800. I began rebuilding the drive thinking it was an eSATA driver problem. I have a SSD internal boot drive + 3 internal HGST 4TB drives. I then lost 1 of the HGST 4TB drives and paniced at that point. I had NO TM backups because they were on 2 external 6TB drives.
I called Apple and opened a support case. The decision was to backup and restore my system using a CCC backup I'd made and shutdown the MacPro. I used my Mac Mini with Mtn Lion to make a copy of the SSD with Mvrx for later diagnosis and then restored back to Mtn Lion. I spent the next several days restoring the internal drive from a Drobo 5N backup and recreating the lost data which were backups of the 3 internal HDs.
In hindsight I'd tried and failed to uninstall and remove the WD utilities on my MacPro in frustration because of pop up windows that the WD Util generated. With Mtn Lion, the spotlight search failed to locate the program since it hides system folders. I had installed a new version months ago and for some reason there were 2 versions installed and both ran whenever the WD MyBook was connected via fw800. I ran MyBook using eSATA so the WD Util software would not run. I finally found where WD utils were located via the info on this discussion and it is now removed from both Mtn Lion computers and confirmed that using "Find Any File" app.
Important Warning for Mtn Lion users running the WD utilities:
Three months ago the MyBook 6TB drive was corrupted under Mtn Lion in the same way (blank MyBook partition with EFI). At the same time the G-RAID 8TB controller failed and was replaced under warranty. I thought the failiure of the MyBook 6TB was due to that controller glitching some how since both were on the eSATA card). I reformatted the MyBook 6TB and rebuilt it but was using it with the eSATA PCIe card. It worked well after that. The MyBook does have an issue of disconnecting for some reason or not being recognized on rebooting. Recyling power on it generally allows it to mount.