The error being reported in the event log is Event 129 Reset to device, \Device\RaidPort2, was issued.
I am receiving this error regularly. It is important to note that is not my boot drive. I boot from an SSD (Samsung 830). I use a pair of 1TB WD Caviar Blacks set up in Windows as a RAID mirror.
The problem only occurs when I am not actively using the computer. The effect depends on whether or not I use sleep mode (set for 2 hours). If I am not using sleep mode, the partitions will periodically “disappear” from computer management as if the drives are not part of the computer. Rebooting solves the problem. The disks need to resync.
Under sleep mode, I will see the logs during which time the computer is sleeping. Bringing the computer out of sleep seems to restore things to a normal state.
Chkdsk did not reveal any issues with the disks. The disks report as healthy.
Bios reports SSDs are set to AHCI. It does not show the WD’s on this screen, but they do appear elsewhere in the BIOS.
Windows 8 Pro 64 Bit.
Asus P9X79 Pro
Corsair 64GB (CMZ64GX3M8A1600C9 kit)
Samsung 830 256GB Sata 3 (boot drive)
Samsung 830 512GB Sata 3 (currently unpartitioned)
2 Western Digital 1TB Cavier Black (WD1002FAEX) set as RAID 1 by Windows (contains 3 partitions storing data)
HT Omega eClaro (connects to component system, but I keep it turned off)
EVGA GeForce GTX 650 SC 2GB
Lite-On BR Burner (HSB112-04)
LG BR Burner (WH14NS40)
Corsair H80 Water Cooling kit
3 Dell U2412M monitors
Wacom ET-0405A-U Tablet (use as mouse)
Seasonic X750 Gold
Synology DS211J NAS
Since I made the original post, I did the following
1. Updated the BIOS to version 3203
2. Installed the Intel Chipset V930102 Windows 9 12-11-12 update
3. Installed the ASmedia SATA Controller Driver V1.3.4
4. Installed ASUS PC Diagnostics V1.2.3
5. I tried installing the Marvel MSU Utility V188.8.131.523 software from the ASUS site. It installed fine, but I just got a whole bunch more errors so I rolled it back.
Here are how the drives are connected to the motherboard
SSD Samsung 830 256GB
Top - Intel X79 Serial ATA 6.0 gb/s (7 pin Sata6G_1/2[gray])
SSD Samsung 830 512GB
Bottom - Intel X79 Serial ATA 6.0 gb/s (7 pin Sata6G_1/2[gray])
Top - Marvell serial ATA 6.0 Gb/s connectors (7-pin SATA6G_E1/E2 [gray])
Bottom - Marvell serial ATA 6.0 Gb/s connectors (7-pin SATA6G_E1/E2 [gray])