Hi all.

I have the following.

Asus P9X79 MB (Manual here http:// )

it has two SATA 3 ports, I have my C (system) SSD in one and my D (program) SSD in the other

It has 4 SATA 2 ports, I have another older SSD in one (couple of mmos on it), my DVD drive in the other, and the other two taken by a SATA expansion bracket (rarely used, but handy when needed)

I have my E drive, a 2TB SATA 3 disk containing my music software and my documents etc
I have my F drive, a 2TB SATA 3 disk containing my videos and numerous other misc stuff.

Both of these are plugged into:

Highpoint Rocket 620 (R620) 2 channel Internal PCI-e v2 x1 to SATA 6Gb/s non-RAID controller card (Marvel 88Se91xx Adapter)

A few weeks ago I used my cases front USB to copy my music from my F drive, and my F drive had disappeared

Usually when I boot the PC, the first thing I get is the Highpoint Bios telling me it's found my two HDDs, but after this, it was only showing one.

To get my F drive back, I have to shut down and pull the power

This happened a few times, sometimes it happened was soon as I use the front case USB, sometimes it would happen an hour or so later (always F drive, never E)

I upgraded my USB 3 drivers from Asus a few days ago and updating these (without plugging anything in) , also caused my F drive to instantly disappear..

So I had a play around.

The cases USB port was plugged into the MB USB 7/8 (USB 2) and I moved this to MB USB 13/14 (also USB 2)

The Highpoint card was plugged into the PCIEXE16_3 port and I moved this to the PCIEX1_2 port

Have just copied some photos from my tablet and I got the sound like a USB device has been unplugged, and yet again my F drive has disappeared.

This is beginning to get tiresome

Any suggestions please?

Have tried the latest two released and the latest beta MB BIOS, same thing happens.

My complete PC Spec inc everything permanently plugged into it

Windows 8.1 64 Pro with media center

4GB Nvidia GeForce GTX 670

Highpoint Rocket 620 (R620) 2 channel Internal PCI-e v2 x1 to SATA 6Gb/s non-RAID controller card (Marvel 88Se91xx Adapter)

Corsair Force GT SSD 120GB (SATA 3) (C Drive)
Corsair Neutron GTX SSD 240GB (SATA 3) (D drive)
Corsair Force GT SSD 60GB (SATA 2) (Older H drive)

Toshiba SATA 3 2TB (E drive and very small G partition for emails)
Seegate SATA 3 2TB (F drive)


Intel Core i7 3820 a2011 Overclocked to 4676 MHz
Asus P9X79 Socket 2011 ATX Motherboard
32GB Corsair Vengance DDR3 RAM

Compro Videomate S350 Sat TV card (PCI)

Tagan TG700-U25 700W ATX2.0 Dual Engine Silent sli Power Supply

Raza Naga MMO Gaming Mouse
Logitech G510 Keyboard
Logitech G13 Gaming Pad

Asus Vulcan Pro ROG Headset

Ilok 2 Dongle
Steinberg eLicenser dongle

Dell U2713HM monitor running at 2560 x 1440
HannsG HW191D monitor running at 1440 x 900

Archon SB-E X2 CPU Cooler
Antec 1200 Case

MB Sound disabled
MB Serial port disabled
MB USB ports 7/8, 9/10, 11/12 now also disabled (did this when I moved things around to try and fix problem)