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Windows 7: Disappearing internal HDD when eSATA dock used

05 Apr 2014   #1

Windows 7 Ultimate x64
Disappearing internal HDD when eSATA dock used

Here goes. A year ago or so I built a new machine for a friend. The mobo is a Z77A-GD65, a CM 690 II advanced case with the integrated eSATA dock, a 256GB Samsung 830 SSD as the C drive and a Caviar black as the D drive. The dock was connected to SATA4 with hot plug enabled and used extensively with no issues. A few days ago the computer was dropped off with a 500GB 840 Evo to replace the 830. This is the only hardware change. I installed Win7 x64 with zero issues and sent the computer back. I did update the BIOS and ran into a bad flash but was able to recover ok. Version 10.11 is on the A BIOS with 10.5 on the B. So my friend calls me up and says the external dock is giving him issues. When he plugs in a HDD, the internal Caviar black disappears. A scan for hardware changes brings it back (most times) but it shouldn't be disappearing. If the computer is booted cold with a drive in the dock everything is good until physically removed and reattached. When booted cold and attached, I can safely hotswap the drive. As long as I don't physically remove it, I can then scan for hardware changes and it comes back every time like it should. If I physically remove it after safely disconnecting and reattaching, the D drive vanishes every time. The pagefile is also on D. This has me completely baffled. I moved the internal connector to SATA6 and SATA8 on the AsMedia controller (enabling hot plug as I did so) with the same issues. I booted to the backup 10.5 BIOS and have all the same issues as described above. As I said, this has me completely stumped and is not something I've ever seen and God knows I've built dozens of machines and installed Win7 probably hundreds of times. Any ideas? TIA.

My System SpecsSystem Spec
06 Apr 2014   #2

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1

To eliminate any BIOS related issues I would first do a ClearCMOS procedure with only the SSD attached. After successful ClearCMOS I would add back the HDD and check for correct drive letter, reboot and then try the dock.

If that was unsuccessful I would then try DriveCleanup, a program recommended by one of our members here. You can find a link to it in this thread:
Drive G: intermittently disappears

Let's see if either of those help.
My System SpecsSystem Spec

 Disappearing internal HDD when eSATA dock used

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