Hi, Many thanks for response - even if it doesn't really address the problem, it at least gives some input into a diagnostic process. I, too, did a clean Windows 8.1 install on Z77 Professional BUT I did the clean install linked to Microsoft account and it seems to me now - given your feedback - that my problems may be tied to Microsoft Account-linked Windows Updates which are incorporating system settings changes from the system that share the account: a) Asus N750JV laptop (i7-4700HQ; 16GB RAM; 256GB Samsung 850PRO SSD; 1TB WD Red HDD) b) Desktop: Asrock X99X Killer; i7-5820K; 32GB RAM; 512GB 850PRO; 9 x HDD; 2 x ODD c) Desktop: Asrock Z77 Professional; i7-3770; 16GB RAM; 512GB 850PRO; 6 x HDD; 2 x ODD The laptop is running Windows 10 Professional 64-bit and the two desktop systems are both running Windows 8.1 Professional 64-bit (both from clean installs). The laptop is fine, and the X99X Killer desktop with 9 x HDD; 1 x SSD and 2 x ODD is also behaving as it should (with only external USB-connected devices showing on the "Safely Remove" list. I hear you about "keeping current settings" but this seems to me a bit like a "let's duck the issue" approach. The alternative of using Intel SATA ports doesn't quite work either as the system is configured with 10 x SATA devices: 6 x Seagate ST3000DM001 3TB hard drives 1 x Western Digital Red 2.5" 1TB hard drive 2 x Optical drives (DVD and BD writers) 1 x Samsung 850PRO SSD The Z77 Professional comes with 6 x Intel SATA ports and 4 x Asmedia SATA ports. Currently the port:drive allocation is as follows: Intel port 0: SSD Intel port 1: 2.5" 1TB WD Red Intel port 2: 3.5" 3TB drive Intel port 3: 3.5" 3TB drive Intel port 4: DVD/RW drive Intel port 5: BD/RW drive Asmedia port 0: 3.5" 3TB drive ("A") Asmedia port 1: 3.5" 3TB drive ("B") Asmedia port 2: 3.5" 3TB drive ("B") Asmedia port 3: 3.5" 3TB drive ("C") The chassis is a Lian-Li PC-Z60 and all six of the 3.5" drive bays are "hot-swap" bays BUT THE BIOS SETTINGS FOR THESE DRIVES ARE ALL SET AS "INTERNAL" (i.e. NOT "Hot-Swap". These last four 3TB drives (A/B/C/D) are the drives that come up on the "Safely Remove" list and they're all connected to the Asmedia SATA6G controller (which is not drive-level configurable in the BIOS). I suppose it would be possible to change the drive:port assignment (via cable switching) so that the four drives currently giving the problem would be attached to the Intel ports and the remaining drives attached to the Asmedia controller. This would permit checking to see if the problem went away or remained a problem - with some additional info to be gained from how the problem remained (i.e. stayed with the port or moved with the drive). I may have misunderstood, but it seems to me from what I've read, that the BIOS settings and registry entries that govern this "Safe Removal" list operate at a "PORT-LEVEL" and NOT at a "DRIVE-LEVEL"? I'm just wondering if the problem could be linked to the Windows Registry and specific registry entries that govern "Safe Removal Required" settings where these settings could have been modified via one or more Windows Updates? Puzzled... Dave
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