Windows 10 upgrade failure - multiple drives

Computer Type: PC/Desktop
System Manufacturer/Model Number: Badrobot Junk Systems, Inc.
OS: Win 10 Pro x64
CPU: Intel i7-4790K
Motherboard: ASRock Z97 Extreme6
Memory: Corsair Vengeance Pro Series 16GB (2x8GB) 2400Mhz
Graphics Card: ASUS ROG Strix GeForce® GTX 1070
Sound Card: Purity Sound 2 (On-board)
Monitor(s) Displays: 1xLG 34" ; 1xAcer 24"
Screen Resolution: 1x3440x1440 ; 1x1920x1080
Keyboard: Armaggedon MKA-5R RGB Hornet Mech KB
Mouse: Logitech Hyperion Fury G402
PSU: EVGA G1 750 Watts 80 Plus Gold Certified Full Modular
Case: Deepcool Genome (Game Storm)
Cooling: Deepcool Classic Captain Liquid Pump, 360 Radiator w/ Double Helix Reservoir
Hard Drives: Boot Drive: 256GB Samsung M.2 PCIe SSD (2100MBps-R, 1200MBps-W) Data & Test Drives: 240GB Samsung 840 SSD, 2x120GB Samsung Evo SSD,
Internet Speed: 60MBps
Browser: Google Chrome
Antivirus: Windows Defender
Other Info: -Cisco DPC3825 Docsis 3.0 Wireless Gateway -ASUS RT-N65-U Dual Band Gigabit Router -Linksys N900 Dual Band Gigabit Router (Access Point) -4xTP-Link Gigabit Powerline adapters (1 w/ wireless) -Qnap TS-220 NAS -HP Win 7 x64, Acer Win 8.1 x64 HTPC, ASUS Win 8.1 x32 10" tablet, Nokia Lumia 1520 Denim, Raspberry Pi Model B, Raspberry Pi 2