I have 5 internal drives and 1 esata drive and 1 usb drive. I can boot to 3 different drives including the Esata drive. The ESATA drive and the USB drive are identical. When I reboot the computer intermittently when the 5th internal hard drive is listed the computer will not start and next to it, it says SMART error. I restart and it starts fine. Then, after restart, I get a message in the right hand lower corner that my usb device has failed and could not be recognized. So I turn the usb device off and on and my hard drive (identical to the ESATA drive) pops up fine. I checked all my disks with Hard Disk Sentinel. They are all in excellent health, 100%. The USB disk however has 1206 errors communication errors. There are no recommendations, just a possible problem with the cable. I swapped out cables for both the ESATA and the USB disk. I still get the same errors on start up. (I did used to boot up from the ESATA disk and if I push f12 and choose it, I can still directly boot onto that disk if that matters). I get the same communication error testing with HD Tune Pro 5, (NO error with the ESATA). And I have done every single test with Seagate and WD Lifeguard. 100% health and no bad sectors and BOTH drives pass the SMART tests. What is going on???? I just feel like these drives are both fine. I am booting into Windows 8.1 64 bit operating system. Thanks