Hi,
Neemobeer is right on the money here. Since we don't know your hardware environment, Desktop PC, Laptop, or self-built PC, and what kind of BIOS it has (UEFI or non-UEFI), there are many variables to be considering in the BIOS settings that can affect a W7-->W10 upgrade. Generally speaking it's
NEVER considered a good idea to attempt a Windows upgrade with any secondary hard drives plugged into the computer; either
SATA, USB, eSATA, etc. Those should always be disconnected so that the Windows install tool (
MCT:
Media
Creation
Tool) does not become confused by having multiple hard drives to choose from to install the new OS (W10) on.
Unplugging any and all secondary drives from your computer prior to attempting the W7-->W10 upgrade will provide the MCT tool with only one place to install the W10 files: the C: bootdrive. In your case, the SSD drive. Then once W10 has been upgraded and is properly working on your computer, then begin added your secondary drives and other peripheral devices, one at a time, until you get them all working.
I've done this upgrade on my Sony laptop to both a mechanical hard drive as the bootdrive, and then again on separate occasion to my Kingston SSD drive. Both times, it worked perfectly!

Plugging in any external devices, such as secondary drives, usb printers, usb cameras, usb touchpads, etc.
BEFORE the upgrade just shows that you have never done an Windows OS upgrade before, as this is a well known caveat amongst professional computer Techs.
Perhaps checking with your local computer repair shop or an independent professional computer Tech prior to your next Windows upgrade would result in a cleaner upgrade without issues such as you experienced.
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