Windows 10: Change Win 10 Boot Drive

I would like to change my primary boot drive from my current C to E, an ssd with only 128G of storage. My C drive is nearly full at ~850G, so I can't just migrate everything. I know how to change the primary boot drive in BIOS, but don't know what files need to move such that Windows can actually boot from it.

:)

 

Win 10 boots...

Interesting that it works on that oldie but goody laptop.

I don't notice any speed lags with Win-10 TP, but I'm using it on an i5-4670K system with an SSD for the boot drive, so it's snappy.

 

Recommend hardware changes for upgrading from Win-7 to Win-10

Bree
I followed your suggestions (2nd Aug 19) for installing Win-10. Made the bootable flash drive successfully through the media creation tool. But when I attempted to upgrade and activate to Win-10 (64 bit) from within Win-7 (Pro-32 bit), I got the following error message:

Error # OxC1900101-Ox20017. " The installation failed in the SAFE_OS phase with an error during BOOT operation"

I read the diagnostics under this error number and carried out the proposed fixes, i.e. update Win-7, uninstall Malwarebyte antivirus, disconnect all external hardware, e.g. printer, scanner, external hard drives. I then tried to repeat the steps to do the upgrade through the Win-10 bootable flash drive as before. Got the same error message.
Appreciate any further comments and suggestions as to (a) what does a failure in the SAFE_OS during boot operation mean, (b) what can I do to solve it. Is this anything to do with the hardware in my computer? I listed these in my first posting above.
Thanks for any help

 

Win 10 boots...

Anyone else notice Win 10 boots much faster into Windows? I mean much, much faster.
I am now getting into Windows almost as fast as my SSD drive on my other machine.
It's crazy fast for me.