Installing win10 or upgrading win7 to 10?
Do you have the means to make a backup or do you not care about what is on the HDD?
** The 'Cliff Notes' version: **
1: Backup the HDD - backup anything you wish to save from the HDD. Write down Account names, Passwords Activation keys, favorite websites
2A: Actually Installing W10 to the SSD
- this you will do that with the HDD disconnected. When done & drivers are loaded and W10 is updated, you can attach the HDD, and either format it and copy in your backed up items or simply delete the folders you no longer need.
2B: Updating W7 to W10 -
- Clone W7 to the SSD, swap the SSD inplace of the HDD and set the HDD aside. Boot up with only the SSD and update to W10 on it; Motherboard drivers and Updates.
Note: W10 will delete incompatible programs, often without notifying you which ones they are. W10 will load MS drivers typically so be sure to load your latest motherbd drivers when it's done.
3: Power off and install your HDD. you can either Wipe/format it, chose to let things remain as is, or delete folders you no longer need, Remember to copy in those items you saved in step 1, they aren't considered a backup until they become a 2nd copy again.