Do I need to defrag my Hard Drive?

Yeremyah said:

So leave it alone forever?

Does Windows 10 automatically defrag it? If so, do I need to DISABLE W10 defrag?

You can let Windows optimize your SSD. It WON'T defrag it in the sense that you're probably asking. More details here: http://www.hanselman.com/blog/TheRea...ntYourSSD.aspx

Yeremyah said:

I checked Defrag in my W10, and it says it's defragging weekly automatically. Should I turn it OFF completely, or change it to monthly?

It's NOT defragging it unless Windows has it misidentified as a spinner. If you trigger it manually, it's ONLY doing TRIM, hence the quick execution.

Never defrag an SSD, it would only damage the SSD thus shorten its life time.
Trimming is however useful for SSD's, but not really necessary.

Per link in post #4 assuming you found it TL;DR -

Hanselman said:

Conclusion

No, Windows is not foolishly or blindly running a defrag on your SSD every night, and no, Windows defrag isn't shortening the life of your SSD unnecessarily. Modern SSDs don't work the same way that we are used to with traditional hard drives.
Yes, your SSD's file system sometimes needs a kind of defragmentation and that's handled by Windows, monthly by default, when appropriate. The intent is to maximize performance and a long life. If you disable defragmentation completely, you are taking a risk that your filesystem metadata could reach maximum fragmentation and get you potentially in trouble.