nukecad - Thank you for taking the time to respond.
How 'LARGE' is the drive? - Upwards of 900+GB. (Do not know exactly). Sadly, I am a Civil-Structural-Chemical guy...Is it an HDD or an SSD? (Maxtor OneTouch 4). SSD, I think...?What filesystem was/is it formatted with? - No idea...How full was it? - Used 600GB with 300+ remaining...Do not know exactly, but this is fairly accurate as I viewed it before I began the process.How fragmented was it? - (39%).
The process indicated that it would take >1 day to complete. So I began the process and let it run accordingly. Came back yesterday morning to nothing other than my Start-Up Screen. No statistics or Status whatsoever. It was if the Program was simply closed.
The last time I viewed it it was at (18%) complete. No error messages whatsoever.
I was attempting a "full" defragment.
Windows 10 with Defender, Malwarebytes (as required) and I run Ccleaner as well, as prompted to do so.
Again, Many Thanks for your assistance!