as in many many terabytes......

It just happens to include an enormous amount of small, loose files.

I was working 3rd shift and would be done with work a couple hours before end of shift. So on the NEC Powermate II desktop with a somewhere like 20 meg mfm hard drive, I would copy a bunch of stuff to a directory, delete the original, then run Speeddisk and watch the cursor move a block at a time. Usually took a second per block. Then once done I would copy the stuff back and do it again. Over and over.

What are you running, the built in one? Not as cool to watch.

MS defrag was a licensed copy of Norton Speeddisk

Still has the fun interface.

It was kinda fun! But I probly had a later version than the one you're showing. My HD was abt. 500 MB, and I thought, "I will NEVER fill this monster!"

As I recall, the problem of disk fragmentation was solved back when the Amiga was getting its first hard drives. (I have an Amiga that belonged to a small video production company stashed away in my garage. It was discarded as e-waste.)

Apple and Linux computers don't generally suffer any fragmentation issues until the disk is about 95% full, at which point it's probably prudent to buy a bigger storage system than suffer any aggressive defragmentation processes. If fragmentation becomes an issue it's a good indication the system is already suffering more serious issues.

Google uses Linux file systems.

I quit Microsoft for Linux at Windows 98SE, which I could easily do because I'm not tied by employment to any Microsoft dependent products such as Photoshop or AutoCad. Defragmenting Widows 98 machines whenever videos started to get glitchy is not a happy memory, but it did appeal to certain aspects of my OCD.