Link: https://defrag98.com/

Watch a disk defragment online, free. A browser-based Windows 98 Disk Defragmenter simulator with real HDD sounds and 4 drives. No install, works offline.

Hmm, I appreciate it, but it's not moving data out of the way to clear soon to be used space. And when it's reading the fragmented data, it's reading it backwards... the fragmented data should probably already have been written forwards, so it should grab it in the same order it is writing it to the defragmented section.

And just for flavour, since even light background tasks in those days would have influenced it, could add a bit of random latency to each operation with small chances of notable latency, like a 1% chance of 2-3 second chunks of wait time. With an appropriate hard drive sound.

Wasn't there several colors too?

Progress Quest - Chapter Zero

I'm trying to remember, I feel like yes, but I can't think of what they would have designated. Maybe compressed data?

unread, read and temp relocated and final relocated?,

Ah, temp relocated, yes. That makes sense. Since it is also what is missing here. And I think it was a lighter shade of blue than final relocated.

I can clearly remember watching the temporary area[s] getting larger and more efficient as the defrag started to make progress. I can also remember asking where the defrag tool was in linux back in cica 2000

Not sure 98 did. Think that was XP.

I think it was like the boot sector and stuff like that.