WizTree is vastly faster than the other options presented here (Scanner, SpaceSniffer, WinDirStat).

WizTree v3.33 is the last 'donationware' version vs. free for personal use now.

https://diskanalyzer.com/wiztree-old-versions

Switched to this a few years ago. Far better than anything else I've tried.

It's also the one that's much more regularly updated.

I'm personally a fan of SpaceSniffer: http://www.uderzo.it/main_products/space_sniffer/index.html

While we're listing them, Disk Inventory X (https://www.derlien.com/)

Thanks for sharing! I really like the real time update during progress. You sometimes have to wait a very long time in Scanner before you see the result.

I find myself using WinDirStat on Windows systems, but often use ncdu in WSL.

On Windows, you should switch to WizTree. Rather than recursively calling directory listing functions, it directly reads and parses the file tables itself. This makes it orders of magnitude faster. I have a 2 TB hard drive full of a million files, and WizTree reads and parses it all in under a minute, whereas I can expect WinDirStat to take half an hour.

On an SSD, WizTree only takes a couple seconds.

For all the hate NTFS gets, MFT has led to the creation to two amazing tools: Everything and WizTree. Unfortunately both proprietary although freeware.

Thanks for the suggestion!

You should try Directory Report on Windows. It is faster than WinDirStat. Has more filtering and reporting than WinDirStat. Can find duplicate files too

I use WinDirStat on Windows

https://windirstat.net/

You should switch to WizTree. Rather than recursively calling directory listing functions, it directly reads and parses the file tables itself. This makes it orders of magnitude faster. I have a 2 TB hard drive full of a million files, and WizTree reads and parses it all in under a minute, whereas I can expect WinDirStat to take half an hour.

On an SSD, WizTree only takes a couple seconds.

`dua`, discussed elsewhere in this thread also works on windows, just for another option.