What DiskRaptor Does

DiskRaptor is a free, open-source disk space analyzer for Windows, macOS, and Linux that helps you figure out exactly what is eating your drive space. It scans drives and folders, locates large files, finds duplicates, searches for files, and offers several ways to visualize where your storage went. There are also cleanup and browser tools tucked inside, making DiskRaptor considerably more than another "show me the biggest folder" utility.

DiskRaptor scans your drives and folders and shows where your storage is being used. Results can be explored through a traditional file tree along with pie charts, bar charts, a treemap, and a rather unusual 3D Galaxy view. Which, though I am not sure how useful this Galaxy view is, it was super fun to play with.

Oh, and, let me be really clear…. this thing is FAST! It scanned my test 2TB drive in 5.84 seconds.

It also includes duplicate detection, file searching, empty-folder scanning, cleanup tools, browser cleanup, report exports, Trash recovery, and S.M.A.R.T. drive information.

Why Someone Would Use DiskRaptor

The obvious situation is when your C: drive suddenly has 15 GB free and you could swear it had 100 GB a few months ago.

Windows can give you a general idea of what's using storage, but that doesn't always tell you what you really want to know: exactly which file or folder is responsible?

DiskRaptor lets you start at the drive level and work your way down. Maybe it's an old game, a forgotten virtual machine, a folder full of videos, application caches, or some program that has been quietly collecting log files since the dawn of time.

That's the basic job, but after using DiskRaptor for a while, I found myself using some of the other tools just as much.

File Searching Is Seriously Fast

DiskRaptor includes its own file search system, and this turned out to be one of the more pleasant surprises.

In my testing, searches were extremely fast, to the point where the experience was comparable to using Everything. That's high praise because Everything has been my benchmark for "type it and the file is already there" Windows searching for years.

Having fast search built into a disk analyzer makes a lot of sense. You can identify where your storage is going and then immediately start hunting for particular filenames or file types without jumping into another program.

For someone doing cleanup or troubleshooting, that can be just as useful as all the fancy disk charts.

The Scan Found a 512 GB File on My PC

Here's where testing DiskRaptor on a real machine got interesting.

During a system scan, it reported a huge file buried under Google Play Games:

\AppData\Local\Google\Play Games\userdata_j2t01gdr.zfn\avd\userdata.img

DiskRaptor showed userdata.img as 512 GB.

That's the kind of result that makes you stop scrolling.

One right-click later, DiskRaptor took me directly to the file so I could see what it was. It turns out that userdata.img belongs to the virtual Android environment used by Google Play Games on PC.

And no, it wasn't actually consuming 512 GB of my drive.

Sparse Files Can Fool Disk Space Scanners

The Google userdata.img file is a sparse file.

A sparse file can have a very large logical size while consuming considerably less physical storage. Windows only needs to allocate disk space to portions of the file where data has actually been written.

So the file can effectively say, "I'm 512 GB," without actually occupying 512 GB on your SSD.

DiskRaptor was reporting the size the file advertised rather than the physical storage it was actually consuming. That's worth knowing because it can make the numbers in a disk space analyzer look considerably scarier than reality.

It's also a good reminder not to blindly delete the biggest thing a disk analyzer finds.

In this case, deleting userdata.img because it appears to be a 512 GB space hog would be a bad idea. It's part of the Google Play Games virtual machine, and removing it could break that environment or wipe its data.

This actually demonstrated one of the things I liked about DiskRaptor. It showed me something unusual, and a right-click took me straight to the file so I could investigate.

Disk analyzers are very good at pointing fingers. You still need to make sure the accused is guilty before hitting Delete.

The Right-Click Options Are Actually Useful

That Google Play Games discovery also made me appreciate DiskRaptor's context menu.

Right-clicking an item gives you quick access to useful actions instead of forcing you to manually navigate through Explorer. You can jump to the file or folder, open a terminal at that location, copy information, check properties, or work with the selected location directly.

It sounds like a small thing until you're five levels deep in AppData trying to figure out which application created a mysterious 30 GB file.

One right-click and being taken directly there is exactly how a disk analyzer should work.

Several Ways to See Where Your Space Went

DiskRaptor gives you several visualization options:

The treemap will be familiar to anyone who has used WinDirStat or similar disk analyzers. Large files become large blocks, making obvious space hogs easy to spot.

The Galaxy view is considerably less conventional. Whether it helps you understand your storage better or simply lets you fly around your SSD like you're looking for the Death Star is going to depend on the user.

Fortunately, it isn't forced on you. I generally prefer the file tree and treemap when I'm actually trying to solve a problem.

Duplicate Files and Empty Folders

DiskRaptor includes a duplicate-file finder that compares file contents rather than relying entirely on filenames.

That's important because these could all potentially be the same file:

vacation.jpg
vacation-copy.jpg
vacation-final.jpg
vacation-final-FINAL.jpg
vacation-final-FINAL-USE-THIS-ONE.jpg

Anyone who has managed photos or work files for long enough knows exactly how that happens.

Content-based duplicate detection can find identical files even after they've been renamed. That makes it useful for photos, downloads, installers, backups, music collections, and folders copied between multiple computers over the years.

Just don't automatically delete everything marked as a duplicate. Applications sometimes intentionally keep identical files in different locations.

There is also an empty-folder finder. Empty folders aren't going to recover meaningful drive space, but they can be useful for cleaning out the remains of programs that were supposedly uninstalled five years ago.

Browser Cleanup Tools Are a Nice Surprise

The browser cleanup tools are another area worth exploring.

DiskRaptor provides tools for identifying and cleaning browser-related data, and the interface makes it easy to see what you're dealing with before doing anything.

There are quite a few cleanup options to play with, and I like having them available alongside the disk analysis tools. Browser caches and related data can grow considerably over time, so it makes sense to include them in a program designed to figure out where your storage went.

As with any cleanup utility, take a second to look at what you've selected before deleting everything just because there's a button that allows it.

S.M.A.R.T. Didn't Work for Us

DiskRaptor also includes a S.M.A.R.T. feature intended to display health information reported by supported storage drives.

Unfortunately, that function didn't appear to be working with the version we tested.

That isn't a deal breaker because S.M.A.R.T. monitoring isn't the main reason to install DiskRaptor, but it's worth mentioning if you're expecting the program to double as your drive-health utility.

Hopefully that gets sorted out in a future release. For now, I'd use a dedicated S.M.A.R.T. monitoring utility if drive health is what you're actually trying to diagnose.

Reports and Other Useful Tools

DiskRaptor can export scan information in HTML, CSV, and JSON formats.

HTML is handy when you want a readable report with statistics and charts. CSV and JSON are more useful for admins or geeks who want to process the information elsewhere.

You can also filter results by common file types, including images, video, audio, archives, and PDFs. If you already suspect that video files are responsible for your missing 200 GB, filtering out everything else makes finding them considerably easier.

Trash Recovery lets you browse deleted items, restore them, or permanently remove them. That's a sensible feature for software that encourages you to go hunting for files to delete.

Useful Features Worth Knowing

Limitations and Downsides

The sparse-file issue is the biggest thing we ran into during actual use.

Reporting a 512 GB sparse file as though it represents 512 GB of disk usage can seriously distort what you're seeing when the entire purpose of the program is to figure out where your physical storage went. I'd like to see DiskRaptor clearly distinguish between logical file size and allocated size.

The S.M.A.R.T. function also didn't appear to work in the version we tested.

There are also a lot of features here. That's mostly a positive, but someone looking for the absolute simplest possible disk analyzer might find themselves wondering why they're flying through a 3D Galaxy when all they wanted to know was why C: is full.

Finally, DiskRaptor can tell you where a large file lives. It can't always tell you whether that file is safe to remove.

Our Google Play Games example demonstrates that perfectly. A mysterious 512 GB file looks like the mother lode when you're cleaning a drive, but deleting it would have been exactly the wrong response.

Geek Verdict

DiskRaptor turned out to be considerably more interesting than I expected from another disk space analyzer.

The basic scanning and visualizations work as you'd expect, but the fast file search, duplicate finder, browser cleanup tools, right-click shortcuts, filters, Trash tools, and reports give you plenty to explore after the initial scan. The built-in search was particularly impressive. In our testing, it felt comparable in speed to Everything, which isn't something I say lightly.

I also liked how quickly I could investigate something suspicious. When that supposed 512 GB Google Play Games file appeared, one right-click got me exactly where I needed to be. It also exposed an area that could use improvement, since sparse files need to be distinguished from the amount of physical disk space they're actually consuming.

S.M.A.R.T. also wasn't working for us, so there are clearly still a few rough edges.

Even with those issues, there's a lot to like here. DiskRaptor takes the familiar disk-space analyzer idea and piles on enough genuinely useful tools to make it worth exploring.

And if it tells you a single file is using 512 GB, don't immediately delete the damn thing. Sometimes 512 GB isn't really 512 GB.