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Disk Inventory X was kind of nice, but it is painfully slow.

Are there any modern and faster alternatives?

I only care about the disk space, and not about the file type stats and about the graph which Disk Inventory X displays.

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The speed is primarily a function of disc size, number of files and disc speed. I doubt whether other applications can be significantly faster – patrix Feb 9 '13 at 10:27
@patrix uh? If, for instance, it was badly coded, of course there might be faster alternatives. How can you know it is state-of-the-art? – o0'. Feb 9 '13 at 10:46
Edited to point out I only care about disk space and not the other fancy stuff. – o0'. Feb 9 '13 at 10:46
I didn't say it's state of the art. But traversing a filesystem and gathering statistics is bound to be slow due to hardware effects. And whether the application just reads file sizes or also the other stuff doesn't really matter. But let's see whether somebody comes up with answers. – patrix Feb 9 '13 at 10:47
1 maybe? Not graphical though – patrix Feb 9 '13 at 10:53
up vote 12 down vote accepted

OmniGroup offers a free utility called OmniDisksweeper which lists files/folders sorted by size.

OmniDiskSweeper is really great at what it does: showing you the files on your drive, in descending order by size, and letting you delete them easily! It scans your disks as quickly as possible and shows you the facts — if a file doesn't make the cut to stay, just click the big Delete button and be done with it. It's a fast, easy way to find those large files cluttering up your drive and clearing them out for new, better things. Make sure you want them gone, though. There's no going back

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Orders of magnitude faster than Disk Inventory X, it would be great if not for some quirks, such as not being able to right click the files (to either open in finder or send them to the bin): it can only delete them. Still much better, though. – o0'. Feb 9 '13 at 13:12
Update: you can open the files, only using a specific icon down right or down left, but not right clicking, or through the menu bar. I reiterate: much better than the alternative, but it has so many UI mistakes... – o0'. Oct 13 '13 at 9:33
The problem with OmniDiskSweeper is that it does not display a visual tree map like Disk Inventory X. Without the tree map it is impossible to find large files in otherwise small folders simply by scanning the image for large rectangles. – mgd Nov 22 '14 at 9:33
This is a great replacement for Disk Inventory X. I do miss the visual tree map, but the browser view works and forces a different flow. – pfeilbr Dec 4 '15 at 15:10
This helped a ton! thank you. I just removed over 90GB from the downloads directory. hahahaha – tlindell May 23 at 14:32

I think DiskInventory is as fast or slow as any of the others. If the disk is big, it slower than on a little one, and of course, on a SSD it is really fast. Allthough it is from 2006, I think it isn't bad coded, and it still works on my 10.9. It gives more info than you need, but you can ignore that, as long as you find what you need. I guess what takes time is the reading of the disc, an app without the details of kind of info won't, as far as I think, really take much less. I am using it for ages now, there was a time in mavericks it didnt work, now it goes well. I haven't tried grand perspective, it seems to make the same (with more alternatives which you anyhow don't seem to need), but is fresher.

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Disk Inventory X is definitely slower than both OmniSweeper and GrandPerspective on my MacBook Pro with 500GB SSD. That said, GrandPerspective is IMHO a much better alternative to Disk Inventory X than OmniSweeper simply because GrandPerspective also includes the visual tree map without which it is virtually impossible to find single large files. With the tree map you can simply scan the image for large rectangles (large files or large folders). – mgd Nov 22 '14 at 9:44
...and Disk Inventory X (which has served me well) constantly crashes during scan on OS X Mavericks. – mgd Nov 22 '14 at 9:50
Grandperspectiv is seeing frequent updates currently. This is the correct answer to the original question. – Eric Drechsel May 11 at 5:42

Daisy Disk seems to be faster, but costs money. This process will always take longer than you want, though (I don't think OSX allows access to disk index files).

You can try one of the Linux based tools, such as PhileSight and see what happens too. Will be alot quicker if it works.

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