Point FastFolder at a drive and it tells you what's eating it — biggest folders, biggest files, biggest file types. Built for support desks, so the answer lands on the clipboard ready to paste into a ticket.
FastFolder doesn't bundle a runtime, which is why it isn't a 60 MB download. Install it properly, or carry the single exe on a USB stick.
Signed setup wizard — installs to Program Files with shortcuts and a proper uninstaller, and fetches the .NET runtime if the machine doesn't have it. /VERYSILENT for unattended rollout.
Copy it to a USB stick or a share and run it. Nothing to install, no admin rights needed to deploy it.
One prerequisite: the .NET Desktop Runtime 8 or newer (x64). The installer checks for it and, only if it's missing, downloads it from Microsoft and verifies Microsoft's signature before installing it. The portable exe relies on the standard Windows prompt, which links to the same download.
Focused, not bloated — the DataHaat way. FastFolder answers one question properly and gets out of your way.
Clicking a drive lists that level in milliseconds, even on a 4 TB volume. Nothing recursive ever starts from a single click.
One tab lists the 300 biggest files anywhere in the measurement; another finds the big ones nobody has touched in a year or more. This is usually the whole answer.
Grouped by extension, so a runaway pile of .log, .bak, .iso or .vhdx files gives itself away.
A used/free bar for each volume, amber past 75% and red past 90% — you can see the problem before you click it.
Starts as a normal user with no UAC prompt. When a profile or system folder says "access denied", elevate from inside the window.
Copy a plain-text summary formatted to paste straight into a ticket, or export whatever tab you're on to CSV.
FastFolder checks DataHaat for new releases and verifies the SHA-256 and the publisher's signature of what it downloads before installing it.
A dark look for long shifts and a light one for daylight — it remembers which you chose between runs.
The measured folder drawn as nested boxes, each sized by what it holds. The big one is obvious; double-click it to go inside.
Finds files with identical content — by size, then a quick look at each file's start and end, then a full SHA-256 — and shows what keeping one copy of each would free.
Save a measurement, come back another day, and a step-by-step wizard lists every folder that grew, shrank, appeared or vanished.
Sizes the usual space hogs and says which are safe to delete. Safe ones clean from inside the app, after a confirmation that lists exactly what goes.
Most analyzers make you wait for a full recursive scan before showing anything. FastFolder separates the cheap operation from the expensive one, so you only pay for the deep walk when you actually want it.
Listing is instant. Click a drive or double-click a folder and you get that one level — subfolders, plus the files sitting directly in it at their real sizes. Often that alone finds the culprit.
Measuring is deliberate. Press F5 or "Measure this folder" to walk everything underneath, with a live progress bar. Until then, subfolders honestly read not measured rather than showing a fake zero.
Then the shares appear. Once there's a total, each row gets its share bar and the summary cards fill in — total size, files, folders, unreadable folders and elapsed time.
Right-click any row for Open in Explorer, Copy full path, or Scan this folder as root.
Apart from checking for updates, FastFolder sends one thing: an anonymous count, about once a day, so we know how many machines run it and which versions are still in use. It is on unless you turn it off, and turning it off takes one click.
A random ID this copy made up the first time it ran, the FastFolder version, the Windows build number, whether it was installed or runs as the portable exe, and how many times it has started since it last reported.
Nothing about your disks — no drive, folder or file names, no paths, no sizes, no owners. No computer name, user name or domain. The ID is random, never taken from the hardware.
To updatescannerapp.datahaat.com — the same server FastFolder already checks for updates. We keep it against the random ID, by date only; the record holds no IP address.
In FastFolder, press F1 and untick Report that this copy exists, once a day in section 12 of the help. For a whole fleet, see below.
For administrators. A REG_DWORD value named UsageReporting set to 0 under HKLM\SOFTWARE\DataHaat turns it off for every DataHaat product on the machine; under HKLM\SOFTWARE\DataHaat\FastFolder it turns off FastFolder alone. The environment variable DATAHAAT_USAGE_REPORTING=0 does the same. Your setting overrides the user's. Blocking updatescannerapp.datahaat.com stops it as well — but it also stops FastFolder's updates, which come from the same server. It is only ever sent with an update check.
What we keep. Daily records are deleted after about 13 months; what stays is a one-line summary per copy — first and last day seen, version, Windows build, installed or portable, and total starts. Like any website, our servers also keep ordinary access logs, which do record the address a request came from. Questions: info@datahaat.com.
Free, signed and under a megabyte. Install it on the machines you support and stop guessing where the space went.