Do not install data recovery software on the drive you want to recover

A deleted folder on a Warsaw company laptop can still be recoverable until Windows downloads an installer, expands temporary files and writes browser cache over the same space. The source drive is not a workbench. It is the evidence.

Why installing on the same drive is risky

Deleted files are often not erased immediately. The file system marks their clusters as available. Installers, logs, thumbnails, browser downloads, Windows Update files and recovery program caches can land exactly in those areas.

Even when software later finds file names, the contents may already be partially overwritten. That is why the first rule is not about brand of software; it is about not writing to the source medium.

When recovery software can make sense

Software can make sense when the device is physically healthy, the loss is logical and the program is installed on another drive or another computer. The scan target and the save destination must be different from the source device.

For RAW or format-prompt cases, start with RAW drive: do not format before choosing tools.

When to stop and not scan the device

Stop if the drive clicks, disappears, freezes the computer, reports I/O errors, shows the wrong capacity or contains the only copy of critical files. Long scans can stress unstable media and create more unreadable areas.

If CRC errors appear during copying, read CRC data error while copying files.

A safer recovery workflow

1. Stop using the source drive.
2. Install tools on a different computer or drive.
3. Create a sector image when the device is stable enough.
4. Scan the image or a controlled copy, not the only original.
5. Save recovered files to separate storage.

What to do instead of downloading another program

Write down what happened: deletion, formatting, RAW state, failed copy, power loss, software crash or earlier repair attempts. Then decide whether the case is safe for software or needs diagnosis first.

For cases where someone already formatted the device, read do not format the device before recovery.

What counts as writing to the source drive?

Installing an app is only one example. Saving screenshots, exporting recovered files, letting cloud sync download placeholders, creating ZIP archives, running system updates or opening heavy applications can all write new data.

On SSD/NVMe drives, writes and deletion can combine with TRIM and garbage collection, which is why speed matters. For that scenario, see TRIM and deleted files on SSD.