Deleted Files by Mistake? What to Do First

When a file is deleted, the operating system normally does not wipe its contents. It marks the space the file occupied as available and removes the entry that pointed to it. The data usually stays where it was until new data is written over it, which is why deleted files can often be recovered, and why the time that passes and the amount written in the meantime matter so much.

Every new file saved, every download, every update and even the system's own background activity can overwrite space that held the deleted file. If the files are important, stop using the drive as soon as you notice. On the drive that holds the operating system, that means shutting the computer down rather than carrying on working. If the drive can be connected to another computer as a secondary disk, that is a safer way to work with it.

Before any recovery attempt, check the Recycle Bin or Trash, and the Previous Versions or File History features if they were switched on. Cloud storage services often keep deleted files for a limited period in their own bin, and a backup, a synced copy or an email attachment may hold a version. These routes do not risk overwriting anything on the original drive, so they are worth trying first.

On a solid-state drive, the operating system usually tells the drive which blocks are no longer in use, using a feature called TRIM, and the drive may then erase them in the background. That can make deleted files unrecoverable within a short time, much sooner than on a traditional hard drive. If the files were on an SSD, the chances depend heavily on how quickly the drive was left alone.

A quick format normally clears the file system structures and leaves most of the data in place. A full format in current versions of Windows writes over the whole drive, which removes the data for good. Whether a drive was quick-formatted or fully formatted is therefore an important detail for recovery. Restoring a backup, reinstalling the system or copying large amounts of data onto the drive all overwrite space, and are best avoided until the important files are safe.

Install it on a different drive from the one being scanned, and save recovered files to a third location, never back onto the source drive. Choose a tool that scans read-only and lets you preview what it found before you pay. If the drive is making unusual sounds, disappears from the system or is very slow, stop, because scanning a failing drive puts extra strain on it.

If the files matter and the drive is failing, has been formatted, or is an SSD, a specialist assessment before further attempts gives the best chance. We have solved many cases like this, but each further write to the drive reduces what can be recovered.