Deleting a file by mistake happens to everyone. This article walks you through immediate techniques to attempt recovery, explains the limits imposed by overwriting and by different file systems, and tells you when to stop and contact a professional service. If you bought a backup solution from Licensgo, such as Acronis True Image Advanced, setting it up now can reduce the risk of permanent loss.
1What happens when a file is deleted
On most operating systems, a deleted file is not immediately erased: the OS marks the space as free and removes the references to it. Until that space is overwritten, recovery is possible. The exact behaviour depends on the file system — NTFS, exFAT, APFS, ext4 — and on whether the storage is an HDD or an SSD.
SSDs with TRIM and modern OSs may zero out freed blocks, reducing recovery chances. Also, some secure-delete utilities overwrite data immediately to prevent recovery.
2Step 1 — stop using the drive
The single most important action: stop writing to the storage device at once. Any operation (downloads, installs, even browsing) can overwrite the space occupied by the deleted file and make recovery impossible.
- Disconnect the external drive or USB stick;
- If it is the system SSD, shut down the computer and consider recovering from an image;
- Do not install recovery software on the drive you want to recover from.
Every minute of use reduces the chances of recovery — power down or disconnect the drive as soon as you can.
3Step 2 — recovery software and how to use it
There are many recovery tools that perform quick and deep scans. Look for software that supports your file system and can preview recovered files. Run scans from a different disk or bootable media to avoid writes to the target drive.
Typical workflow: attach the affected drive as a secondary drive, run a read-only scan, preview the results and recover only the files you need to a different volume.
- Quick scan to find recently deleted files;
- Deep scan for fragments and older metadata;
- Save recovered files to a different drive.
4File-system differences and overwriting limits
NTFS, exFAT, APFS and ext4 handle deletion metadata differently. On HDDs, deleted data may persist until overwritten; on SSDs with TRIM the controller often clears blocks promptly. RAID arrays, encryption and compressed files complicate recovery.
If the volume was encrypted (for example, with full-disk encryption), recovery is only possible if you have the decryption keys. For a comparison of disk and file encryption, see disk encryption vs file encryption.
Before attempting recovery, find out whether your drive is an HDD or an SSD and which filesystem it uses.
5Prevention — backups and good habits
Prevention is the cheapest and most reliable approach. Regular backups, versioning and off-site copies limit the need for recovery. If you don't have a backup routine yet, read our practical recommendations on backups: practical backup strategies.
Consider solutions that automate image-based backups and provide quick recovery points, reducing downtime and the risk of permanent loss.
- regular backups with versioning;
- off-site or cloud copy;
- periodic restore tests.
6When to call professional data recovery
Stop and contact a specialist if the drive makes unusual noises, the system can't recognise the disk, or several recovery attempts fail. Professional labs have controlled environments (clean rooms), specialised tools and the expertise to image damaged media and extract data with minimal further risk.
Be aware of costs and success rates: professionals increase the probability of recovery on physically damaged media, but there are no guarantees if data has been overwritten.
If you suspect a hardware fault, avoid DIY fixes and contact a certified recovery lab quickly.
