How to Recover Data from a Formatted External Drive on Mac

Formatting an external drive that still had files on it is a sinking feeling — but external drives are often the most recoverable case there is. Many are traditional hard drives, which hold onto data far longer than an SSD, and most external drives don't aggressively erase deleted blocks the way a Mac's internal SSD does. If you stop using the drive now, your chances are genuinely good. This guide walks through exactly what to do.

One rule before anything else: stop writing to the formatted drive immediately. Don't copy files to it, don't reformat it again, don't "test" it by saving something. Every write risks overwriting the data you want back. Unplug it if you have to, and don't reconnect until you're ready to scan.

Two things work in your favor. First, a lot of external drives — especially larger desktop drives and older portable ones — are spinning hard disks (HDDs). On an HDD, deleted or orphaned data lingers until something physically overwrites it, which can be a long time on a drive you've stopped using.

Second, even external SSDs and USB sticks frequently don't pass TRIM commands through to the drive, so they don't self-erase deleted data the way a Mac's internal SSD does. That's the opposite of the tougher internal-SSD situation described in our guide on APFS, TRIM, and SSD recovery. On external media, the data tends to wait for you.

How the drive was formatted matters. A quick format — the default in most cases — mostly rewrites the drive's filesystem bookkeeping (its index of what's where) while leaving the actual file data sitting in place. The files are orphaned, not erased, and a deep scan can carve them right back out.

A full or secure erase is different: it deliberately overwrites the entire drive, and once that's complete the data is genuinely gone. If you ran a full secure erase, recovery software can't bring it back. The good news is that quick format is far more common, so most formatting accidents are recoverable.

Drive format matters too. External drives are commonly exFAT (cross-platform), NTFS (often from Windows use), or HFS+ (older Mac drives), and sometimes APFS. DataRecover Pro reads all of them, so it doesn't matter which one the drive used before you formatted it.

1. Stop using the drive. Unplug it if there's any chance something might write to it.

2. Connect it to your Mac and open DataRecover Pro. Install the app on your Mac's internal disk, not on the external drive you're recovering.

3. Run a quick scan first. If the format was very recent, a quick scan may still surface files with names intact.

4. Run a deep scan. This is the key step for a formatted drive — deep scan carves files straight from raw disk blocks by their format signatures, recovering data even though the format wiped the filesystem's index. DataRecover Pro recognizes 47+ formats, including documents, photos, video, and camera RAW.

5. Preview to verify. Use the free thumbnails, metadata, Quick Look, and per-file confidence scores to confirm your files are intact before you recover. Scanning and preview are free, read-only, and need no account, so you risk nothing by downloading DataRecover Pro and scanning the drive to see what's there.

6. Recover to a different drive. Save recovered files to your Mac or another external disk — never back onto the drive you just scanned. Writing them back onto the source is the easiest way to overwrite files you haven't recovered yet.

Files recovered from a formatted drive occasionally open with errors — a photo that shows gray, a video that won't play. The data is mostly there; the structure is damaged. DataRecover Pro's repair engine rebuilds corrupted photos, videos, and documents as part of recovery, so you get files that open rather than broken bytes — something recovery-only tools don't do. Repair runs sandboxed, with no network or filesystem-write access, so a malformed file can't harm your Mac.

If the external drive is clicking, grinding, not being recognized, or dropping its connection repeatedly, that's mechanical failure, not a formatting problem — stop and consult a data-recovery lab. And whatever the format was, the recovery path is the same idea across filesystems; if your drive was formatted as APFS, our complete APFS recovery guide covers the volume-specific details, and for cross-platform sticks and SD cards, see exFAT drive recovery on Mac.