When Windows detects a problem with an external hard drive, it often shows the message "fix external hard drive without formatting" scenario — a prompt saying the drive needs to be formatted before use. Clicking Format would erase everything. In many cases, the files are still physically on the drive; only the file system structure is corrupted. This guide covers the safe steps to attempt recovery without formatting, in the right order.
Part 1. Why Windows Asks You to Format (and What RAW Means)
When Windows cannot read a drive's file system, it labels the drive as RAW — a state where the operating system sees the drive but cannot interpret its contents. The Format prompt appears because Windows has no other way to make the drive usable without rebuilding the file system.
Common causes of a RAW external hard drive:
| Cause | What Happens |
|---|---|
| Unsafe ejection | File system tables written mid-operation become corrupted |
| Power outage during write | Interrupted write corrupts directory structure |
| Bad sectors in critical areas | Damage in file system storage areas makes drive unreadable |
| Virus or malware | Malicious modification of partition table or boot sector |
| Accidental partial format | User stopped a format midway |
⚠️ Important: Do not click Format when Windows prompts you. Formatting will overwrite the file system and make recovery significantly harder — even with recovery software, a post-format scan recovers fewer files with less metadata than recovering from an intact but corrupted file system.
Part 2. First Step: Try CHKDSK on the External Drive
CHKDSK can fix file system errors on external drives the same way it does on internal drives. This is the first repair attempt to make.
Run CHKDSK on your external drive:
- Connect the external drive and note its drive letter (e.g., E:)
- Open Command Prompt as Administrator (
Win + X→ Command Prompt Admin) - Run:
chkdsk E: /f /r(replace E: with your drive letter) - Wait for the scan and repair to complete — this can take 30 minutes or more
💡 Tip: If CHKDSK returns the message "The type of the file system is RAW. CHKDSK is not available for RAW drives," the file system is too corrupted for CHKDSK to work. Skip directly to Part 3 — TestDisk.
What CHKDSK fixes: directory inconsistencies, bad sector mapping, file allocation table errors. What CHKDSK cannot fix: a fully RAW partition where the file system is unrecognizable.
After CHKDSK completes, disconnect and reconnect the drive. If it appears normally in File Explorer, immediately copy all important files to another drive before doing anything else.
Part 3. Use TestDisk to Repair a RAW or Lost Partition
When CHKDSK cannot help, TestDisk is the most powerful free tool for recovering a RAW drive without formatting. It works by scanning for lost partition signatures and rewriting the partition table.
Basic TestDisk process:
- Download TestDisk from cgsecurity.org — it requires no installation
- Run TestDisk as Administrator and select the external drive
- Choose Analyse → Quick Search to scan for lost partitions
- If it finds your original partition, select Write to restore the partition table
- Restart the computer and check if the drive is accessible again
💡 Tip: In TestDisk, always run Analyse in read-only mode first to confirm it has found the correct partition before selecting Write. Writing an incorrect partition entry can make recovery harder.
TestDisk is a command-line tool — it has no graphical interface. If you are not comfortable with text-based menus, DiskGenius offers a graphical alternative that performs similar partition recovery with a Windows-style interface.
🗣️ r/techsupport user who recovered a RAW external drive: "TestDisk found my partition on the first quick search. Wrote the partition table, restarted, and everything was back. Took about 20 minutes total."
Part 4. Recover Files First If the Drive Is Severely Damaged
If CHKDSK fails and TestDisk does not find your partition — or if the drive is making unusual sounds or frequently disconnecting — attempting further repair risks causing additional damage. In these cases, recovering files takes priority over repairing the drive.
Data recovery software can read the raw sectors of a corrupted drive and extract files directly, without needing a working file system. This works even on RAW drives where CHKDSK and TestDisk cannot help.
Signs that you should recover before repairing:
- Drive frequently disappears from File Explorer mid-session
- SMART data shows rising bad sector counts
- Drive takes unusually long to be recognized by Windows
- TestDisk finds no partition on multiple scans
🗣️ r/techsupport advice on RAW external drives: "If you have anything important on it, recover first. Repair attempts can sometimes make things worse on a drive that's already struggling. Get the data off first, then decide whether to repair or replace."
Part 5. What to Do After the Drive Is Fixed
After successfully repairing the external drive, take these steps to prevent the same issue from recurring:
| Action | Purpose |
|---|---|
| Run CHKDSK scan (no /f /r) monthly | Catch new errors before they become corruption |
| Always use "Safely Remove Hardware" | Prevent mid-write file system corruption |
| Check SMART health in CrystalDiskInfo | Monitor for physical degradation |
| Create regular backups | Ensure files exist elsewhere if the drive fails again |
💡 Tip: After recovering a RAW external drive, copy everything off it to a healthy drive and consider replacing it. A drive that has gone RAW once — especially due to bad sectors — is more likely to experience the same problem again.
Part 6. Recover Files From a Corrupted External Drive With Ritridata
If the drive is too corrupted for CHKDSK or TestDisk to fix, Ritridata can scan the raw sectors of the external drive and recover files directly — no working file system required. It supports formatted, RAW, and corrupted external drives on both Windows and Mac.
Step 1 — Select the corrupted external drive from the list of available drives
Step 2 — Run a safe scan — read-only, the drive is not modified during the process
Step 3 — Preview your recovered files and save them to a healthy, separate drive
FAQ
Why does my external hard drive show as RAW? RAW indicates Windows cannot recognize the file system on the drive. This typically occurs after unsafe ejection, a power interruption during a write operation, bad sectors affecting the file system area, or virus damage to the partition table.
Can I fix a RAW external hard drive without formatting? Often, yes — using CHKDSK or TestDisk. CHKDSK can fix logical file system errors; TestDisk can rebuild a corrupted partition table. However, if the drive has physical damage or the file system is completely unrecognizable, recovery before formatting may be the only option to retrieve files.
Will CHKDSK fix a RAW external hard drive? CHKDSK cannot repair a fully RAW drive — it requires a recognizable file system to work with. If CHKDSK reports "The type of the file system is RAW," use TestDisk instead, or run data recovery software to extract files before attempting any format.
What causes an external hard drive to become corrupted? Common causes include: removing the drive without using Safely Remove Hardware, power failure during a write, bad sectors in the file system area, file system corruption from an interrupted format, and in some cases malware.
Is it safe to use an external hard drive that was previously RAW? After repairing, a previously RAW drive may be usable, but the underlying cause (bad sectors, physical wear) may still be present. Running a SMART check with CrystalDiskInfo after repair helps assess whether continued use is safe.
Can TestDisk recover files from an external drive? TestDisk's companion tool PhotoRec is designed for file recovery from corrupted drives. TestDisk itself focuses on partition table repair. Using both together — TestDisk to repair, PhotoRec to recover remaining files — provides the most complete free recovery option.