NTFS Repair & Data Recovery: How to Fix and Restore

Updated 6 November 2026 · Standard formula, shown below

To repair an NTFS file system and recover data, you first run a disk check utility (CHKDSK) to fix logical corruption, then use a dedicated data recovery program to restore files that CHKDSK cannot recover. This article explains how NTFS corruption happens, the step-by-step repair process, and the best approaches for data recovery before and after repair.

What Is NTFS and Why Does It Corrupt?

NTFS (New Technology File System) is the default file system for Windows since Windows NT 3.1. It supports large files, permissions, encryption, compression, and journaling, which records changes before they are committed. The journal (called $LogFile) helps the system recover from sudden power loss or crashes, but it does not guarantee protection against all corruption.

Common causes of NTFS corruption include:

Unclean shutdowns (power outages, forced restarts)
Bad sectors on the hard drive or SSD
Malware or virus infections
Improper ejection of external drives
Hardware failures (failing drive, faulty cable)
Software bugs or driver issues

When corruption occurs, Windows may show errors like “The file or directory is corrupted and unreadable,” “Access denied,” or the drive may become RAW (no file system visible).

How NTFS Repair Works

The primary tool for repairing NTFS is CHKDSK (Check Disk), a built-in Windows utility. It scans the volume for file system errors and attempts to fix them. CHKDSK works in three stages:

Stage 1: Scans the master file table (MFT) for errors in file records.
Stage 2: Checks directory entries and file names.
Stage 3: Validates the security descriptors and file data.

If you run CHKDSK with the /f flag, it will attempt to fix errors. The /r flag also locates bad sectors and recovers readable information. CHKDSK does not recover deleted files; it only repairs the file system structure.

Step-by-Step: How to Repair NTFS with CHKDSK

Before running CHKDSK, back up any important data if the drive is still accessible. If the drive is not bootable, you may need to boot from a Windows installation USB and use the Command Prompt.

Open Command Prompt as Administrator (search “cmd”, right-click, “Run as administrator”).
Type chkdsk X: /f (replace X with the drive letter).
If the drive is in use, you will be prompted to schedule the check for the next restart. Type Y and restart.
For bad sector scanning, use chkdsk X: /r instead. This may take hours on large drives.
Wait for the scan to complete. It will display a summary of what was fixed.

If CHKDSK cannot fix the errors, the drive may have physical damage. In that case, stop using the drive immediately and seek professional data recovery services.

Data Recovery Before Repair

If you have important files on a corrupted NTFS drive, do not run CHKDSK first. CHKDSK can sometimes make data recovery harder by overwriting or relocating file records. Instead, use a data recovery tool to create a disk image first, then run CHKDSK on the image or after recovering files.

Popular data recovery tools for NTFS include:

Recuva (free, user-friendly)
TestDisk (free, command-line, can rebuild the boot sector)
PhotoRec (free, companion to TestDisk, recovers raw files)
DMDE (free/paid, powerful for NTFS structures)
R-Studio (paid, professional-grade)

These tools scan the raw disk and reconstruct files from the MFT or by file signatures. They work even if the drive is RAW or unreadable in Windows.

When to Use a Professional Service

If the drive has physical damage (clicking sounds, not spinning up, or excessive bad sectors), do not attempt DIY recovery. Running software on a failing drive can worsen the damage. Professional data recovery services have cleanrooms and specialized hardware to read damaged drives. They are expensive (often hundreds to thousands of dollars), but they offer the best chance for critical data.

Signs of physical failure include:

Clicking, grinding, or beeping sounds
Drive not recognized by BIOS or Windows
Very slow read/write speeds
SMART errors (e.g., reallocated sectors, pending sectors)

Common Mistakes and Misconceptions

One common misconception is that CHKDSK can recover deleted files. It cannot. CHKDSK only repairs the file system’s metadata; it does not restore user data. Another mistake is running CHKDSK on a drive with physical damage, which can cause further data loss.

Another error people make is formatting a RAW drive immediately. Formatting creates a new file system and overwrites the old MFT, making recovery much harder. If you see a RAW drive, do not format it; use recovery software first.

Also, many users ignore the “Dirty Bit” (the volume is marked as dirty), which indicates potential corruption. Running CHKDSK promptly can prevent minor issues from becoming major.

How to Prevent Future Corruption

Prevention is better than repair. Here are some practices to reduce NTFS corruption risk:

Always use “Safely Remove Hardware” before unplugging external drives.
Use a UPS (uninterruptible power supply) for desktops to avoid power outages.
Keep your system stable with regular updates and malware scans.
Monitor SMART health of your drives with tools like CrystalDiskInfo.
Back up important data regularly to another drive or cloud.

Frequently Asked Questions

Can I recover data from a corrupted NTFS drive without software?

If the corruption is minor, you might be able to copy files to another drive via Windows Explorer. But if the drive is not accessible, you need recovery software or professional help. There is no built-in Windows tool to recover deleted or lost files.

Will CHKDSK delete my files?

CHKDSK can delete corrupted file records if it cannot repair them, but it usually moves them to a folder called “found.000” (or “found.001” etc.) as .chk files. These are orphaned file fragments that you can try to rename and recover manually. However, running CHKDSK on a failing drive can cause data loss, so always back up first.

What does “RAW” mean and how do I fix it?

RAW means Windows cannot recognize the file system on the drive. This can happen due to corruption, a damaged boot sector, or a failed partition table. You can attempt to repair it with TestDisk to rebuild the boot sector, or use recovery software to extract files. Do not format the drive unless you don’t need the data.

Can I repair NTFS on a Mac or Linux?

Mac and Linux can read NTFS but not write to it natively (macOS can read, but writing requires third-party tools). For repair, you can use the ntfsfix command on Linux, which fixes basic issues, but it is not as thorough as CHKDSK. For serious corruption, use a Windows machine or a bootable Windows USB.

How long does CHKDSK take?

The time depends on the drive size, speed, and the extent of corruption. A small healthy drive might take a few minutes, while a large, heavily corrupted drive can take several hours. If it seems stuck, wait; interrupting CHKDSK can cause more damage.

Is it safe to use a drive after CHKDSK repairs it?

If CHKDSK reports that errors were fixed and the drive works normally, it is generally safe. However, if the corruption was caused by physical damage, the drive may fail again. Check SMART status and back up important data. If errors reappear, replace the drive.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.