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How to Recover Data from a Lost or Deleted Partition: Partition Recovery
By XRecovery Team  |  Updated: August 6, 2026  |  16 min read

How to Recover Data from a Lost or Deleted Partition: Partition Recovery

A drive letter that was there yesterday is gone today. Disk Management shows "Unallocated" where your D: drive used to be. Or you ran diskpart clean on the wrong disk. Partition loss is terrifying because it looks like total data annihilation — but it's actually one of the most recoverable scenarios. When a partition is deleted, only the partition table entry is removed. Your actual files remain untouched on the disk. See all 8 data loss scenarios.

Table of Contents

  1. What Happens When a Partition Is Lost or Deleted
  2. Common Causes of Partition Loss
  3. Immediate First-Aid
  4. Method 1: Check Disk Management — Missing Drive Letter
  5. Method 2: TestDisk — Recover the Partition Table
  6. Method 3: XRecovery Deep Scan — Signature-Based Recovery
  7. Special Scenarios — Multiple Lost Partitions, Ghost Errors, External Drives
  8. Frequently Asked Questions
Before: Healthy Disk with Partitions After: Partition Deleted C: (Windows) NTFS · 256 GB D: (Data) NTFS · 744 GB Partition entry deleted from table C: (Windows) NTFS · 256 GB Unallocated 744 GB · Data intact! The partition table entry is gone — but every byte of your data is still on the disk Recovery: either restore the partition table entry (TestDisk) or scan unallocated space directly (XRecovery Deep Scan) Critical: Do NOT create a new partition on the unallocated space — this overwrites the old file system structures
Figure 1: What happens when a partition is deleted — the entry is removed, data remains intact in unallocated space

Common Causes of Partition Loss

CauseFrequencyTypical Scenario
diskpart clean / delete partitionCommonUsed diskpart commands on wrong disk number. Clean removes all partitions instantly.
Power failure during disk operationsCommonPower outage while writing to partition table corrupted the MBR/GPT.
Failed MBR→GPT conversionModerateUsed mbr2gpt or third-party tool — conversion failed mid-process.
Third-party partitioning tool errorModeratePartition resize/move operation crashed, leaving partition table in an inconsistent state.
Windows reinstall / ResetModerateDuring OS reinstall, accidentally deleted non-system partitions.
Virus / MalwareOccasionalMalware deliberately damaged partition table. See virus recovery guide.
Ghost / disk imaging errorOccasionalDisk imaging restored to wrong disk, overwriting partition table.

Immediate First-Aid

Critical — Do NOT make it worse.

  1. Do NOT create a new partition on the unallocated space. Creating a new partition writes a new file system structure that overwrites the old one — destroying recoverable data.
  2. Do NOT format the unallocated area. Ever.
  3. Do NOT use "New Simple Volume" in Disk Management on the unallocated space.
  4. Stop using the disk immediately. Do not save files to other partitions on the same physical disk if possible.

1 Check Disk Management — Missing Drive Letter ~1 Min

Sometimes the partition isn't actually lost — it just lost its drive letter. This is the simplest fix.

  1. Right-click Start → Disk Management.
  2. Look for a partition without a drive letter but with a recognized file system (NTFS, FAT32).
  3. Right-click it → "Change Drive Letter and Paths" → Add → assign a drive letter.
  4. Partition reappears in File Explorer with all files intact. Identify your device type for specific instructions.

2 TestDisk — Recover the Partition Table Free & Open Source

TestDisk is the gold standard for partition recovery. It scans the disk for remnants of the old partition structure and can rewrite the partition table — making all files immediately accessible without scanning.

  1. Download TestDisk (free, open source). Extract and run as Administrator.
  2. Select the disk with lost partitions → choose partition table type (Intel for MBR, EFI GPT for modern systems).
  3. Select "Analyze" → "Quick Search." TestDisk scans for partition signatures.
  4. When TestDisk finds your lost partition, press "P" to preview files inside — verify it's the right partition.
  5. Press "Write" to save the recovered partition table. Restart. Your partition returns.
Always recover data with XRecovery first before writing changes to the partition table. If TestDisk writes incorrect data, you could lose access. XRecovery is read-only and risk-free.

3 XRecovery Deep Scan — Signature-Based Recovery Most Reliable

When TestDisk can't find the partition, or when the file system inside the lost partition was also damaged, XRecovery's Deep Scan reads the unallocated space directly. It finds files by their byte signatures — completely independent of the partition table. Supports 1000+ file types.

  1. Download XRecovery to a DIFFERENT physical drive.
  2. Select the physical disk (not a partition) in XRecovery — it will show "Unallocated" space.
  3. Run Deep Scan. This searches every sector of the unallocated space for file signatures.
  4. Preview found files, then recover to a different drive. Detailed tutorial.

Hard drive recovery guide · HDD recovery software · HDD structure guide

Special Scenarios

Multiple Lost Partitions

If ALL partitions are lost (disk shows entirely unallocated), the MBR or GPT header is damaged. TestDisk's "Deeper Search" can find all partitions. For severely damaged headers, XRecovery Deep Scan on the entire physical disk is the safest approach. If the disk has bad sectors, see damaged drive guide.

Ghost / Disk Imaging Errors

If disk imaging software wrote an image to the wrong disk — overwriting the partition table — TestDisk's "Deeper Search" can often find the original partitions underneath. The original data area was untouched; only the first sectors were overwritten.

Prevention

  1. Back up your partition table. Use diskpart: list disk → select disk X → detail disk — screenshot the partition layout.
  2. Double-check disk numbers before running diskpart or formatting tools.
  3. Use a UPS to prevent power loss during disk operations.
  4. Disconnect non-essential drives before Windows reinstallation.

Partition Disappeared? Your Data Is Still There.

XRecovery Deep Scan recovers files from unallocated space. Free preview.

Download XRecovery Free

Frequently Asked Questions

Can data be recovered from a deleted partition?

Yes — partition deletion removes the table entry, not your data. Recovery success: 85-95% if no new data written to unallocated space. XRecovery free scan.

What's the difference between a lost partition and RAW drive?

Lost = Unallocated space (partition entry gone). RAW = partition exists but file system corrupted. See RAW device recovery guide.

Can TestDisk always recover lost partitions?

TestDisk works best when the old partition structure is partially intact. If the partition was overwritten by a new one, XRecovery Deep Scan is more reliable. Download XRecovery.

Is it safe to create a new partition after recovery?

Yes — after you've recovered all data (and verified it), you can safely create a new partition and format it. The old data is already saved elsewhere.

Lost Your D: Drive? Don't Create a New Partition.

Recover files first with XRecovery. Free preview — risk-free read-only scan.

Download XRecovery Free