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How to Rebuild and Repair Partition Table

Updated on Aug 11, 2019 by Daisy to Partition Recovery Software

Summary:
When the partition table corrupted or damaged, the hard drive will show as unallocated or not initialized in Disk Management. On this page, you'll learn to repair or rebuild partition datable without losing data by using automated EaseUS partition recovery software and manual method.
A partition table is described as a table maintained on disk by the OS, describing the partitions on that disk. The terms of partition table and partition map are most commonly associated with the MBR partition table of a Master Boot Record. It also usually refers to other formats that divide a disk into partitions, including GPT (GUID Partition Table), APM (Apple partition map) and BSD disklabel.
- From Wikipedia

Partition Table Corrupted

With the partition table, the computer can detect the existing hard drive and users can create, resize, delete partitions on the disk. The partition table is usually created while installing an operating system on Windows, Mac computers. 

However, when the table on a disk corrupted, you can't use or access the saved data in partition anymore. However, most ordinary users don't know how to identify whether the table is corrupted or damaged on a disk. The process is also very complicated. So how to determine whether the partition table is corrupted or not? 

Mostly, when the partition table gets corrupted or damaged, the disk will show as Unallocated or Not Initialized in the Disk Management as shown below:

Disk pratition table corrupted, shows unallocated or not initialized.

The solutions towards two disk issues are different and you can follow solutions on this page to repair or rebuild the corrupted partition table without losing data.

Solution 1. Recover Partition Table - Restore Partition from Unallocated Space 

When the disk becomes unallocated, you can recover the corrupted partition table by using professional partition recovery software. EaseUS Partition Recovery can assist you effectively restore the missing partitions with saved data. The corrupted partition table will be recovered together with partitions. 

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 Windows 10 is supported

Support File Systems: FAT16/FAT32/NTFS, EXT2/EXT3.

Supported OS: Windows 10/8.1/8/7/XP/Vista.

NOTE: When the scanning process completes, you can double-click the found partitions to preview saved data on your disk. You don't have to pay before making sure this software indeed finds your lost partition and data. 

 

Step 1: Run EaseUS Partition Recovery on your PC.

Select the disk or device where you lost partition(s), click "Scan" to continue.

Select disk to scan lost partition.

Step 2: Wait for the scanning process to complete.

Let the program scan selected disk and find the lost partition(s).

Scan lost partition.

Step 3: Preview and restore lost partition(s).

Double-click on the partition which is marked as "Lost" with "Good" recoverability.

Preview lost partition

Preview the content of the lost partition. Click "OK" and click "Proceed" to start restoring the lost partition.

Select found partition to restore.

Step 4: Click "Recover Now" to finish the partition recovery process.

Note: If the program warns you that there is a conflict, back up the listed partition with essential data to an external hard drive first. Then execute the final operation to restore your lost partition.

Finish partition recovery.

Reboot the computer when the process finished and you will find everything is just what it was. If this software fails, stay calm. You can follow Phrase 2 and Phrase 3 in Solution 2 provided in the next part for help.

Solution 2.  Repair/Rebuild Partition Table - Initialize Disk, Restore Data and Recreate Partitions

If the whole disk shows as "Not Initialized" in disk management, the partition table is corrupted. To repair the corrupted partition table and restore all save data on the disk, you'll need to go through the 3 phrases as listed below:

Phrase 1 - Initialize Disk in Disk Management

  • Step 1: Right-click on "This PC/My Computer", select "Manage" and enter Disk Management.
  • Step 2: Right-click on the disk which is showing as "Not Initialized" and select "Initialize Disk".
  • Initialize Disk in Disk Management
  • Step 3: Choose the desired partition style for the selected disk - MBR or GPT, click "OK" to confirm.
  • Initialize Disk.\

Phrase 2 - Recover Restore Data from Unallocated Space

If you have saved important data on the disk, don't rush to create new partitions on the disk. Your current job is to perform hard disk data recovery and restore all saved data from the unallocated disk. 

ALL-IN-ONE data recovery software - EaseUS Data Recovery Wizard to supports to recover files from those lost partitions on unallocated disk under Windows 10/8.1/8/7/Vista/XP, etc. in only three steps:

Step 1. Select the Lost Partition

Launch EaseUS data recovery software, select the lost or deleted disk partition from which you want to recover data and click "Scan" to search for all the lost data.

select the deleted partition in the lost partition option

Step 2. Scan the Selected Lost Partition

The data recovery software scans the lost partition automatically after you click the "Scan" button.

scan the deleted partition

Step 3. Recover the Lost Partition Data

After the scan, choose what you want to recover. Click the "Filter" button to find what kind of file you want to restore. Select the wanted files and get them back by clicking the "Recover" button.

recover the wanted data from the deleted partition

Save the recovered data to another secure disk or external hard drive before making the disk work again. 

Phrase 3 - Create or Recreate Partitions on the Unallocated Disk

Now, you've come to the last phrase - creating partitions on the unallocated disk. By doing so, the partition table will be repaired by the created new tables. 

  • Step 1: Open Disk Management, locate the unallocated space on your disk.
  • Step 2: Select "New Simple Volume".
  • Partition Windows 10 free 1
  • Step 3: Enter the New Simple Volume Wizard interface, click "Next" to continue. 
  • Assign Drive Letter or Path, then set the file system as NTFS. Click "Finish" to complete the process.
  • Partition Windows 10 3
  • Repeat the process if you want to create more than one partition on the disk. Restart the PC if necessary.

After this, you can save data back to the disk partition and make use of the disk again.

Bonus Tip: Protect Hard Disk Data with Regular Backup

To sum up, on this page, we've collected two reliable solutions to help you repair or recover partition table with partition recovery software and manual method when the disk shows unallocated or not initialized in Disk Management.

In order to protect your hard disk data, we would recommend you to create regular backups of valuable data saved on your disk. Free backup software - EaseUS Todo Backup will be able to help you back up hard disk data within 3 simple steps:

  • Step 1: Launch EaseUS Todo Backup and choose "File Backup" or "Disk/Partition Backup".
  • back up data with easeus todo backup
  • Step 2: Choose essential files or hard disk partition that you want to back up. Then select a destination where you want to store the backup file.
  • Step 3: Click "Proceed" to start the data backup process.