Quick “Hard Disk Not Initialized” Fixes inWindows 10/8/7

January 4, 2019

If your external hard drive not initialized in Disk Management, you will be unable to access the data saved on it. Here, we will tell why it occurs and bring easy yet effective hard disk not initialized fixes.

Cases study

>Case 1. I have a Seagate 2TB external hard drive used to store family photos. I was copying some new photos when my computer crashed while the process was still ongoing. After that, the hard disk was not readable/accessible and shown as “disk unknown not initialized unallocated” in the disc management.

Disk Not Initialized Unallocated

> Case 2. Whenever I plug in my external hard drive to PC, it says that it's successfully installed however I cannot see it "my computer". When I enter disk management the disk is shown as “unknown, not initialized, no size”. Is there any easy hard disk not initialized fix for computer newbies like me? I don't want to lose my data. Thanks!

Disk Not Initialized No Size

Possible causes

To find the proper hard disk not initialized fixes, firsly, you need to  figure out why it happens. In general, the possible causes behind the disk unknown not initialized (unallocated space/ no disk space) issue can be concluded as below:

>  Virus attack;

>  Corrupted Master Boot Record (MBR);

>  Partition get lost or deleted unintentionally;

>  Damaged file system structure;

Bad sectors exist on the disk;

How to fix “hard disk not initialized” issue?

As we have already known that there are two different cases about hard disk not initialized issue in Windows 10/8/7, it is necessary to take different measure accordingly. We will tell how to tackle with those two different cases in Windows 10/8/7 elaborately in the next context.

Case 1. disk unknown, not initialized, unallocated

In this case, the uninitialized disk shows as unallocated space, which means the disk has been recognized successfully by your current Windows operating system, but the partition is lost or deleted by accident, there are bad sectors on the disk or the MBR is damaged for some reasons. Then, you can try the following solutions.

Solution 1. Rebuild MBR

As we mentioned above, damaged MBR might also be a reason for hard disk not initialized issue. Therefore, you can rebuild MBR to solve this problem. For this task, you can use AOMEI Partition Assistant Standard. It is a free disk manager for Windows 10/8/7/XP/Vista.

Step 1. Free download AOMEI Partition Assistant, install and open it in Windows computer. Right click the uninitialized disk and select “Rebuild MBR”.

Rebuild MBR

Step 2. In this window, you can choose a proper MBR type for your current operating system and then click “OK”.

MBR Type

Step 3. Click “Apply” > “Proceed” to commit the pending operation.


Solution 2. Check disk error

If there are bad sectors on the disk, it might also be shown as unknown, uninitialized and unallocated space. So you also need to check whether there are some bad sectors on the disk. AOMEI Partition Assistant can help you with that, too.

Step 1. Run AOMEI Partition Assistant, right click the uninitialized disk and select “Surface Test”.

Surface Test

Step 2. Click “Start” to do the surface test.


Solution 3. Recover lost partition

If the original partition on the disk gets lost, then the disk might also suffer “not initialized, unallocated space” issue. Here you can upgrade AOMEI Partition Assistant Standard to Professional version, which allows you to recover the deleted or lost partition easily in the four steps.

Step 1. In the main interface of AOMEI Partition Assistant Pro, click “Partition Recovery Wizard” under “Wizard” column. Then a new small window will pop out, select the disk from which you want to recover lost partition and click “Next”.

Partition Recovery

Step 2. Choose a search method (Fast Search or Full Search) and click “Next”. Here we select “Fast Search”, which will quickly find out deleted and lost partitions.

Fast Search

Step 3. Tick the lost partition to recover and click “Proceed” to continue.

Select Lost Partition

Step 4. Click “Finish” after the recovery process is completed and “Congratulations” appears.


Solution 4. Initialize disk

Since initializing disk will erase all data on the disk, we list it at the end. If all the methods above do not fix your problem, you can initialize the disk in Disk Management.

Before you do: recover important data from the disk in advance since this initializing operation will result in data loss.

Step 1. Right click "My computer" and then select "Manage" to enter Disk Management.

Step 2. Locate and right click the uninitialized disk, select “Initialize Disk” and follow the wizard to initialize it as MBR or GPT disk.

Case 2. disk unknown, not initialized, no disk size

If there is no any information displayed on the disk, without disk capacity shown, there are chances that the disk is physically broken. Thus, you need to replace it with a new one or go to a professional hard drive repair center.

If it is the motherboard issue that lead to hard disk not initialized, no disk size, you can turn off PC completely (remove battery) and disconnect the disk for about 10 seconds, then insert the battery, power on computer, and finally shut down the computer again, reinsert the disk back and restart your computer.

Final words

In summary, AOMEI Partition Assistant provides the quick and easy hard disk not initialized fixes. Besides, it can also help deal with other tricky disk issues like formatting write-protected disk, repairing raw hard drive, converting dynamic disk to basic without data loss and more.