Initialize HDD/SSD for Free and Fix 'Disk Unknown Not Initialized' Error

Tracy King updated on Dec 05, 2018 to Partition Manager | How-to Articles

"Hi there, do you know how to initialize a new SSD in PC? I recently bought a new SSD and I added to my computer but it won't allow me to create a new partition. It keeps asking me to initialize the disk with an error message " Disk Unknown is not initialized". How can I fix this issue?"

Why need to initialize HDD/SSD

Are you having a similar problem with your SSD or HDD that the disk drive is not responding or stay with an unallocated condition? Do you know why the system keeps asking you or forcing you to initialize HDD/SSD? Here below are the reasons and cases that you are in and why you have to initialize SSD or HDD:

  • New HDD or SSD does not show up in PC

When a brand new SSD or HDD is plugged into PC, it may not show up in This PC/Computer immediately. You have to initialize it so to make it detectable and work for storing data.

  • "Disk Unknown Not Initialized" error.

An error message such as " Disk 0 is unknown, not initialized, unallocated" may pop up if you try to open a solid state disk or hard disk drive. This problem can occur to all Windows systems including Windows 10/8/7 and the only way is to fix 'disk not initialized' error.

  • Logical Disk Manager cannot access a disk since it's not initialized.

Sometimes, if a hard disk or SSD is not initialized into MBR or GPT, the system may warn you with an error message "You must initialize a disk before Logical Disk Manager can access it".

How to fix "Disk unknown not initialized" error

If you think the above-offered methods are too complex for you to free initialize the disk, you can apply professional partition manager software - EaseUS Partition Master Free for help.

Note: Back up important data if you have stored data in the not initialized HDD or SSD.

This software allows you to initialize SSD or HDD into MBR disk within 3 simple steps:

1. Download, install and run EaseUS Partition Master Free.

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 Windows 10 is supported

How to initialize SSD/HDD in Windows 10/8/7

Note: In order to avoid unnecessary data loss error, please back up important data in the not initialized disk.

So how to initialize an SSD or HDD disk under different Windows system such as Windows 10/8 or 7? Here below you'll find recommended free methods to initialize disk without losing data now:

Method 1. Use Disk Management to initialize SSD/HDD in Windows 10/8/7

For Windows 10/8 users:

  • Press Win + R, and type: diskmgmt.msc and click OK or right-click on This PC and select Manage to open Disk Management tool.
  • Find the HDD or SSD that you need to initialize and right-click on it, select Initialize Disk.
  • Select the disk to initialize and set the disk as MBR or GPT.

After this, reboot PC to keep all changes and then your disk can be used properly.

For Windows 7 users:

  • Right-click Computer and select Manage to open Disk Management.
  • Right-click on the not initialized disk (HDD or SSD) and select Initialize Disk.
  • Select the disk(s) to initialize in the Initialize Disk dialog box and set the disk partition as MBR or GPT.

Reboot PC and then your disk will be initialized to create new partitions on it for storing new data.

Method 2. Run CMD to initialize HDD or SSD

If you have important data in your not initialized disk, please do remember to backup data into another safe disk or external storage device. CMD command may erase all data on your disk which you want to initialize.

1. Press Win+R and type: diskpart and hit "Enter".

2. Type: list disk and hit "Enter".

3. Type: select disk G and hit "Enter". (G shall be the drive letter of your not initialized disk.)

4. Type: clean and hit "Enter".

5. Type: convert gpt or convert mbr and hit "Enter".

6. Type: create partition primary and hit "Enter".

7. Type: format quick fs=ntfs and hit "Enter".

8. Type: assign and hit "Enter".

9. Type: exit and hit "Enter".

There, you've finished the disk initialize process with the above commands.


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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

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