How to Partition, Format or Wipe Hard Drive Without OS

Jean updated on Aug 29, 2019 to Partition Manager | How-to Articles

Part 1: How to Partition Hard Drive Without OS
Part 2: How to Fomart Hard Drive Without OS
Part 3: How to Wipe Hard Drive Without OS

You can easily partition, format or wipe a partition within the Windows OS. But how to make it happen if your computer has no operating system or OS fails to boot? Such problem has been resolved already. You can depend on Windows PE (Preinstallation Environment) to boot the computer. The overall process is as follows:

  • Create a bootable media, which can be an ISO file, USB flash drive or CD/DVD disc
  • Boot the non-operating-system computer from the bootable drive
  • Partition, format or wipe the hard drive for a normal usage

Create a Bootable Drive with EaseUS Bootable Partition Manager (Important)

Are you looking for a bootable partition manager that enables you to create a bootable drive? When your operating system fails to work and doesn't boot normally, a bootable drive is necessary. What's more, there is even no operating system installed on a newly bought computer. So, what's the best bootable partition manager which helps partition, format or wipe hard drive without OS easily?

EaseUS Partition Master is designed with a highlighted feature called WinPE Bootable disk. With it, you can create a bootable media including ISO file, USB flash drive, and CD/DVD. And the bootable drive can load and run the partition manager software under the system. Then you can partition, format and wipe hard drive. Now create a bootable drive by following the details below:

  • Go and find a working computer. 
  • You need to download and install the EaseUS Partition Master to accomplish the essential steps to make a bootable drive.
Download Now

 Windows 10 is supported


Step 1: Prepare a disc or drive

To create a bootable disk of EaseUS Partition Master, you should prepare a storage media, like a USB drive, flash drive or a CD/DVD disc. Correctly connect the drive to your computer.

Launch EaseUS Partition Master, go to the "WinPE Creator" feature on the top. Click on it.

create easeus partition master bootable disk

Step 2: Create EaseUS Partition Master bootable drive

You can choose the USB or CD/DVD when the drive is available. However, if you do not have a storage device at hand, you can also save the ISO file to a local drive, and later burn it to a storage media. Once made the option, click "Proceed".

create easeus partition master bootable disk

You have created an EaseUS Partition Master WinPE bootable disk now. You can manage your hard disks and partitions through the bootable drive whenever the computer fails to boot normally.

If you have RAID drives, load the RAID driver first by clicking Add Driver from the menu bar, which can help you add the driver of your device under WinPE environment, as some specific device cannot be recognized under WinPE environment without drivers installed, such as RAID or some specific hard disk.

Part 1: How to Partition Hard Drive Without OS

Insert the bootable drive in the computer without OS, set the boot order in BIOS to boot the computer from the EaseUS bootable drive. Then you can see the interface of EaseUS Partition Master. Follow the steps to partition your hard drive.


Right-click on the partition that you want to shrink and select "Resize/Move".

Split a partition - Step 1

Step 2: Shrink the partition size

To shrink a partition, use your mouse to drag one of its ends to shrink partition space.

Split a partition - Step 2

You can also adjust the partition size box to shrink the target partition.
Click "OK" to continue.

Split a partition - Step 2

Step 3: Create a new partition

Right-click on the unallocated space you get by shrinking your partition and select "Create".

Split a partition - Step 3

Step 4: Adjust the new partition size, file system, label, etc.

Set the size, partition label, drive letter, file system, etc. for the new partition and click "OK" to continue.

Split a partition - Step 4

Step 5: Apply the changes

Click on the "Execute Operation" button, check the changes, then click "Apply" to start shrinking a partition and creating a new one with the free space. By doing so, you can successfully split a partition.

Part 2: How to Format a Hard Drive Without OS

Usually, in all types of Windows operating systems, you can format a hard drive using the command prompt, the hard drive formatting tool or the Windows Explorer and Windows Disk Management. But things become difficult when you format a hard drive without OS. You can make things easier with the help of EaseUS Partition Master.

Download Now

 Windows 10 is supported

Also, insert the bootable drive (you have created it at the very first) and boot from it to enter EaseUS partition tool. Then follow the details:

Step 1: Select a partition.

Step 2: Right-click it and select "Format".

Step 3: Type the label you want in the Partition Label text box. 

Step 4: Select the file system type to be created from the Partition Type drop-down list. (FAT/FAT32, NTFS, ReFS and EXT2/EXT3). Choose the Cluster Size (512 byte,1,2,4…64KB) from drop-down list. 

Step 5: Click "OK" when ready. All the introduced changes to the disk layout will be pended until applied in Pending Operation List.

Part 3: How to Wipe Hard Drive Without OS

Wipe Data can erase all the data on the selected partition/disk/unallocated space. In most cases, the data cleaned with this feature are not able to be retrieved. 

To wipe data without OS:

Download Now

 Windows 10 is supported

Step 1: Insert the bootable drive to open EaseUS Partition Master. Select a disk/partition (volume)/unallocated space.

Step 2: Right-click it and select "Wipe Data".

Step 3: Set the number of times to wipe the partition in Wipe Disk/Partition window (The wipe algorithm is to alternately overwrite the disk by 0x00 and random digit according to the wipe times).

Step 4: Click "OK" when ready. All the introduced changes to the disk layout will be pended until applied in Pending Operation List.

Wipe Partition - Step 1

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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.

About EaseUS Partition Master

All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.