Initialize Disk - PowerShell


Initialize-Disk prepares a new or existing disk for use in Windows. It creates a partition table, assigns a drive letter, and formats the disk with the specified file system. This command is essential for making new disks accessible and usable within the operating system.


Initialize-Disk [-DiskNumber] <Int32[]> -PartitionStyle <String> [[-PassThru] [-PartitionSize] <UInt64>] [[-Force] [-SkipOEMPartition] [<CommonParameters>]]


| Option | Description | Default |
| -DiskNumber | Specifies the disk(s) to initialize. | |
| -PartitionStyle | Defines the partition table style to use: MBR (Master Boot Record) or GPT (GUID Partition Table). | MBR |
| -PassThru | Returns the initialized disk(s) as objects. | False |
| -PartitionSize | Sets the size of the primary partition in bytes. | |
| -Force | Overwrites any existing partitions on the disk without prompting for confirmation. | False |
| -SkipOEMPartition | Ignores the presence of an OEM partition and initializes the disk from the first sector. | False |


Example 1: Initialize a new disk with MBR partition table

Initialize-Disk -DiskNumber 2 -PartitionStyle MBR

Example 2: Initialize an existing disk with GPT partition table and create a 100GB partition

Initialize-Disk -DiskNumber 1 -PartitionStyle GPT -PartitionSize 100GB

Example 3: Initialize a disk and assign the drive letter E:

Initialize-Disk -DiskNumber 3 -PartitionStyle MBR -PassThru | Set-Partition -DriveLetter E

Common Issues

  • Error: “The disk is already initialized.” Ensure that the selected disk is not already initialized and does not contain any partitions. Use the Get-Disk command to check the disk’s status.
  • Error: “Insufficient space on the disk.” Make sure the specified -PartitionSize does not exceed the available disk space.


Initialize-Disk is commonly used with other disk management commands, such as New-Partition, Format-Volume, and Set-Partition. It can be integrated into scripts or automated processes to prepare multiple disks for use in a consistent and efficient manner.

  • Get-Disk
  • New-Partition
  • Format-Volume
  • Set-Partition