Attach a managed data disk to a Windows VM by using the Azure portal
Applies to: ✔️ Windows VMs ✔️ Flexible scale sets
This article shows you how to attach a new managed data disk to a Windows virtual machine (VM) by using the Azure portal. The size of the VM determines how many data disks you can attach. For more information, see Sizes for virtual machines.
Add a data disk
- Sign in to the Azure portal.
- Search for and select Virtual machines.
- Select a virtual machine from the list.
- On the Virtual machine pane, select Disks.
- On the Disks pane, select Create and attach a new disk.
- In the drop-downs for the new disk, make the selections you want, and name the disk.
- Select Save to create and attach the new data disk to the VM.
Initialize a new data disk
- Connect to the VM.
- Select the Windows Start menu inside the running VM and enter diskmgmt.msc in the search box. The Disk Management console opens.
- Disk Management recognizes that you have a new, uninitialized disk and the Initialize Disk window appears.
- Verify the new disk is selected and then select OK to initialize it.
- The new disk appears as unallocated. Right-click anywhere on the disk and select New simple volume. The New Simple Volume Wizard window opens.
- Proceed through the wizard, keeping all of the defaults, and when you're done select Finish.
- Close Disk Management.
- A pop-up window appears notifying you that you need to format the new disk before you can use it. Select Format disk.
- In the Format new disk window, check the settings, and then select Start.
- A warning appears notifying you that formatting the disks erases all of the data. Select OK.
- When the formatting is complete, select OK.
- You can also attach a data disk by using PowerShell.
- If your application needs to use the D: drive to store data, you can change the drive letter of the Windows temporary disk.