Attach extra disk to VM in Azure Portal

 On cloud, In future if you need extra disk for your VM then you can do it very easily in Azure portal. follow the below steps.

• Open VM in Azure portal.
• Goto Settings > Disks
• Click on 'Create and attach a new disk'
• provide disk information and click on Save button.

new disk will be created and It will update the existing VM.

• Now take RDP of your Virtual machine. 
• Goto Server Manager\File and Storage Services\Volumes\Disks 

here you will see all your disk. select the newly created disk.

• Right click on newly created disk. a context menu will be open. select new volume.

It will open a dialog window. follow the steps and click on OK. Now check in my computer. you will see new drive.