Initialize Data Storage Disk
By default, AWS doesn’t automatically initialize a second storage drive (i.e., the 300GB D drive). Perform these steps to initialize the data drive:
Connect to your EC2 instance using Remote Desktop Connection.
Open PowerShell window (press the Windows key and type powershell). Select “Windows PowerShell” in the context menu.
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Initialize the second disk.
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Initialize -Disk -Number 1 -PartitionStyle MBRCreate a new partition on the second disk.
Next (Stop your EC2 Instance)>