As a server administrator, one of the most important things you need to know is the size of your server's hard drive bay. Without this information, you won't be able to select the correct hard drive or drive carrier for your server.
To get started, you'll need to press the release button on your server and open the release handle. This will allow you to slide the hard drive with its drive carrier out of the server. Once you have the hard drive in hand, you can measure it to determine whether it is a 2.5-inch or 3.5-inch drive.