Right-click "My Computer", choose "Manage" and find "Disk Management". Your new drive should show up there. (If not, something else is wrong. Try to find it in "Device Manager".) If it really is a new drive, and hasn't been partitioned and formatted yet, it will show up in the bottom list with a black bar and the word "Unallocated". Right-click there, choose "New Partition" and you will be guided through the process of setting up a file system on the drive.
If there already is a partition set up and formatted with a valid file system (preferably NTFS but FAT32 is supported too), and it shows up on the list as "Healthy", confirm that it has a drive letter assigned. If not, you can quickly right-click and assign one.
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Right-click "My Computer", choose "Manage" and find "Disk Management". Your new drive should show up there. (If not, something else is wrong. Try to find it in "Device Manager".) If it really is a new drive, and hasn't been partitioned and formatted yet, it will show up in the bottom list with a black bar and the word "Unallocated". Right-click there, choose "New Partition" and you will be guided through the process of setting up a file system on the drive.
If there already is a partition set up and formatted with a valid file system (preferably NTFS but FAT32 is supported too), and it shows up on the list as "Healthy", confirm that it has a drive letter assigned. If not, you can quickly right-click and assign one.