So you just installed you Windows Server Core and you want to identify your disk drives. Or maybe you’ve plugged a USB disk to copy some files and you don’t know the drive letter.
Since there is no explorer in Server Core you will have to use diskpart. Diskpart is a utility to manage disk drives and has been available since Windows Vista and replaced the old fdisk. You’ve surely used diskpart in it’s GUI version of Disk Management, so now you just have to get used to it in a command line.
So to find out your disk drive letter in Windows Server Core just type diskpart and then list volume. This will give a list of disks and their drive letters.
To leave diskpart just type exit. If you want to discover more about diskpart type help.