Introduction: Whether you are using Windows or Linux, you can quickly determine your free disk space from the command line interface (CLI). Requirements: Access to the Windows or Linux command line interface. Procedure: Linux: Type: df -h to retrieve detailed disk information on mounted partitions with the following six column headers: Filesystem Size Used Avail Use% Mounted on By including the -h in the command, the returned disk information will be in easily readable formats. Windows: Type: wmic logicaldisk get freespace to return available disk space. Output will appear as bytes and will look like: FreeSpace 3906949120 More Information: On Linux, type either: man df man fdisk -l On Windows, type either: wmic /? wmic logicaldisk /? wmic logicaldisk get /? wmic logicaldisk get freespace /?