POSIX: Implement GetPhysicalDiskInfo

        public override Dictionary<string, string> GetPhysicalDiskInfo(string path, bool sizeStatsOnly)
        {
            // TODO(POSIX): Collect disk information
            Dictionary<string, string> result = new Dictionary<string, string>();
            result.Add("GetPhysicalDiskInfo", "Not yet implemented on POSIX");
            return result;
        }

Start from the POSIX override of GetPhysicalDiskInfo shown in the issue and trace its base declaration and callers to determine the expected dictionary contents and sizeStatsOnly behavior. Identify the POSIX mechanism for collecting physical disk information; the work is done when the placeholder result is replaced with real information and existing callers receive the expected data.