diff --git a/kiwi_simple_metrics/metrics/disk.py b/kiwi_simple_metrics/metrics/disk.py
index cdc46b8..c30ee0c 100644
--- a/kiwi_simple_metrics/metrics/disk.py
+++ b/kiwi_simple_metrics/metrics/disk.py
@@ -8,17 +8,17 @@ def disk() -> Report | None:
     if not SETTINGS.disk.enabled:
         return None
 
-    def path_to_free_percent(path: os.PathLike) -> float:
+    def path_to_used_percent(path: os.PathLike) -> float:
         try:
             sv = os.statvfs(path)
-            return sv.f_bavail / sv.f_blocks * 100
+            return (1 - sv.f_bavail / sv.f_blocks) * 100
         except ZeroDivisionError:
             return 0
 
     data = sorted([
-        (str(path), path_to_free_percent(path))
+        (str(path), path_to_used_percent(path))
         for path in SETTINGS.disk.paths
-    ], key=lambda d: d[1])
+    ], key=lambda d: d[1], reverse=True)
 
     reports = [Report.new(
         settings=SETTINGS.disk,
diff --git a/kiwi_simple_metrics/settings.py b/kiwi_simple_metrics/settings.py
index 8011ee0..e534b97 100644
--- a/kiwi_simple_metrics/settings.py
+++ b/kiwi_simple_metrics/settings.py
@@ -1,4 +1,5 @@
 import math
+from typing import Literal
 
 from pydantic import BaseModel, DirectoryPath, Field
 from pydantic_settings import BaseSettings, SettingsConfigDict
@@ -26,18 +27,19 @@ class CpuMS(MetricSettings):
     threshold: float = math.inf
 
 
-class MemoryMS(MetricSettings):
+class MultiMS(MetricSettings):
+    # outer format string for reporting
+    report_outer: str = "{name}: [{inner}]"
+
+
+class MemoryMS(MultiMS):
     name: str = "Memory"
     threshold: float = 90
 
 
-class DiskMS(MetricSettings):
-    name: str = "Disk Free"
-    threshold: float = 15
-    inverted: bool = True
-
-    # outer format string for reporting
-    report_outer: str = "{name}: [{inner}]"
+class DiskMS(MultiMS):
+    name: str = "Disk Used"
+    threshold: float = 85
 
     # paths to check for disk space
     paths: list[DirectoryPath] = Field(default_factory=list)