diff --git a/salt/modules/disk.py b/salt/modules/disk.py
index 9f03c2b99925..a4edf05a3463 100644
--- a/salt/modules/disk.py
+++ b/salt/modules/disk.py
@@ -39,19 +39,19 @@ def _parse_numbers(text):
         return decimal.Decimal(text)
 
     try:
-        postPrefixes = {
-            "K": "10E3",
-            "M": "10E6",
-            "G": "10E9",
-            "T": "10E12",
-            "P": "10E15",
-            "E": "10E18",
-            "Z": "10E21",
-            "Y": "10E24",
+        unit_suffixes = {
+            "K": "1E3",
+            "M": "1E6",
+            "G": "1E9",
+            "T": "1E12",
+            "P": "1E15",
+            "E": "1E18",
+            "Z": "1E21",
+            "Y": "1E24",
         }
-        if text[-1] in postPrefixes.keys():
+        if text[-1] in unit_suffixes.keys():
             v = decimal.Decimal(text[:-1])
-            v = v * decimal.Decimal(postPrefixes[text[-1]])
+            v = v * decimal.Decimal(unit_suffixes[text[-1]])
             return v
         else:
             return decimal.Decimal(text)
diff --git a/tests/unit/modules/test_disk.py b/tests/unit/modules/test_disk.py
new file mode 100644
index 000000000000..7fbef3a84b0f
--- /dev/null
+++ b/tests/unit/modules/test_disk.py
@@ -0,0 +1,21 @@
+import unittest
+from salt.modules.disk import _parse_numbers
+
+class TestParseNumbers(unittest.TestCase):
+
+    def test_integer(self):
+        result = _parse_numbers("42")
+        self.assertEqual(result, decimal.Decimal("42"))
+
+    def test_with_kilo(self):
+        result = _parse_numbers("1.5K")
+        self.assertEqual(result, decimal.Decimal("1500"))
+
+    def test_with_mega(self):
+        result = _parse_numbers("2.5M")
+        self.assertEqual(result, decimal.Decimal("2500000"))
+
+    # Add more test cases for other units and scenarios
+
+if __name__ == '__main__':
+    unittest.main()