diff --git a/src/drive_handle.py b/src/drive_handle.py
index 28e2672224d05d07b211596f0d3d2c662f03e924..3ba65a5c266066e1df64ea66031786f74d4511cc 100644
--- a/src/drive_handle.py
+++ b/src/drive_handle.py
@@ -157,7 +157,7 @@ class DriveHandle:
         progressbar = Spinner('[DriveHandle] Writing the pattern file')
         with open(path, "wb") as file_descriptor:
             while os.path.getsize(path) + cluster_size < self.get_free_drive_space():
-                current_pattern_symbol : chr = chr(ord(pattern_start_symbol) + iteration)
+                current_pattern_symbol: chr = chr(ord(pattern_start_symbol) + iteration)
                 file_descriptor.write(current_pattern_symbol.encode() * cluster_size)
                 iteration = (iteration + 1) % 26
                 progressbar.next()
diff --git a/src/tests/slack_test.py b/src/tests/slack_test.py
index 370d4930c5d98aadd2ba4afd62ee35af503e9384..e58429d44d96398f719c6e146c4123fae21b9c02 100644
--- a/src/tests/slack_test.py
+++ b/src/tests/slack_test.py
@@ -12,11 +12,11 @@ class SlackTest(DecisionTest):
     @property
     def WEIGHT(self):
         return 2
-    
+
     def __init__(self, drive_handle: DriveHandle, check_cluster_overlap: bool) -> None:
         self._drive_handle = drive_handle
         self._check_cluster_overlap = check_cluster_overlap
-    
+
     def determine_probability(self) -> bool:
         """
         Determines wether the drive abstracted by the DriveHandle uses SSD technology
@@ -58,19 +58,19 @@ class SlackTest(DecisionTest):
                 print(colored("[SlackTest] The last cluster of the overwrite file is disjoint with these of the pattern file.", "red"))
                 # If both clusters are not part, this test is useless
                 raise RuntimeError("SlackTest could not be performed.")
-        
+
         # analyse the slack space
         (sector_size, sectors_per_cluster, _) = self._drive_handle.get_allocation_unit_sizes()
 
         half_cluster: int = sector_size * (sectors_per_cluster // 2)
         print("[SlackTest] Showing the RAM slack:")
-        print(colored(overwrite_file_last_cluster[half_cluster:half_cluster+(sector_size//2)].hex(' ', 1), "light_grey"), end=' ')
-        print(colored(overwrite_file_last_cluster[half_cluster+(sector_size//2):half_cluster+sector_size].hex(' ', 1), 'green'))
+        print(colored(overwrite_file_last_cluster[half_cluster:half_cluster + (sector_size // 2)].hex(' ', 1), "light_grey"), end=' ')
+        print(colored(overwrite_file_last_cluster[half_cluster + (sector_size // 2):half_cluster + sector_size].hex(' ', 1), 'green'))
         print("[SlackTest] Showing the drive slack:")
-        print(colored(overwrite_file_last_cluster[half_cluster+sector_size:].hex(' ', 1),'yellow'))
-        
-        found_non_zero_byte : bool = False
-        for hex_value in overwrite_file_last_cluster[half_cluster+sector_size:].hex():
+        print(colored(overwrite_file_last_cluster[half_cluster + sector_size:].hex(' ', 1),'yellow'))
+
+        found_non_zero_byte: bool = False
+        for hex_value in overwrite_file_last_cluster[half_cluster + sector_size:].hex():
             if hex_value != '0':
                 found_non_zero_byte = True
                 break
@@ -83,7 +83,6 @@ class SlackTest(DecisionTest):
 
         print(colored("[SlackTest] Slack test completed.", "light_blue"))
         return found_non_zero_byte
-    
 
     @property
     def drive_handle(self) -> DriveHandle: