diff --git a/source/Cosmos.HAL2/BlockDevice/AHCI.cs b/source/Cosmos.HAL2/BlockDevice/AHCI.cs
index 3c3200d6a..e83851450 100644
--- a/source/Cosmos.HAL2/BlockDevice/AHCI.cs
+++ b/source/Cosmos.HAL2/BlockDevice/AHCI.cs
@@ -259,7 +259,9 @@ namespace Cosmos.HAL.BlockDevice
             if (xDET != DeviceDetectionStatus.DeviceDetectedWithPhy)
                 return PortType.Nothing;
 
-            switch ((AHCISignature)xSignature >> 16)
+            xSignature >>= 16;
+            
+            switch ((AHCISignature)xSignature)
             {
                 case AHCISignature.SATA: return PortType.SATA;
                 case AHCISignature.SATAPI: return PortType.SATAPI;