diff --git a/Hardware/HDD/SSDPlextor.cs b/Hardware/HDD/SSDPlextor.cs
index c5b382b..02ed57c 100644
--- a/Hardware/HDD/SSDPlextor.cs
+++ b/Hardware/HDD/SSDPlextor.cs
@@ -10,6 +10,7 @@
 
 namespace OpenHardwareMonitor.Hardware.HDD {
   using System.Collections.Generic;
+  using OpenHardwareMonitor.Collections;
 
   [NamePrefix("PLEXTOR")]
   internal class SSDPlextor : AbstractHarddrive {
@@ -18,10 +19,20 @@ namespace OpenHardwareMonitor.Hardware.HDD {
       new List<SmartAttribute> {
       new SmartAttribute(0x09, SmartNames.PowerOnHours, RawToInt),
       new SmartAttribute(0x0C, SmartNames.PowerCycleCount, RawToInt),
+      new SmartAttribute(0xF1, SmartNames.HostWrites, RawToGb, SensorType.Data, 
+        0, SmartNames.HostWrites),
+      new SmartAttribute(0xF2, SmartNames.HostReads, RawToGb, SensorType.Data, 
+        1, SmartNames.HostReads),
     };
 
     public SSDPlextor(ISmart smart, string name, string firmwareRevision, 
       int index, ISettings settings)
       : base(smart, name, firmwareRevision, index, smartAttributes, settings) {}
+
+    private static float RawToGb(byte[] rawvalue, byte value,
+      IReadOnlyArray<IParameter> parameters) 
+    {
+      return RawToInt(rawvalue, value, parameters) / 32;
+    }
   }
 }
diff --git a/Hardware/HDD/SSDSamsung.cs b/Hardware/HDD/SSDSamsung.cs
index b19bf2f..b260079 100644
--- a/Hardware/HDD/SSDSamsung.cs
+++ b/Hardware/HDD/SSDSamsung.cs
@@ -50,7 +50,10 @@ namespace OpenHardwareMonitor.Hardware.HDD {
       new SmartAttribute(0xC9, SmartNames.SupercapStatus),
       new SmartAttribute(0xCA, SmartNames.ExceptionModeStatus),
       new SmartAttribute(0xEB, SmartNames.PowerRecoveryCount),
-      new SmartAttribute(0xF1, SmartNames.TotalLBAWritten)
+      new SmartAttribute(0xF1, SmartNames.TotalLBAWritten, 
+        (byte[] r, byte v, IReadOnlyArray<IParameter> p)
+          => { return RawToInt(r, v, p) * 512 / 1024 / 1024 / 1024; },
+        SensorType.Data, 0, SmartNames.TotalLBAWritten)
     };
 
     public SSDSamsung(ISmart smart, string name, string firmwareRevision,