diff --git a/src/context.h b/src/context.h
index 22129a92..4e3b5d07 100644
--- a/src/context.h
+++ b/src/context.h
@@ -101,7 +101,9 @@ typedef struct nwipe_context_t_
     char device_name_without_path[100];
     char gui_device_name[100];
     unsigned long long device_size;  // The device size in bytes.
-    u64 device_size_in_sectors;  // The device size in sectors
+    u64 device_size_in_sectors;  // The device size in number of logical sectors, this may be 512 or 4096 sectors
+    u64 device_size_in_512byte_sectors;  // The device size in number of 512byte sectors, irrespective of logical sector
+                                         // size reported by libata
     unsigned long long bytes_erased;  // Irrespective of pass, this how much of the drive has been erased, CANNOT be
                                       // greater than device_size.
     char* device_size_text;  // The device size in a more (human)readable format.
diff --git a/src/device.c b/src/device.c
index 904492a9..6e4f0dda 100644
--- a/src/device.c
+++ b/src/device.c
@@ -231,6 +231,7 @@ int check_device( nwipe_context_t*** c, PedDevice* dev, int dcount )
     next_device->device_size = dev->length * dev->sector_size;
     next_device->device_sector_size = dev->sector_size;
     next_device->device_size_in_sectors = next_device->device_size / next_device->device_sector_size;
+    next_device->device_size_in_512byte_sectors = next_device->device_size / 512;
     Determine_C_B_nomenclature( next_device->device_size, next_device->device_size_txt, NWIPE_DEVICE_SIZE_TXT_LENGTH );
     next_device->device_size_text = next_device->device_size_txt;
     next_device->result = -2;
diff --git a/src/hpa_dco.c b/src/hpa_dco.c
index 78e2972a..da959a4b 100644
--- a/src/hpa_dco.c
+++ b/src/hpa_dco.c
@@ -465,8 +465,10 @@ int hpa_dco_status( nwipe_context_t* ptr )
             }
 
             nwipe_log( NWIPE_LOG_INFO,
-                       "libata: apparent max sectors reported as %lli on %s",
+                       "libata: apparent max sectors reported as %lli with sector size as %i/%i on %s",
                        c->device_size_in_sectors,
+                       c->device_block_size,
+                       c->device_sector_size,
                        c->device_name );
 
             /* close */
@@ -553,8 +555,8 @@ int hpa_dco_status( nwipe_context_t* ptr )
 #endif
 
     /* If any of the HPA or DCO values are larger than the apparent size then HPA is enabled. */
-    if( /*c->HPA_reported_set > c->device_size_in_sectors || */ c->HPA_reported_real > c->device_size_in_sectors
-        || c->DCO_reported_real_max_sectors > c->device_size_in_sectors )
+    if( /*c->HPA_reported_set > c->device_size_in_sectors || */ c->HPA_reported_real > c->device_size_in_512byte_sectors
+        || c->DCO_reported_real_max_sectors > c->device_size_in_512byte_sectors )
     {
         c->HPA_status = HPA_ENABLED;
         nwipe_log( NWIPE_LOG_WARNING, " *********************************" );
@@ -602,7 +604,7 @@ int hpa_dco_status( nwipe_context_t* ptr )
         /* If the DCO is reporting a real max sectors > the apparent size
          * as reported by libata then that is what we will use as the real disc size
          */
-        if( c->DCO_reported_real_max_size > c->device_size_in_sectors )
+        if( c->DCO_reported_real_max_size > c->device_size_in_512byte_sectors )
         {
             c->Calculated_real_max_size_in_bytes = c->DCO_reported_real_max_sectors * c->device_sector_size;
         }
@@ -612,13 +614,13 @@ int hpa_dco_status( nwipe_context_t* ptr )
              * is the value we need, however if that is zero, then c->HPA_reported_set and if that is zero then
              * c->device_size as reported by libata
              */
-            if( c->HPA_reported_real > c->device_size_in_sectors )
+            if( c->HPA_reported_real > c->device_size_in_512byte_sectors )
             {
                 c->Calculated_real_max_size_in_bytes = c->HPA_reported_real * c->device_sector_size;
             }
             else
             {
-                if( c->HPA_reported_set > c->device_size_in_sectors )
+                if( c->HPA_reported_set > c->device_size_in_512byte_sectors )
                 {
                     c->Calculated_real_max_size_in_bytes = c->HPA_reported_set * c->device_sector_size;
                 }
@@ -674,6 +676,7 @@ int hpa_dco_status( nwipe_context_t* ptr )
                "c->DCO_reported_real_max_size=%lli, c->DCO_reported_real_max_sectors=%lli, c->HPA_sectors=%lli, "
                "c->HPA_reported_set=%lli, c->HPA_reported_real=%lli, c->device_type=%i, "
                "libata:c->device_size_in_sectors=%lli ",
+               "libata:c->device_size_in_512byte_sectors=%lli ",
                c->Calculated_real_max_size_in_bytes,
                c->device_size,
                c->device_sector_size,
@@ -683,7 +686,8 @@ int hpa_dco_status( nwipe_context_t* ptr )
                c->HPA_reported_set,
                c->HPA_reported_real,
                c->device_type,
-               c->device_size_in_sectors );
+               c->device_size_in_sectors,
+               c->device_size_in_512byte_sectors );
 
     return set_return_value;
 }
diff --git a/src/version.c b/src/version.c
index 48b33692..06749fdf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -4,7 +4,7 @@
  * used by configure to dynamically assign those values
  * to documentation files.
  */
-const char* version_string = "0.35.5";
+const char* version_string = "0.35.6";
 const char* program_name = "nwipe";
 const char* author_name = "Martijn van Brummelen";
 const char* email_address = "git@brumit.nl";
@@ -14,4 +14,4 @@ Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>\n\
 This is free software; see the source for copying conditions.\n\
 There is NO warranty; not even for MERCHANTABILITY or FITNESS\n\
 FOR A PARTICULAR PURPOSE.\n";
-const char* banner = "nwipe 0.35.5";
+const char* banner = "nwipe 0.35.6";