diff --git a/lib/imagereader/d64imagereader.cc b/lib/imagereader/d64imagereader.cc
index ee29780c..068f0d95 100644
--- a/lib/imagereader/d64imagereader.cc
+++ b/lib/imagereader/d64imagereader.cc
@@ -5,6 +5,7 @@
 #include "fmt/format.h"
 #include "image.h"
 #include "logger.h"
+#include "mapper.h"
 #include "proto.h"
 #include <algorithm>
 #include <iostream>
@@ -55,7 +56,7 @@ public:
         for (int track = 0; track < 40; track++)
         {
             int numSectors = sectorsPerTrack(track);
-            int physicalTrack = track * 2;
+            int physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
             for (int head = 0; head < numHeads; head++)
             {
                 for (int sectorId = 0; sectorId < numSectors; sectorId++)
diff --git a/lib/imagereader/d88imagereader.cc b/lib/imagereader/d88imagereader.cc
index 18d5d373..a27a762d 100644
--- a/lib/imagereader/d88imagereader.cc
+++ b/lib/imagereader/d88imagereader.cc
@@ -5,6 +5,7 @@
 #include "image.h"
 #include "proto.h"
 #include "logger.h"
+#include "mapper.h"
 #include "lib/config.pb.h"
 #include "fmt/format.h"
 #include <algorithm>
@@ -62,21 +63,23 @@ public:
             Logger() << "D88: overriding configured format";
 
         auto ibm = config.mutable_encoder()->mutable_ibm();
-        int physicalStep = 1;
         int clockRate = 500;
         if (mediaFlag == 0x20)
         {
             Logger() << "D88: high density mode";
 			if (!config.drive().has_drive())
 				config.mutable_drive()->set_high_density(true);
+            if (!config.has_tpi())
+                config.set_tpi(96);
         }
         else
         {
             Logger() << "D88: single/double density mode";
-            physicalStep = 2;
             clockRate = 300;
 			if (!config.drive().has_drive())
 				config.mutable_drive()->set_high_density(false);
+            if (!config.has_tpi())
+                config.set_tpi(48);
         }
 
         std::unique_ptr<Image> image(new Image);
@@ -146,7 +149,7 @@ public:
                     trackSectorSize = sectorSize;
                     // this is the first sector we've read, use it settings for
                     // per-track data
-                    trackdata->set_track(track * physicalStep);
+                    trackdata->set_track(track);
                     trackdata->set_head(head);
                     trackdata->set_sector_size(sectorSize);
                     trackdata->set_use_fm(fm);
@@ -176,11 +179,10 @@ public:
                 }
                 Bytes data(sectorSize);
                 inputFile.read((char*)data.begin(), data.size());
-                const auto& sector =
-                    image->put(track * physicalStep, head, sectorId);
+                const auto& sector = image->put(track, head, sectorId);
                 sector->status = Sector::OK;
                 sector->logicalTrack = track;
-                sector->physicalTrack = track * physicalStep;
+                sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
                 sector->logicalSide = sector->physicalHead = head;
                 sector->logicalSector = sectorId;
                 sector->data = data;
@@ -188,7 +190,7 @@ public:
                 sectors->add_sector(sectorId);
             }
 
-            if (physicalStep == 2)
+            if (mediaFlag != 0x20)
             {
                 auto trackdata = ibm->add_trackdata();
                 trackdata->set_clock_rate_khz(clockRate);
diff --git a/lib/imagereader/dimimagereader.cc b/lib/imagereader/dimimagereader.cc
index 06a01550..5927ca7a 100644
--- a/lib/imagereader/dimimagereader.cc
+++ b/lib/imagereader/dimimagereader.cc
@@ -4,6 +4,7 @@
 #include "imagereader/imagereader.h"
 #include "image.h"
 #include "logger.h"
+#include "mapper.h"
 #include "proto.h"
 #include "lib/config.pb.h"
 #include "fmt/format.h"
@@ -71,7 +72,6 @@ public:
         {
             if (inputFile.eof())
                 break;
-            int physicalTrack = track;
 
             for (int side = 0; side < 2; side++)
             {
@@ -84,11 +84,10 @@ public:
                     Bytes data(sectorSize);
                     inputFile.read((char*)data.begin(), data.size());
 
-                    const auto& sector =
-                        image->put(physicalTrack, side, sectorId);
+                    const auto& sector = image->put(track, side, sectorId);
                     sector->status = Sector::OK;
                     sector->logicalTrack = track;
-                    sector->physicalTrack = physicalTrack;
+                    sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
                     sector->logicalSide = sector->physicalHead = side;
                     sector->logicalSector = sectorId;
                     sector->data = data;
diff --git a/lib/imagereader/diskcopyimagereader.cc b/lib/imagereader/diskcopyimagereader.cc
index 19f883b8..2ecfc371 100644
--- a/lib/imagereader/diskcopyimagereader.cc
+++ b/lib/imagereader/diskcopyimagereader.cc
@@ -4,6 +4,7 @@
 #include "imagereader/imagereader.h"
 #include "image.h"
 #include "logger.h"
+#include "mapper.h"
 #include "lib/config.pb.h"
 #include "fmt/format.h"
 #include <algorithm>
@@ -109,7 +110,8 @@ public:
 
                     const auto& sector = image->put(track, head, sectorId);
                     sector->status = Sector::OK;
-                    sector->logicalTrack = sector->physicalTrack = track;
+                    sector->logicalTrack = track;
+                    sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
                     sector->logicalSide = sector->physicalHead = head;
                     sector->logicalSector = sectorId;
                     sector->data.writer().append(payload).append(tag);
diff --git a/lib/imagereader/fdiimagereader.cc b/lib/imagereader/fdiimagereader.cc
index 27b43a92..6e322ce5 100644
--- a/lib/imagereader/fdiimagereader.cc
+++ b/lib/imagereader/fdiimagereader.cc
@@ -5,6 +5,7 @@
 #include "image.h"
 #include "proto.h"
 #include "logger.h"
+#include "mapper.h"
 #include "lib/config.pb.h"
 #include "fmt/format.h"
 #include <algorithm>
@@ -50,7 +51,6 @@ public:
         {
             if (inputFile.eof())
                 break;
-            int physicalTrack = track;
 
             for (int side = 0; side < sides; side++)
             {
@@ -64,10 +64,10 @@ public:
                     inputFile.read((char*)data.begin(), data.size());
 
                     const auto& sector =
-                        image->put(physicalTrack, side, sectorId);
+                        image->put(track, side, sectorId);
                     sector->status = Sector::OK;
                     sector->logicalTrack = track;
-                    sector->physicalTrack = physicalTrack;
+                    sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
                     sector->logicalSide = sector->physicalHead = side;
                     sector->logicalSector = sectorId;
                     sector->data = data;
diff --git a/lib/imagereader/imdimagereader.cc b/lib/imagereader/imdimagereader.cc
index cf49bae4..1524eee6 100644
--- a/lib/imagereader/imdimagereader.cc
+++ b/lib/imagereader/imdimagereader.cc
@@ -5,6 +5,7 @@
 #include "image.h"
 #include "proto.h"
 #include "logger.h"
+#include "mapper.h"
 #include "lib/config.pb.h"
 #include "fmt/format.h"
 #include <algorithm>
@@ -218,7 +219,8 @@ public:
                         Error() << fmt::format("don't understand IMD disks with sector status {}", Status_Sector);
                 }       
                 sector->status = Sector::OK;
-                sector->logicalTrack = sector->physicalTrack = header.track;
+                sector->logicalTrack = header.track;
+                sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(header.track);
                 sector->logicalSide = sector->physicalHead = header.Head;
                 sector->logicalSector = (sector_map[s]);
             }
diff --git a/lib/imagereader/imgimagereader.cc b/lib/imagereader/imgimagereader.cc
index 34bb0097..da523a59 100644
--- a/lib/imagereader/imgimagereader.cc
+++ b/lib/imagereader/imgimagereader.cc
@@ -4,6 +4,7 @@
 #include "imagereader/imagereader.h"
 #include "image.h"
 #include "logger.h"
+#include "mapper.h"
 #include "lib/config.pb.h"
 #include "imginputoutpututils.h"
 #include "fmt/format.h"
@@ -47,7 +48,7 @@ public:
                 const auto& sector = image->put(track, side, sectorId);
                 sector->status = Sector::OK;
                 sector->logicalTrack = track;
-                sector->physicalTrack = track;
+                sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
                 sector->logicalSide = sector->physicalHead = side;
                 sector->logicalSector = sectorId;
                 sector->data = data;
diff --git a/lib/imagereader/jv3imagereader.cc b/lib/imagereader/jv3imagereader.cc
index 04176e6e..549a6643 100644
--- a/lib/imagereader/jv3imagereader.cc
+++ b/lib/imagereader/jv3imagereader.cc
@@ -3,6 +3,7 @@
 #include "sector.h"
 #include "imagereader/imagereader.h"
 #include "image.h"
+#include "mapper.h"
 #include "logger.h"
 #include "fmt/format.h"
 #include "lib/config.pb.h"
@@ -123,8 +124,8 @@ public:
                     const auto& sector =
                         image->put(header.track, head, header.sector);
                     sector->status = Sector::OK;
-                    sector->logicalTrack = sector->physicalTrack =
-                        header.track;
+                    sector->logicalTrack = header.track;
+                    sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(header.track);
                     sector->logicalSide = sector->physicalHead = head;
                     sector->logicalSector = header.sector;
                     sector->data = data;
diff --git a/lib/imagereader/nfdimagereader.cc b/lib/imagereader/nfdimagereader.cc
index 14a97130..df51bbcb 100644
--- a/lib/imagereader/nfdimagereader.cc
+++ b/lib/imagereader/nfdimagereader.cc
@@ -5,6 +5,7 @@
 #include "image.h"
 #include "proto.h"
 #include "logger.h"
+#include "mapper.h"
 #include "lib/config.pb.h"
 #include "fmt/format.h"
 #include <algorithm>
@@ -142,7 +143,7 @@ public:
                 const auto& sector = image->put(track, head, sectorId);
                 sector->status = Sector::OK;
                 sector->logicalTrack = track;
-                sector->physicalTrack = track;
+                sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
                 sector->logicalSide = sector->physicalHead = head;
                 sector->logicalSector = sectorId;
                 sector->data = data;
diff --git a/lib/imagereader/nsiimagereader.cc b/lib/imagereader/nsiimagereader.cc
index 2f2f74cb..8693e600 100644
--- a/lib/imagereader/nsiimagereader.cc
+++ b/lib/imagereader/nsiimagereader.cc
@@ -7,6 +7,7 @@
 #include "image.h"
 #include "fmt/format.h"
 #include "logger.h"
+#include "mapper.h"
 #include "lib/imagereader/imagereader.pb.h"
 #include <algorithm>
 #include <iostream>
@@ -99,7 +100,8 @@ public:
 
                     const auto& sector = image->put(track, head, sectorId);
                     sector->status = Sector::OK;
-                    sector->logicalTrack = sector->physicalTrack = track;
+                    sector->logicalTrack = track;
+                    sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
                     sector->logicalSide = sector->physicalHead = head;
                     sector->logicalSector = sectorId;
                     sector->data = data;
diff --git a/lib/imagereader/td0imagereader.cc b/lib/imagereader/td0imagereader.cc
index dcb81bdc..9d00a675 100644
--- a/lib/imagereader/td0imagereader.cc
+++ b/lib/imagereader/td0imagereader.cc
@@ -5,6 +5,7 @@
 #include "image.h"
 #include "crc.h"
 #include "logger.h"
+#include "mapper.h"
 #include "fmt/format.h"
 #include "lib/config.pb.h"
 #include "fmt/format.h"
diff --git a/lib/mapper.cc b/lib/mapper.cc
index b2dfc8b1..384fe726 100644
--- a/lib/mapper.cc
+++ b/lib/mapper.cc
@@ -111,23 +111,27 @@ unsigned Mapper::remapTrackPhysicalToLogical(unsigned ptrack)
            config.drive().head_width();
 }
 
-unsigned Mapper::remapTrackLogicalToPhysical(unsigned ltrack)
+static unsigned getTrackStep()
 {
-	Error() << "not working yet";
-    return config.drive().head_bias() + ltrack * config.drive().head_width();
-}
-
-std::set<Location> Mapper::computeLocations()
-{
-    std::set<Location> locations;
-
     unsigned track_step =
 		(config.tpi() == 0) ? 1 : (config.drive().tpi() / config.tpi());
 
     if (track_step == 0)
         Error()
             << "this drive can't write this image, because the head is too big";
+    return track_step;
+}
 
+unsigned Mapper::remapTrackLogicalToPhysical(unsigned ltrack)
+{
+    return config.drive().head_bias() + ltrack*getTrackStep();
+}
+
+std::set<Location> Mapper::computeLocations()
+{
+    std::set<Location> locations;
+
+    unsigned track_step = getTrackStep();
     for (unsigned logicalTrack : iterate(config.tracks()))
     {
         for (unsigned head : iterate(config.heads()))