diff --git a/libraries/ESP8266SdFat b/libraries/ESP8266SdFat
index 9472c86140..3a6b688b1b 160000
--- a/libraries/ESP8266SdFat
+++ b/libraries/ESP8266SdFat
@@ -1 +1 @@
-Subproject commit 9472c8614033efdaa6064906e7065963581746af
+Subproject commit 3a6b688b1b5112d149295813660ef9b2b7cc0ee5
diff --git a/libraries/SD/src/SD.h b/libraries/SD/src/SD.h
index b563e2cd09..8101268a0c 100644
--- a/libraries/SD/src/SD.h
+++ b/libraries/SD/src/SD.h
@@ -25,9 +25,9 @@
 #include <SDFS.h>
 
 #undef FILE_READ
-#define FILE_READ sdfat::O_READ
+#define FILE_READ ((uint8_t)O_READ)
 #undef FILE_WRITE
-#define FILE_WRITE (sdfat::O_READ | sdfat::O_WRITE | sdfat::O_CREAT | sdfat::O_APPEND)
+#define FILE_WRITE ((uint8_t)(O_READ | O_WRITE | O_CREAT | O_APPEND))
 
 
 class SDClass {
@@ -159,9 +159,9 @@ class SDClass {
 
 private:
     const char *getMode(uint8_t mode) {
-        bool read = (mode & sdfat::O_READ) ? true : false;
-        bool write = (mode & sdfat::O_WRITE) ? true : false;
-        bool append = (mode & sdfat::O_APPEND) ? true : false;
+        bool read = (mode & O_READ) ? true : false;
+        bool write = (mode & O_WRITE) ? true : false;
+        bool append = (mode & O_APPEND) ? true : false;
         if      (  read & !write )           { return "r";  }
         else if ( !read &  write & !append ) { return "w+"; }
         else if ( !read &  write &  append ) { return "a";  }
@@ -183,10 +183,6 @@ class SDClass {
 };
 
 
-// Expose FatStructs.h helpers for MS-DOS date/time for use with dateTimeCallback
-static inline uint16_t FAT_DATE(uint16_t year, uint8_t month, uint8_t day) {
-  return (year - 1980) << 9 | month << 5 | day;
-}
 static inline uint16_t FAT_YEAR(uint16_t fatDate) {
   return 1980 + (fatDate >> 9);
 }
@@ -196,9 +192,6 @@ static inline uint8_t FAT_MONTH(uint16_t fatDate) {
 static inline uint8_t FAT_DAY(uint16_t fatDate) {
   return fatDate & 0X1F;
 }
-static inline uint16_t FAT_TIME(uint8_t hour, uint8_t minute, uint8_t second) {
-  return hour << 11 | minute << 5 | second >> 1;
-}
 static inline uint8_t FAT_HOUR(uint16_t fatTime) {
   return fatTime >> 11;
 }
diff --git a/libraries/SDFS/src/SDFS.cpp b/libraries/SDFS/src/SDFS.cpp
index e7a891a08a..5725a6ae08 100644
--- a/libraries/SDFS/src/SDFS.cpp
+++ b/libraries/SDFS/src/SDFS.cpp
@@ -64,13 +64,13 @@ FileImplPtr SDFSImpl::open(const char* path, OpenMode openMode, AccessMode acces
         }
         free(pathStr);
     }
-    sdfat::File32 fd = _fs.open(path, flags);
+    File32 fd = _fs.open(path, flags);
     if (!fd) {
         DEBUGV("SDFSImpl::openFile: fd=%p path=`%s` openMode=%d accessMode=%d",
                &fd, path, openMode, accessMode);
         return FileImplPtr();
     }
-    auto sharedFd = std::make_shared<sdfat::File32>(fd);
+    auto sharedFd = std::make_shared<File32>(fd);
     return std::make_shared<SDFSFileImpl>(this, sharedFd, path);
 }
 
@@ -90,14 +90,14 @@ DirImplPtr SDFSImpl::openDir(const char* path)
     }
     // At this point we have a name of "/blah/blah/blah" or "blah" or ""
     // If that references a directory, just open it and we're done.
-    sdfat::File32 dirFile;
+    File32 dirFile;
     const char *filter = "";
     if (!pathStr[0]) {
         // openDir("") === openDir("/")
-        dirFile = _fs.open("/", sdfat::O_RDONLY);
+        dirFile = _fs.open("/", O_RDONLY);
         filter = "";
     } else if (_fs.exists(pathStr)) {
-        dirFile = _fs.open(pathStr, sdfat::O_RDONLY);
+        dirFile = _fs.open(pathStr, O_RDONLY);
         if (dirFile.isDir()) {
             // Easy peasy, path specifies an existing dir!
             filter = "";
@@ -107,12 +107,12 @@ DirImplPtr SDFSImpl::openDir(const char* path)
             char *ptr = strrchr(pathStr, '/');
             if (!ptr) {
                 // No slashes, open the root dir
-                dirFile = _fs.open("/", sdfat::O_RDONLY);
+                dirFile = _fs.open("/", O_RDONLY);
                 filter = pathStr;
             } else {
                 // We've got slashes, open the dir one up
                 *ptr = 0; // Remove slash, truncare string
-                dirFile = _fs.open(pathStr, sdfat::O_RDONLY);
+                dirFile = _fs.open(pathStr, O_RDONLY);
                 filter = ptr + 1;
             }
         }
@@ -122,12 +122,12 @@ DirImplPtr SDFSImpl::openDir(const char* path)
         char *ptr = strrchr(pathStr, '/');
         if (!ptr) {
             // No slashes, open the root dir
-            dirFile = _fs.open("/", sdfat::O_RDONLY);
+            dirFile = _fs.open("/", O_RDONLY);
             filter = pathStr;
         } else {
             // We've got slashes, open the dir one up
             *ptr = 0; // Remove slash, truncare string
-            dirFile = _fs.open(pathStr, sdfat::O_RDONLY);
+            dirFile = _fs.open(pathStr, O_RDONLY);
             filter = ptr + 1;
         }
     }
@@ -135,7 +135,7 @@ DirImplPtr SDFSImpl::openDir(const char* path)
         DEBUGV("SDFSImpl::openDir: path=`%s`\n", path);
         return DirImplPtr();
     }
-    auto sharedDir = std::make_shared<sdfat::File32>(dirFile);
+    auto sharedDir = std::make_shared<File32>(dirFile);
     auto ret = std::make_shared<SDFSDirImpl>(filter, this, sharedDir, pathStr);
     free(pathStr);
     return ret;
@@ -145,12 +145,12 @@ bool SDFSImpl::format() {
     if (_mounted) {
         return false;
     }
-    sdfat::SdCardFactory cardFactory;
-    sdfat::SdCard* card = cardFactory.newCard(sdfat::SdSpiConfig(_cfg._csPin, DEDICATED_SPI, _cfg._spiSettings));
+    SdCardFactory cardFactory;
+    SdCard* card = cardFactory.newCard(SdSpiConfig(_cfg._csPin, DEDICATED_SPI, _cfg._spiSettings));
     if (!card || card->errorCode()) {
         return false;
     }
-    sdfat::FatFormatter fatFormatter;
+    FatFormatter fatFormatter;
     uint8_t *sectorBuffer = new uint8_t[512];
     bool ret = fatFormatter.format(card, sectorBuffer, nullptr);
     delete[] sectorBuffer;
diff --git a/libraries/SDFS/src/SDFS.h b/libraries/SDFS/src/SDFS.h
index 542be537ce..6e13cdf24d 100644
--- a/libraries/SDFS/src/SDFS.h
+++ b/libraries/SDFS/src/SDFS.h
@@ -97,11 +97,11 @@ class SDFSImpl : public FSImpl
             return false;
         }
         info.maxOpenFiles = 999; // TODO - not valid
-        info.blockSize = _fs.vol()->sectorsPerCluster() * _fs.vol()->bytesPerSector();
+        info.blockSize = _fs.vol()->bytesPerCluster();
         info.pageSize = 0; // TODO ?
         info.maxPathLength = 255; // TODO ?
         info.totalBytes =_fs.vol()->clusterCount() * info.blockSize;
-        info.usedBytes = info.totalBytes - (_fs.vol()->freeClusterCount() * _fs.vol()->sectorsPerCluster() * _fs.vol()->bytesPerSector());
+        info.usedBytes = info.totalBytes - (_fs.vol()->freeClusterCount() * _fs.vol()->bytesPerCluster());
         return true;
     }
 
@@ -156,7 +156,7 @@ class SDFSImpl : public FSImpl
             format();
             _mounted = _fs.begin(_cfg._csPin, _cfg._spiSettings);
         }
-	sdfat::FsDateTime::setCallback(dateTimeCB);
+	FsDateTime::setCallback(dateTimeCB);
         return _mounted;
     }
 
@@ -185,7 +185,7 @@ class SDFSImpl : public FSImpl
         return (totalClusters() / blocksPerCluster());
     }
     size_t clusterSize() {
-        return blocksPerCluster() * _fs.vol()->bytesPerSector();
+        return _fs.vol()->bytesPerCluster();
     }
     size_t size() {
         return (clusterSize() * totalClusters());
@@ -229,8 +229,7 @@ class SDFSImpl : public FSImpl
     friend class SDFileImpl;
     friend class SDFSDirImpl;
 
-    sdfat::SdFat* getFs()
-    {
+    SdFat* getFs() {
         return &_fs;
     }
 
@@ -238,24 +237,25 @@ class SDFSImpl : public FSImpl
     static uint8_t _getFlags(OpenMode openMode, AccessMode accessMode) {
         uint8_t mode = 0;
         if (openMode & OM_CREATE) {
-            mode |= sdfat::O_CREAT;
+            mode |= O_CREAT;
         }
         if (openMode & OM_APPEND) {
-            mode |= sdfat::O_AT_END;
+            mode |= O_AT_END;
         }
         if (openMode & OM_TRUNCATE) {
-            mode |= sdfat::O_TRUNC;
-        }
-        if (accessMode & AM_READ) {
-            mode |= sdfat::O_READ;
+            mode |= O_TRUNC;
         }
-        if (accessMode & AM_WRITE) {
-            mode |= sdfat::O_WRITE;
+        if ((accessMode & (AM_READ | AM_WRITE)) == (AM_READ | AM_WRITE)) {
+            mode |= O_RDWR;
+        } else if (accessMode & AM_READ) {
+            mode |= O_READ;
+        } else if (accessMode & AM_WRITE) {
+            mode |= O_WRITE;
         }
         return mode;
     }
 
-    sdfat::SdFat _fs;
+    SdFat        _fs;
     SDFSConfig   _cfg;
     bool         _mounted;
 };
@@ -264,7 +264,7 @@ class SDFSImpl : public FSImpl
 class SDFSFileImpl : public FileImpl
 {
 public:
-    SDFSFileImpl(SDFSImpl *fs, std::shared_ptr<sdfat::File32> fd, const char *name)
+    SDFSFileImpl(SDFSImpl *fs, std::shared_ptr<File32> fd, const char *name)
         : _fs(fs), _fd(fd), _opened(true)
     {
         _name = std::shared_ptr<char>(new char[strlen(name) + 1], std::default_delete<char[]>());
@@ -380,7 +380,7 @@ class SDFSFileImpl : public FileImpl
     time_t getLastWrite() override {
         time_t ftime = 0;
         if (_opened && _fd) {
-            sdfat::DirFat_t tmp;
+            DirFat_t tmp;
             if (_fd.get()->dirEntry(&tmp)) {
                 ftime = SDFSImpl::FatToTimeT(*(uint16_t*)tmp.modifyDate, *(uint16_t*)tmp.modifyTime);
             }
@@ -391,7 +391,7 @@ class SDFSFileImpl : public FileImpl
     time_t getCreationTime() override {
         time_t ftime = 0;
         if (_opened && _fd) {
-            sdfat::DirFat_t tmp;
+            DirFat_t tmp;
             if (_fd.get()->dirEntry(&tmp)) {
                 ftime = SDFSImpl::FatToTimeT(*(uint16_t*)tmp.createDate, *(uint16_t*)tmp.createTime);
             }
@@ -400,16 +400,16 @@ class SDFSFileImpl : public FileImpl
     }
 
 protected:
-    SDFSImpl*                     _fs;
-    std::shared_ptr<sdfat::File32>  _fd;
-    std::shared_ptr<char>         _name;
-    bool                          _opened;
+    SDFSImpl*                _fs;
+    std::shared_ptr<File32>  _fd;
+    std::shared_ptr<char>    _name;
+    bool                     _opened;
 };
 
 class SDFSDirImpl : public DirImpl
 {
 public:
-    SDFSDirImpl(const String& pattern, SDFSImpl* fs, std::shared_ptr<sdfat::File32> dir, const char *dirPath = nullptr)
+    SDFSDirImpl(const String& pattern, SDFSImpl* fs, std::shared_ptr<File32> dir, const char *dirPath = nullptr)
         : _pattern(pattern), _fs(fs), _dir(dir), _valid(false), _dirPath(nullptr)
     {
         if (dirPath) {
@@ -484,14 +484,14 @@ class SDFSDirImpl : public DirImpl
     {
         const int n = _pattern.length();
         do {
-            sdfat::File32 file;
-            file.openNext(_dir.get(), sdfat::O_READ);
+            File32 file;
+            file.openNext(_dir.get(), O_READ);
             if (file) {
                 _valid = 1;
                 _size = file.fileSize();
                 _isFile = file.isFile();
                 _isDirectory = file.isDir();
-                sdfat::DirFat_t tmp;
+                DirFat_t tmp;
                 if (file.dirEntry(&tmp)) {
                     _time = SDFSImpl::FatToTimeT(*(uint16_t*)tmp.modifyDate, *(uint16_t*)tmp.modifyTime);
                     _creation = SDFSImpl::FatToTimeT(*(uint16_t*)tmp.createDate, *(uint16_t*)tmp.createTime);
@@ -516,17 +516,17 @@ class SDFSDirImpl : public DirImpl
     }
 
 protected:
-    String                       _pattern;
-    SDFSImpl*                    _fs;
-    std::shared_ptr<sdfat::File32> _dir;
-    bool                         _valid;
-    char                         _lfn[64];
-    time_t                       _time;
-    time_t                       _creation;
-    std::shared_ptr<char>        _dirPath;
-    uint32_t                     _size;
-    bool                         _isFile;
-    bool                         _isDirectory;
+    String                  _pattern;
+    SDFSImpl*               _fs;
+    std::shared_ptr<File32> _dir;
+    bool                    _valid;
+    char                    _lfn[64];
+    time_t                  _time;
+    time_t                  _creation;
+    std::shared_ptr<char>   _dirPath;
+    uint32_t                _size;
+    bool                    _isFile;
+    bool                    _isDirectory;
 };
 
 }; // namespace sdfs
diff --git a/tests/common.sh b/tests/common.sh
index a99ff6a9c0..b6ce2fe61e 100755
--- a/tests/common.sh
+++ b/tests/common.sh
@@ -9,16 +9,13 @@ function skip_ino()
     read -d '' skiplist << EOL || true
 /#attic/
 /AvrAdcLogger/
-/BackwardCompatibility/
 /examplesV1/
-/ExFatFormatter/
-/ExFatLogger/
-/ExFatUnicodeTest/
 /RtcTimestampTest/
 /SoftwareSpi/
-/STM32Test/
+/TeensyDmaAdcLogger/
 /TeensyRtcTimestamp/
 /TeensySdioDemo/
+/TeensySdioLogger/
 /UserChipSelectFunction/
 /UserSPIDriver/
 EOL
diff --git a/tests/host/Makefile b/tests/host/Makefile
index 8cb9d89297..a2353a0841 100644
--- a/tests/host/Makefile
+++ b/tests/host/Makefile
@@ -104,12 +104,16 @@ CORE_CPP_FILES := \
 		FatLib/FatFilePrint.cpp \
 		FatLib/FatFileSFN.cpp \
 		FatLib/FatFormatter.cpp \
+		FatLib/FatName.cpp \
 		FatLib/FatVolume.cpp \
 		FatLib/FatPartition.cpp \
 		common/FmtNumber.cpp \
+		common/FsCache.cpp \
 		common/FsStructs.cpp \
 		common/FsDateTime.cpp \
-		common/PrintBasic.cpp \
+		common/FsUtf.cpp \
+		common/FsName.cpp \
+		common/upcase.cpp \
 	) \
 	$(abspath $(LIBRARIES_PATH)/SDFS/src/SDFS.cpp) \
 	$(abspath $(LIBRARIES_PATH)/SD/src/SD.cpp) \

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