diff --git a/m770/777100.cpp b/m770/777100.cpp
index 4eb6f7ada..a3dabf4f1 100755
--- a/m770/777100.cpp
+++ b/m770/777100.cpp
@@ -1098,7 +1098,7 @@ bool TTrasferimento770::split(const char* path)
   TRecord770 rec;
   long records_per_disk = 0;
   int volumes = 1;
-  const bool magnetic = ::os_is_removable_drive(path);
+  const bool magnetic = ::xvt_fsys_is_removable_drive(path) !=0;
   if (magnetic)
   {
     if (!yesno_box("Inserire il primo disco del trasferimento nell'unita' %s\n"
@@ -1106,7 +1106,7 @@ bool TTrasferimento770::split(const char* path)
                    "Si desidera iniziare il trasferimento?", path))
       return FALSE;
 
-    unsigned long disk_size = ::os_get_disk_size(path);
+    unsigned long disk_size = ::xvt_fsys_get_disk_size(path, 'b') != 0;
     records_per_disk = long(disk_size / TOTAL_SIZE) - 3;  // Tolgo A,B,Z
     volumes = int((records-1)/records_per_disk)+1;
   }
diff --git a/m770/777200.cpp b/m770/777200.cpp
index 6bf6d284b..f33ec262c 100755
--- a/m770/777200.cpp
+++ b/m770/777200.cpp
@@ -639,7 +639,7 @@ bool TTrasferimentoDylog::split(const char* path)
 
   long records_per_disk = 0;
   int volumes = 1;
-  const bool magnetic = ::os_is_removable_drive(path);
+  const bool magnetic = ::xvt_fsys_is_removable_drive(path) != 0;
   if (magnetic)
   {
     if (!yesno_box("Inserire il primo disco del trasferimento nell'unita' %s\n"
@@ -647,7 +647,7 @@ bool TTrasferimentoDylog::split(const char* path)
                    "Si desidera iniziare il trasferimento?", path))
       return FALSE;
 
-    unsigned long disk_size = ::os_get_disk_size(path);
+    unsigned long disk_size = ::xvt_fsys_get_disk_size(path, 'b') != 0;
     records_per_disk = long(disk_size / REC_SIZE - 2);
     volumes = int((records-1)/records_per_disk)+1;
   }