diff --git a/file_io/include/aare/file_io/File.hpp b/file_io/include/aare/file_io/File.hpp
index ee00714..b51c5c7 100644
--- a/file_io/include/aare/file_io/File.hpp
+++ b/file_io/include/aare/file_io/File.hpp
@@ -26,6 +26,7 @@ class File {
     void write(Frame &frame);
     Frame read();
     Frame iread(size_t frame_number);
+    std::vector<Frame> iread(size_t frame_number, size_t n_frames);
     std::vector<Frame> read(size_t n_frames);
     void read_into(std::byte *image_buf);
     void read_into(std::byte *image_buf, size_t n_frames);
diff --git a/file_io/include/aare/file_io/FileInterface.hpp b/file_io/include/aare/file_io/FileInterface.hpp
index 123fa72..631eeaf 100644
--- a/file_io/include/aare/file_io/FileInterface.hpp
+++ b/file_io/include/aare/file_io/FileInterface.hpp
@@ -134,28 +134,14 @@ class FileInterface {
      * @param frame_number frame number to read
      * @return frame
      */
-    Frame iread(size_t frame_number) {
-        auto old_pos = tell();
-        seek(frame_number);
-        Frame tmp = read();
-        seek(old_pos);
-        return tmp;
-    };
-
+    virtual Frame iread(size_t frame_number)=0;
     /**
      * @brief read n_frames from the file starting at the given frame number
      * @param frame_number frame number to start reading from
      * @param n_frames number of frames to read
      * @return vector of frames
      */
-    std::vector<Frame> iread(size_t frame_number, size_t n_frames) {
-        auto old_pos = tell();
-        seek(frame_number);
-        std::vector<Frame> tmp = read(n_frames);
-        seek(old_pos);
-        return tmp;
-    }
-
+    virtual std::vector<Frame> iread(size_t frame_number, size_t n_frames)=0;
     // function to query the data type of the file
     /*virtual DataType dtype = 0; */
 
diff --git a/file_io/include/aare/file_io/NumpyFile.hpp b/file_io/include/aare/file_io/NumpyFile.hpp
index 5a72179..969a597 100644
--- a/file_io/include/aare/file_io/NumpyFile.hpp
+++ b/file_io/include/aare/file_io/NumpyFile.hpp
@@ -72,6 +72,21 @@ class NumpyFile : public FileInterface {
         }
         return arr;
     }
+    Frame iread(size_t frame_number) {
+        auto old_pos = tell();
+        seek(frame_number);
+        Frame tmp = read();
+        seek(old_pos);
+        return tmp;
+    };
+
+    std::vector<Frame> iread(size_t frame_number, size_t n_frames) {
+        auto old_pos = tell();
+        seek(frame_number);
+        std::vector<Frame> tmp = read(n_frames);
+        seek(old_pos);
+        return tmp;
+    }
 
     ~NumpyFile() noexcept override;
 
diff --git a/file_io/include/aare/file_io/RawFile.hpp b/file_io/include/aare/file_io/RawFile.hpp
index 4cfe77d..31a3c12 100644
--- a/file_io/include/aare/file_io/RawFile.hpp
+++ b/file_io/include/aare/file_io/RawFile.hpp
@@ -26,8 +26,8 @@ class RawFile : public FileInterface {
      */
     void write([[maybe_unused]] Frame &frame) override { throw std::runtime_error("Not implemented"); };
     Frame read() override {
-        return get_frame(frame_number(this->current_frame++));
-    };
+      std::cout << "Reading frame " << this->current_frame << std::endl;
+       return get_frame(frame_number(this->current_frame++)); };
     std::vector<Frame> read(size_t n_frames) override;
     void read_into(std::byte *image_buf) override {
         return get_frame_into(frame_number(this->current_frame++), image_buf);
@@ -48,10 +48,13 @@ class RawFile : public FileInterface {
     size_t pixels_per_frame() override { return m_rows * m_cols; }
 
     // goto frame number
-    void seek(size_t frame_number) override { this->current_frame = frame_number; };
+    void seek(size_t frame_number) override { this->current_frame = frame_number + m_starting_frame;
+    std::cout<<"Seeking to frame "<<frame_number<<std::endl;
+    std::cout<<"Current frame is "<<this->current_frame<<std::endl;
+    };
 
     // return the position of the file pointer (in number of frames)
-    size_t tell() override { return this->current_frame; };
+    size_t tell() override { return this->current_frame - m_starting_frame; };
 
     /**
      * @brief check if the file is a master file
@@ -98,6 +101,21 @@ class RawFile : public FileInterface {
     size_t rows() const override { return m_rows; }
     size_t cols() const override { return m_cols; }
     size_t bitdepth() const override { return m_bitdepth; }
+    Frame iread(size_t frame_number) override {
+        auto old_pos = tell();
+        seek(frame_number);
+        Frame tmp = read();
+        seek(old_pos);
+        return tmp;
+    }
+
+    std::vector<Frame> iread(size_t frame_number, size_t n_frames) override {
+        auto old_pos = tell();
+        seek(frame_number);
+        std::vector<Frame> tmp = read(n_frames);
+        seek(old_pos);
+        return tmp;
+    }
 
   private:
     /**
diff --git a/file_io/include/aare/file_io/SubFile.hpp b/file_io/include/aare/file_io/SubFile.hpp
index f82af39..b286a8a 100644
--- a/file_io/include/aare/file_io/SubFile.hpp
+++ b/file_io/include/aare/file_io/SubFile.hpp
@@ -45,7 +45,8 @@ class SubFile {
      * @param bitdepth bitdepth of the subfile
      * @throws std::invalid_argument if the detector,type pair is not supported
      */
-    SubFile(const std::filesystem::path &fname, DetectorType detector, size_t rows, size_t cols, size_t bitdepth,int subfile_id);
+    SubFile(const std::filesystem::path &fname, DetectorType detector, size_t rows, size_t cols, size_t bitdepth,
+            int subfile_id);
 
     /**
      * @brief read the subfile into a buffer
diff --git a/file_io/src/File.cpp b/file_io/src/File.cpp
index 8848be8..ca3b811 100644
--- a/file_io/src/File.cpp
+++ b/file_io/src/File.cpp
@@ -45,6 +45,9 @@ size_t File::bitdepth() const { return file_impl->bitdepth(); }
 File::~File() { delete file_impl; }
 
 Frame File::iread(size_t frame_number) { return file_impl->iread(frame_number); }
+std::vector<Frame> File::iread(size_t frame_number, size_t n_frames) {
+    return file_impl->iread(frame_number, n_frames);
+}
 
 File::File(File &&other) noexcept : file_impl(other.file_impl) { other.file_impl = nullptr; }
 
diff --git a/file_io/src/RawFile.cpp b/file_io/src/RawFile.cpp
index 543c9b7..5f85cab 100644
--- a/file_io/src/RawFile.cpp
+++ b/file_io/src/RawFile.cpp
@@ -24,7 +24,9 @@ RawFile::RawFile(const std::filesystem::path &fname, const std::string &mode, co
     } else {
         throw std::runtime_error(LOCATION + "Unsupported mode");
     }
+    aare::logger::error("axxxsdasda", m_starting_frame);
     m_starting_frame = this->frame_number(0);
+    aare::logger::error("asdasda", m_starting_frame);
 }
 
 void RawFile::open_subfiles() {