diff --git a/src/bpb.rs b/src/bpb.rs
index a1e42cf..1b0a561 100644
--- a/src/bpb.rs
+++ b/src/bpb.rs
@@ -250,8 +250,12 @@ impl Bpb {
 
     /// first data sector
     pub fn first_data_sector(&self) -> u32 {
+        println!("reserved sectors: {}", self.reserved_sector_count());
+        println!("fat sectors: {}", self.num_fats() as u32 * self.fat_size());
+        println!("root dir sectors: {}", self.root_dir_sectors());
+
         self.reserved_sector_count() as u32
-            + (self.num_fats() as u32 * self.fat_size())
+            + (self.num_fats() as u32 + self.fat_size())
             + self.root_dir_sectors() as u32
     }
 
diff --git a/src/dir.rs b/src/dir.rs
index 03564a3..9f3160c 100644
--- a/src/dir.rs
+++ b/src/dir.rs
@@ -24,27 +24,6 @@ bitflags! {
     }
 }
 
-impl Display for Attr {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let mut if_has_attr = |attr: Attr, c: char| {
-            if self.contains(attr) {
-                write!(f, "{}", c)
-            } else {
-                write!(f, "-")
-            }
-        };
-
-        if_has_attr(Attr::ReadOnly, 'R')?;
-        if_has_attr(Attr::Hidden, 'H')?;
-        if_has_attr(Attr::System, 'S')?;
-        if_has_attr(Attr::VolumeId, 'V')?;
-        if_has_attr(Attr::Directory, 'D')?;
-        if_has_attr(Attr::Archive, 'A')?;
-
-        Ok(())
-    }
-}
-
 #[derive(Debug)]
 pub struct RegularDirEntry {
     name: [u8; 11],
@@ -76,11 +55,10 @@ impl Display for RegularDirEntry {
 
         write!(
             f,
-            "DirEntry {{ {} {: <16}    created: {}    modified: {} }}",
-            self.attr,
+            "DirEntry {{ {: <16}    created: {}    modified: {} }}",
             name,
-            self.create_time().format("%a %b %d %H:%M:%S%.3f %Y"),
-            self.write_time().format("%a %b %d %H:%M:%S%.3f %Y")
+            self.create_time(),
+            self.write_time()
         )?;
 
         Ok(())
@@ -157,16 +135,6 @@ impl RegularDirEntry {
         self.name[0] == 0x00
     }
 
-    pub fn is_file(&self) -> bool {
-        !self
-            .attr
-            .intersects(Attr::Directory | Attr::System | Attr::VolumeId)
-    }
-
-    pub fn is_dir(&self) -> bool {
-        self.attr.contains(Attr::Directory) && !self.attr.intersects(Attr::System | Attr::VolumeId)
-    }
-
     pub fn name(&self) -> &[u8] {
         &self.name
     }
diff --git a/src/subslice.rs b/src/subslice.rs
index 4dbb43c..25063e8 100644
--- a/src/subslice.rs
+++ b/src/subslice.rs
@@ -1,4 +1,3 @@
-use std::fmt::Debug;
 use std::io::{Read, Write};
 
 use crate::{FatFs, SliceLike};
@@ -10,15 +9,6 @@ pub struct SubSliceMut<'a, S: SliceLike> {
     len: usize,
 }
 
-impl<S: SliceLike> Debug for SubSliceMut<'_, S> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("SubSliceMut")
-            .field("offset", &self.offset)
-            .field("len", &self.len)
-            .finish()
-    }
-}
-
 impl<S: SliceLike> SubSliceMut<'_, S> {
     pub fn new(fat_fs: &mut FatFs<S>, offset: u64, len: usize) -> SubSliceMut<'_, S> {
         SubSliceMut {
@@ -80,15 +70,6 @@ pub struct SubSlice<'a, S: SliceLike> {
     len: usize,
 }
 
-impl<S: SliceLike> Debug for SubSlice<'_, S> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("SubSliceMut")
-            .field("offset", &self.offset)
-            .field("len", &self.len)
-            .finish()
-    }
-}
-
 impl<S: SliceLike> SubSlice<'_, S> {
     pub fn new(fat_fs: &mut FatFs<S>, offset: u64, len: usize) -> SubSlice<'_, S> {
         SubSlice {