diff --git a/src/sys/block_group.rs b/src/sys/block_group.rs
index 2cc40e7..5a713d8 100644
--- a/src/sys/block_group.rs
+++ b/src/sys/block_group.rs
@@ -64,7 +64,7 @@ impl BlockGroupDescriptor {
     {
         let end =
             offset + Address::from(mem::size_of::<BlockGroupDescriptor>());
-        if haystack.len() < end {
+        if haystack.size() < end {
             return Err(Error::AddressOutOfBounds(
                 end.sector(),
                 end.offset(),
@@ -92,7 +92,7 @@ impl BlockGroupDescriptor {
     {
         let end = offset
             + Address::from(count * mem::size_of::<BlockGroupDescriptor>());
-        if haystack.len() < end {
+        if haystack.size() < end {
             return Err(Error::AddressOutOfBounds(
                 end.sector(),
                 end.offset(),
diff --git a/src/sys/inode.rs b/src/sys/inode.rs
index e537ccb..a969fef 100644
--- a/src/sys/inode.rs
+++ b/src/sys/inode.rs
@@ -113,7 +113,7 @@ impl Inode {
         }
 
         let end = offset + Address::from(size);
-        if haystack.len() < end {
+        if haystack.size() < end {
             return Err(Error::AddressOutOfBounds(
                 end.sector(),
                 end.offset(),
@@ -127,10 +127,6 @@ impl Inode {
 
         Ok(inode)
     }
-
-    pub fn in_use(&self) -> bool {
-        self.hard_links > 0
-    }
 }
 
 bitflags! {
diff --git a/src/sys/superblock.rs b/src/sys/superblock.rs
index 301bb35..2ad9cc6 100644
--- a/src/sys/superblock.rs
+++ b/src/sys/superblock.rs
@@ -203,7 +203,7 @@ impl Superblock {
     {
         let offset = Address::from(1024_usize);
         let end = offset + Address::from(mem::size_of::<Superblock>());
-        if haystack.len() < end {
+        if haystack.size() < end {
             return Err(Error::AddressOutOfBounds(
                 end.sector(),
                 end.offset(),
diff --git a/src/volume/mod.rs b/src/volume/mod.rs
index f9c5738..1103013 100644
--- a/src/volume/mod.rs
+++ b/src/volume/mod.rs
@@ -19,7 +19,7 @@ where
 {
     type Error;
 
-    fn len(&self) -> Length<Idx>;
+    fn size(&self) -> Length<Idx>;
     fn commit(
         &mut self,
         slice: Option<VolumeCommit<T, Idx>>,
@@ -33,7 +33,7 @@ where
         &'a self,
         range: Range<Idx>,
     ) -> Option<VolumeSlice<'a, T, Idx>> {
-        if self.len() >= range.end && self.len() > range.start {
+        if self.size() >= range.end && self.size() > range.start {
             unsafe { Some(self.slice_unchecked(range)) }
         } else {
             None
@@ -235,7 +235,7 @@ macro_rules! impl_slice {
         {
             type Error = Infallible;
 
-            fn len(&self) -> Length<Address<S>> {
+            fn size(&self) -> Length<Address<S>> {
                 Length::Bounded(
                     Address::from(<Self as AsRef<[T]>>::as_ref(self).len())
                 )
@@ -298,7 +298,7 @@ mod file {
     impl<S: Size + PartialOrd + Copy> Volume<u8, Address<S>> for RefCell<File> {
         type Error = io::Error;
 
-        fn len(&self) -> Length<Address<S>> {
+        fn size(&self) -> Length<Address<S>> {
             Length::Bounded(
                 self.borrow()
                     .metadata()