diff --git a/rcore-fs-ext2/src/lib.rs b/rcore-fs-ext2/src/lib.rs
index 68cd187..d1493b3 100644
--- a/rcore-fs-ext2/src/lib.rs
+++ b/rcore-fs-ext2/src/lib.rs
@@ -8,15 +8,17 @@ extern crate ext2;
 #[cfg(test)]
 mod tests;
 
+use alloc::string::String;
 use alloc::sync::Arc;
+use alloc::vec;
+use core::ops::Range;
+use ext2::error::Error;
 use ext2::fs::sync::Synced;
 use ext2::fs::Ext2;
-use ext2::error::Error;
-use ext2::sector::{Size512, Address};
+use ext2::sector::{Address, Size512};
 use ext2::volume::size::Size;
 use ext2::volume::{Volume, VolumeCommit, VolumeSlice};
-use core::ops::Range;
-use rcore_fs::dev::Device;
+use rcore_fs::dev::{DevError, Device};
 use rcore_fs::vfs;
 
 #[derive(Clone)]
@@ -33,21 +35,33 @@ pub struct Ext2FileSystem {
 /// A conversion between vfs::FsError and ext2::Error
 #[derive(Debug)]
 struct Ext2Error {
-    inner: Error
+    inner: Error,
 }
 
 impl core::convert::From<Ext2Error> for vfs::FsError {
     fn from(err: Ext2Error) -> Self {
         match err.inner {
-            _ => vfs::FsError::DeviceError
+            _ => vfs::FsError::DeviceError,
         }
     }
 }
 
+impl core::convert::From<Ext2Error> for Error {
+    fn from(err: Ext2Error) -> Self {
+        err.inner
+    }
+}
+
 impl core::convert::From<Error> for Ext2Error {
     fn from(err: Error) -> Self {
+        Ext2Error { inner: err }
+    }
+}
+
+impl core::convert::From<DevError> for Ext2Error {
+    fn from(_: DevError) -> Self {
         Ext2Error {
-            inner: err
+            inner: Error::Other(String::from("unknown")),
         }
     }
 }
@@ -58,34 +72,45 @@ impl Ext2FileSystem {
     }
 
     fn open_internal(device: Arc<Device>) -> Result<Arc<Self>, Ext2Error> {
-        let volume = Ext2Volume {
-            inner: device
-        };
+        let volume = Ext2Volume { inner: device };
         let fs = Synced::new(volume.clone())?;
-        Ok(Arc::new(Ext2FileSystem {
-            inner: fs,
-            volume,
-        }))
+        Ok(Arc::new(Ext2FileSystem { inner: fs, volume }))
     }
 }
 
 impl Volume<u8, Size512> for Ext2Volume {
-    type Error = Error;
+    type Error = Ext2Error;
 
     fn size(&self) -> Size<Size512> {
         Size::Unbounded
     }
 
-    fn commit(&mut self, slice: Option<VolumeCommit<u8, Size512>>) -> Result<(), Self::Error> {
+    fn commit(&mut self, _slice: Option<VolumeCommit<u8, Size512>>) -> Result<(), Self::Error> {
         unimplemented!()
     }
 
-    unsafe fn slice_unchecked<'a>(&'a self, range: Range<Address<Size512>>) -> VolumeSlice<'a, u8, Size512> {
-        unimplemented!()
+    unsafe fn slice_unchecked<'a>(
+        &'a self,
+        range: Range<Address<Size512>>,
+    ) -> VolumeSlice<'a, u8, Size512> {
+        let index = range.start;
+        let len = range.end - range.start;
+        let mut vec = vec![0; len.into_index() as usize];
+        self.inner
+            .read_at(index.into_index() as usize, vec.as_mut_slice())
+            .unwrap();
+        VolumeSlice::new_owned(vec, index)
     }
 
-    fn slice<'a>(&'a self, range: Range<Address<Size512>>) -> Result<VolumeSlice<'a, u8, Size512>, Self::Error> {
-        unimplemented!()
+    fn slice<'a>(
+        &'a self,
+        range: Range<Address<Size512>>,
+    ) -> Result<VolumeSlice<'a, u8, Size512>, Self::Error> {
+        let index = range.start;
+        let len = range.end - range.start;
+        let mut vec = vec![0; len.into_index() as usize];
+        self.inner
+            .read_at(index.into_index() as usize, vec.as_mut_slice())?;
+        Ok(VolumeSlice::new_owned(vec, index))
     }
 }
-
diff --git a/rcore-fs-ext2/src/tests.rs b/rcore-fs-ext2/src/tests.rs
index 3e644de..3a63d30 100644
--- a/rcore-fs-ext2/src/tests.rs
+++ b/rcore-fs-ext2/src/tests.rs
@@ -17,5 +17,5 @@ fn open_sample_file() -> Arc<Ext2FileSystem> {
 
 #[test]
 fn test_open() {
-    let fs = open_sample_file();
+    let _ = open_sample_file();
 }