diff --git a/Cargo.lock b/Cargo.lock
index e8a0797..d2de4c9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -73,21 +73,6 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4c7f02d4ea65f2c1853089ffd8d2787bdbc63de2f0d29dedbcf8ccdfa0ccd4cf"
 
-[[package]]
-name = "bit-set"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08807e080ed7f9d5433fa9b275196cfc35414f66a0c79d864dc51a0d825231a3"
-dependencies = [
- "bit-vec",
-]
-
-[[package]]
-name = "bit-vec"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e764a1d40d510daf35e07be9eb06e75770908c27d411ee6c92109c9840eaaf7"
-
 [[package]]
 name = "bitflags"
 version = "2.6.0"
@@ -562,15 +547,6 @@ version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
-[[package]]
-name = "memmap2"
-version = "0.9.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fd3f7eed9d3848f8b98834af67102b720745c4ec028fcd0aa0239277e7de374f"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "mimalloc"
 version = "0.1.43"
@@ -602,7 +578,6 @@ dependencies = [
  "adler",
  "aes",
  "base16ct",
- "bit-set",
  "bytes",
  "bzip2",
  "cbc",
@@ -617,7 +592,6 @@ dependencies = [
  "liblzma-sys",
  "lru",
  "md-5",
- "memmap2",
  "miniz_oxide",
  "openssl",
  "polonius-the-crab",
diff --git a/nod/Cargo.toml b/nod/Cargo.toml
index 075a5f2..a11bfe5 100644
--- a/nod/Cargo.toml
+++ b/nod/Cargo.toml
@@ -27,7 +27,6 @@ openssl-vendored = ["openssl", "openssl/vendored"]
 adler = { version = "1.0", optional = true }
 aes = "0.9.0-pre.2"
 base16ct = "0.2"
-bit-set = "0.8"
 bytes = "1.8"
 bzip2 = { version = "0.4", features = ["static"], optional = true }
 cbc = "0.2.0-pre.2"
@@ -42,7 +41,6 @@ liblzma = { version = "0.3", features = ["static"], optional = true }
 liblzma-sys = { version = "0.3", features = ["static"], optional = true }
 lru = "0.12"
 md-5 = { workspace = true }
-memmap2 = "0.9"
 miniz_oxide = { version = "0.8", optional = true }
 openssl = { version = "0.10", optional = true }
 polonius-the-crab = "0.4"
diff --git a/nod/src/io/mapped.rs b/nod/src/io/mapped.rs
deleted file mode 100644
index e881cc7..0000000
--- a/nod/src/io/mapped.rs
+++ /dev/null
@@ -1,51 +0,0 @@
-use std::{io, path::Path, sync::Arc};
-
-use memmap2::Mmap;
-
-use crate::{util::impl_read_for_bufread, Result, ResultContext};
-
-pub struct MappedFileReader {
-    inner: Arc<Mmap>,
-    pos: usize,
-}
-
-impl Clone for MappedFileReader {
-    fn clone(&self) -> Self { Self { inner: self.inner.clone(), pos: 0 } }
-}
-
-impl MappedFileReader {
-    #[expect(unused)]
-    pub fn new(path: &Path) -> Result<Self> {
-        let file = std::fs::File::open(path)
-            .with_context(|| format!("Failed to open file {}", path.display()))?;
-        let inner = unsafe { Mmap::map(&file) }
-            .with_context(|| format!("Failed to map file {}", path.display()))?;
-        Ok(Self { inner: Arc::new(inner), pos: 0 })
-    }
-}
-
-impl io::BufRead for MappedFileReader {
-    fn fill_buf(&mut self) -> io::Result<&[u8]> {
-        if self.pos < self.inner.len() {
-            Ok(&self.inner[self.pos..])
-        } else {
-            Ok(&[])
-        }
-    }
-
-    fn consume(&mut self, amt: usize) { self.pos = self.pos.saturating_add(amt); }
-}
-
-impl_read_for_bufread!(MappedFileReader);
-
-impl io::Seek for MappedFileReader {
-    fn seek(&mut self, pos: io::SeekFrom) -> io::Result<u64> {
-        let pos = match pos {
-            io::SeekFrom::Start(pos) => pos,
-            io::SeekFrom::End(pos) => (self.inner.len() as u64).saturating_add_signed(pos),
-            io::SeekFrom::Current(off) => (self.pos as u64).saturating_add_signed(off),
-        };
-        self.pos = pos.try_into().map_err(|_| io::ErrorKind::UnexpectedEof)?;
-        Ok(pos)
-    }
-}
diff --git a/nod/src/io/mod.rs b/nod/src/io/mod.rs
index c5bae02..9a0e6da 100644
--- a/nod/src/io/mod.rs
+++ b/nod/src/io/mod.rs
@@ -5,7 +5,6 @@ pub(crate) mod ciso;
 #[cfg(feature = "compress-zlib")]
 pub(crate) mod gcz;
 pub(crate) mod iso;
-pub(crate) mod mapped;
 pub(crate) mod nfs;
 pub(crate) mod nkit;
 pub(crate) mod split;
diff --git a/nod/src/io/wia.rs b/nod/src/io/wia.rs
index b6ddb56..7c42a48 100644
--- a/nod/src/io/wia.rs
+++ b/nod/src/io/wia.rs
@@ -1517,6 +1517,7 @@ impl DiscWriterWIA {
 
         let mut partitions = <[WIAPartition]>::new_box_zeroed_with_elems(num_partitions as usize)?;
         let mut raw_data = <[WIARawData]>::new_box_zeroed_with_elems(num_raw_data as usize)?;
+        raw_data[0].raw_data_offset = (DISC_HEAD_SIZE as u64).into();
 
         let mut raw_data_idx = 0;
         let mut group_idx = 0;