Cleanup, add node and header commands

src/disk.rs

@@ -1,9 +1,5 @@
-//use core::result::Result;
-use core::fmt::Display;
-
 /// A disk
-pub trait Disk<E: Display> {
-    fn name(&self) -> &str;
+pub trait Disk<E> {
     fn read_at(&mut self, block: u64, buffer: &mut [u8]) -> Result<usize, E>;
     fn write_at(&mut self, block: u64, buffer: &[u8]) -> Result<usize, E>;
 }