diff --git a/src/lib.rs b/src/lib.rs
index a9303c6..56560f4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -54,16 +54,10 @@ pub trait Storage: ReadStorage {
 	fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error>;
 }
 
-/// The size in bytes of a single block read or written by a [`BlockDevice`].
-pub const BLOCK_SIZE: usize = 512;
-
-/// A single block which may be read or written by a [`BlockDevice`].
-///
-/// Also referred to as a sector in some contexts.
-pub type Block = [u8; BLOCK_SIZE];
-
 /// A device which can read and write whole numbers of blocks.
-pub trait BlockDevice {
+///
+/// Blocks are also referred to as sectors in some contexts.
+pub trait BlockDevice<const BLOCK_SIZE: usize = 512> {
 	/// The error type returned by methods on this trait.
 	type Error;
 
@@ -74,11 +68,19 @@ pub trait BlockDevice {
 	///
 	/// `first_block_index + blocks.len()` must not be greater than the size returned by
 	/// `block_count`.
-	fn read(&mut self, first_block_index: u64, blocks: &mut [Block]) -> Result<(), Self::Error>;
+	fn read(
+		&mut self,
+		first_block_index: u64,
+		blocks: &mut [[u8; BLOCK_SIZE]],
+	) -> Result<(), Self::Error>;
 
 	/// Writes some number of blocks to the device, starting at `first_block_index`.
 	///
 	/// `first_block_index + blocks.len()` must not be greater than the size returned by
 	/// `block_count`.
-	fn write(&mut self, first_block_index: u64, blocks: &[Block]) -> Result<(), Self::Error>;
+	fn write(
+		&mut self,
+		first_block_index: u64,
+		blocks: &[[u8; BLOCK_SIZE]],
+	) -> Result<(), Self::Error>;
 }