diff --git a/gpt_disk_io/CHANGELOG.md b/gpt_disk_io/CHANGELOG.md
index d7850d3..b48f194 100644
--- a/gpt_disk_io/CHANGELOG.md
+++ b/gpt_disk_io/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Unreleased
 
 * MSRV increased to 1.81.
+* The `Error` trait is now unconditionally implemented for all error types.
 
 # 0.16.1
 
diff --git a/gpt_disk_io/README.md b/gpt_disk_io/README.md
index 747bc77..eff08d2 100644
--- a/gpt_disk_io/README.md
+++ b/gpt_disk_io/README.md
@@ -13,8 +13,10 @@ See also the [`gpt_disk_types`] package.
 
 ## Features
 
-* `std`: Enables the `StdBlockIo` type, as well as `std::error::Error`
-  implementations for all of the error types. Off by default.
+No features are enabled by default.
+
+* `alloc`: Enables `Vec` implementation of `BlockIoAdapter`.
+* `std`: Enables `std::io` implementations of `BlockIoAdapter`.
   
 ## Minimum Supported Rust Version (MSRV)
 
diff --git a/gpt_disk_io/src/block_io/slice_block_io.rs b/gpt_disk_io/src/block_io/slice_block_io.rs
index 3870df2..06c5639 100644
--- a/gpt_disk_io/src/block_io/slice_block_io.rs
+++ b/gpt_disk_io/src/block_io/slice_block_io.rs
@@ -15,11 +15,6 @@ use gpt_disk_types::{BlockSize, Lba};
 use alloc::vec::Vec;
 
 /// Error type used for `&[u8]` and `&mut [u8]` versions of [`BlockIoAdapter`].
-///
-/// If the `std` feature is enabled, this type implements the [`Error`]
-/// trait.
-///
-/// [`Error`]: std::error::Error
 #[allow(clippy::module_name_repetitions)]
 #[derive(Clone, Copy, Debug, Default, Eq, PartialEq, Hash, Ord, PartialOrd)]
 pub enum SliceBlockIoError {
@@ -60,6 +55,8 @@ impl Display for SliceBlockIoError {
     }
 }
 
+impl core::error::Error for SliceBlockIoError {}
+
 #[track_caller]
 fn buffer_byte_range_opt(
     block_size: BlockSize,
diff --git a/gpt_disk_io/src/disk.rs b/gpt_disk_io/src/disk.rs
index 26b8459..89fa067 100644
--- a/gpt_disk_io/src/disk.rs
+++ b/gpt_disk_io/src/disk.rs
@@ -146,6 +146,11 @@ where
     }
 }
 
+impl<IoError> core::error::Error for DiskError<IoError> where
+    IoError: Debug + Display
+{
+}
+
 /// Read and write GPT disk data.
 ///
 /// The disk is accessed via an object implementing the [`BlockIo`]
diff --git a/gpt_disk_io/src/lib.rs b/gpt_disk_io/src/lib.rs
index d31de85..c6a5526 100644
--- a/gpt_disk_io/src/lib.rs
+++ b/gpt_disk_io/src/lib.rs
@@ -22,9 +22,7 @@
 //! # Features
 //!
 //! * `alloc`: Enables [`Vec`] implementation of [`BlockIoAdapter`].
-//! * `std`: Enables [`std::io`] implementations of [`BlockIoAdapter`],
-//!   as well as `std::error::Error` implementations for all of the
-//!   error types. Off by default.
+//! * `std`: Enables [`std::io`] implementations of [`BlockIoAdapter`].
 //!
 //! # Examples
 //!
@@ -136,8 +134,6 @@ extern crate alloc;
 
 mod block_io;
 mod disk;
-#[cfg(feature = "std")]
-mod std_support;
 
 // Re-export dependencies.
 pub use gpt_disk_types;
diff --git a/gpt_disk_io/src/std_support.rs b/gpt_disk_io/src/std_support.rs
deleted file mode 100644
index bcaac5f..0000000
--- a/gpt_disk_io/src/std_support.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2022 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use crate::{DiskError, SliceBlockIoError};
-use std::error::Error;
-use std::fmt::{Debug, Display};
-
-impl<Custom> Error for DiskError<Custom> where Custom: Debug + Display {}
-
-impl Error for SliceBlockIoError {}