diff --git a/subprojects/memcard/include/memcard/block.hpp b/subprojects/memcard/include/memcard/block.hpp
index aa9f205..8e5e17f 100644
--- a/subprojects/memcard/include/memcard/block.hpp
+++ b/subprojects/memcard/include/memcard/block.hpp
@@ -76,6 +76,7 @@ public:
 	std::size_t index() const { return m_index; }
 	std::string title() const;
 	std::size_t available_blocks() const;
+	uint32_t use_byte() const;
 	uint16_t link_order() const;
 	CountryCode country_code() const;
 	std::string product_code() const;
diff --git a/subprojects/memcard/src/block.cpp b/subprojects/memcard/src/block.cpp
index 3a67191..18c27cf 100644
--- a/subprojects/memcard/src/block.cpp
+++ b/subprojects/memcard/src/block.cpp
@@ -204,6 +204,11 @@ std::size_t BasicBlock<Const>::available_blocks() const {
 	return m_toc_entry.data()[0];
 }
 
+template <bool Const>
+uint32_t BasicBlock<Const>::use_byte() const {
+	return read_as<uint32_t>(m_toc_entry, 0x04);
+}
+
 template <bool Const>
 uint16_t BasicBlock<Const>::link_order() const {
 	return read_as<uint16_t>(m_toc_entry, 0x08);