diff --git a/include/fs/archive_base.hpp b/include/fs/archive_base.hpp
index 4e5f99f1..5cd0b3bd 100644
--- a/include/fs/archive_base.hpp
+++ b/include/fs/archive_base.hpp
@@ -204,10 +204,11 @@ public:
     virtual u64 getFreeBytes() = 0;
     virtual FSResult createFile(const FSPath& path, u64 size) = 0;
     virtual FSResult deleteFile(const FSPath& path) = 0;
-    virtual FormatInfo getFormatInfo(const FSPath& path) {
+
+    virtual Rust::Result<FormatInfo, FSResult> getFormatInfo(const FSPath& path) {
         Helpers::panic("Unimplemented GetFormatInfo for %s archive", name().c_str());
         // Return a dummy struct just to avoid the UB of not returning anything, even if we panic
-        return FormatInfo{ .size = 0, .numOfDirectories = 0, .numOfFiles = 0, .duplicateData = false };
+        return Ok(FormatInfo{ .size = 0, .numOfDirectories = 0, .numOfFiles = 0, .duplicateData = false });
     }
 
     virtual FSResult createDirectory(const FSPath& path) {
@@ -224,6 +225,10 @@ public:
         return Err(FSResult::FileNotFound);
     }
 
+    virtual void format(const FSPath& path, const FormatInfo& info) {
+        Helpers::panic("Unimplemented Format for %s archive", name().c_str());
+    }
+
     // Read size bytes from a file starting at offset "offset" into a certain buffer in memory
     // Returns the number of bytes read, or nullopt if the read failed
     virtual std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) = 0;
diff --git a/include/fs/archive_ext_save_data.hpp b/include/fs/archive_ext_save_data.hpp
index b2eab9b7..95c822e9 100644
--- a/include/fs/archive_ext_save_data.hpp
+++ b/include/fs/archive_ext_save_data.hpp
@@ -17,6 +17,10 @@ public:
 	FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
 	std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;
 
+	// Takes in a binary ExtSaveData path, outputs a combination of the backing folder with the low and high save entries of the path
+	// Used for identifying the archive format info files
+	std::string getExtSaveDataPathFromBinary(const FSPath& path);
+
 	bool isShared = false;
 	std::string backingFolder; // Backing folder for the archive. Can be NAND, Gamecard or SD depending on the archive path.
 };
\ No newline at end of file
diff --git a/include/fs/archive_save_data.hpp b/include/fs/archive_save_data.hpp
index 4bc0a15e..4831f8df 100644
--- a/include/fs/archive_save_data.hpp
+++ b/include/fs/archive_save_data.hpp
@@ -11,13 +11,19 @@ public:
 	FSResult createDirectory(const FSPath& path) override;
 	FSResult createFile(const FSPath& path, u64 size) override;
 	FSResult deleteFile(const FSPath& path) override;
-	FormatInfo getFormatInfo(const FSPath& path) override;
 
 	Rust::Result<ArchiveBase*, FSResult> openArchive(const FSPath& path) override;
 	Rust::Result<DirectorySession, FSResult> openDirectory(const FSPath& path) override;
 	FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
 	std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;
 
+	void format(const FSPath& path, const FormatInfo& info) override;
+	Rust::Result<FormatInfo, FSResult> getFormatInfo(const FSPath& path) override;
+
+	std::filesystem::path getFormatInfoPath() {
+		return IOFile::getAppData() / "FormatInfo" / "SaveData.format";
+	}
+
 	// Returns whether the cart has save data or not
 	bool cartHasSaveData() {
 		auto cxi = mem.getCXI();
diff --git a/include/kernel/kernel.hpp b/include/kernel/kernel.hpp
index d43b88c0..9d46d1b9 100644
--- a/include/kernel/kernel.hpp
+++ b/include/kernel/kernel.hpp
@@ -146,6 +146,7 @@ private:
 	// File operations
 	void handleFileOperation(u32 messagePointer, Handle file);
 	void closeFile(u32 messagePointer, Handle file);
+	void flushFile(u32 messagePointer, Handle file);
 	void readFile(u32 messagePointer, Handle file);
 	void writeFile(u32 messagePointer, Handle file);
 	void getFileSize(u32 messagePointer, Handle file);
diff --git a/include/services/fs.hpp b/include/services/fs.hpp
index 48fada6e..93e28d18 100644
--- a/include/services/fs.hpp
+++ b/include/services/fs.hpp
@@ -25,13 +25,11 @@ class FSService {
 	SDMCArchive sdmc;
 	NCCHArchive ncch;
 
-	ExtSaveDataArchive extSaveData_nand;
-	ExtSaveDataArchive extSaveData_cart;
+	ExtSaveDataArchive extSaveData_sdmc;
 	ExtSaveDataArchive sharedExtSaveData_nand;
-	ExtSaveDataArchive sharedExtSaveData_cart;
 
 	ArchiveBase* getArchiveFromID(u32 id, const FSPath& archivePath);
-	std::optional<Handle> openArchiveHandle(u32 archiveID, const FSPath& path);
+	Rust::Result<Handle, FSResult> openArchiveHandle(u32 archiveID, const FSPath& path);
 	Rust::Result<Handle, FSResult> openDirectoryHandle(ArchiveBase* archive, const FSPath& path);
 	std::optional<Handle> openFileHandle(ArchiveBase* archive, const FSPath& path, const FSPath& archivePath, const FilePerms& perms);
 	FSPath readPath(u32 type, u32 pointer, u32 size);
@@ -43,6 +41,7 @@ class FSService {
 	void controlArchive(u32 messagePointer);
 	void deleteFile(u32 messagePointer);
 	void formatSaveData(u32 messagePointer);
+	void formatThisUserSaveData(u32 messagePointer);
 	void getFreeBytes(u32 messagePointer);
 	void getFormatInfo(u32 messagePointer);
 	void getPriority(u32 messagePointer);
@@ -59,8 +58,8 @@ class FSService {
 	u32 priority;
 
 public:
-	FSService(Memory& mem, Kernel& kernel) : mem(mem), saveData(mem), extSaveData_nand(mem, "NAND"), 
-		sharedExtSaveData_nand(mem, "NAND", true), extSaveData_cart(mem, "CartSave"), sharedExtSaveData_cart(mem, "CartSave", true),
+	FSService(Memory& mem, Kernel& kernel) : mem(mem), saveData(mem),
+		sharedExtSaveData_nand(mem, "../SharedFiles/NAND", true), extSaveData_sdmc(mem, "SDMC"),
 		sdmc(mem), selfNcch(mem), ncch(mem), kernel(kernel)
 	{}
 	
diff --git a/readme.md b/readme.md
index a037d81b..a7e75f22 100644
--- a/readme.md
+++ b/readme.md
@@ -53,4 +53,4 @@ Simply drag and drop a ROM to the executable if supported, or invoke the executa
 Nintendo 3DS is a registered trademark of Nintendo Co., Ltd.
 
 ![pamda](docs/img/panda.jpg)
-Here's a panda it go blep
\ No newline at end of file
+Here's a panda it go blep
diff --git a/src/core/fs/archive_ext_save_data.cpp b/src/core/fs/archive_ext_save_data.cpp
index 375ba8bc..bb7ce1a7 100644
--- a/src/core/fs/archive_ext_save_data.cpp
+++ b/src/core/fs/archive_ext_save_data.cpp
@@ -38,12 +38,27 @@ FSResult ExtSaveDataArchive::deleteFile(const FSPath& path) {
 		fs::path p = IOFile::getAppData() / backingFolder;
 		p += fs::path(path.utf16_string).make_preferred();
 
+		if (fs::is_directory(p)) {
+			Helpers::panic("ExtSaveData::DeleteFile: Tried to delete directory");
+		}
+
+		if (!fs::is_regular_file(p)) {
+			return FSResult::FileNotFound;
+		}
+
 		std::error_code ec;
 		bool success = fs::remove(p, ec);
-		return success ? FSResult::Success : FSResult::FileNotFound;
+
+		// It might still be possible for fs::remove to fail, if there's eg an open handle to a file being deleted
+		// In this case, print a warning, but still return success for now
+		if (!success) {
+			Helpers::warn("ExtSaveData::DeleteFile: fs::remove failed\n");
+		}
+
+		return FSResult::Success;
 	}
 
-	Helpers::panic("ExtSaveDataArchive::DeleteFile: Failed");
+	Helpers::panic("ExtSaveDataArchive::DeleteFile: Unknown path type");
 	return FSResult::Success;
 }
 
@@ -70,11 +85,29 @@ FileDescriptor ExtSaveDataArchive::openFile(const FSPath& path, const FilePerms&
 	return FileError;
 }
 
+std::string ExtSaveDataArchive::getExtSaveDataPathFromBinary(const FSPath& path) {
+	// TODO: Remove punning here
+	const u32 mediaType = *(u32*)&path.binary[0];
+	const u32 saveLow = *(u32*)&path.binary[4];
+	const u32 saveHigh = *(u32*)&path.binary[8];
+
+	// TODO: Should the media type be used here
+	return backingFolder + std::to_string(saveLow) + std::to_string(saveHigh);
+}
+
 Rust::Result<ArchiveBase*, FSResult> ExtSaveDataArchive::openArchive(const FSPath& path) {
 	if (path.type != PathType::Binary || path.binary.size() != 12) {
 		Helpers::panic("ExtSaveData accessed with an invalid path in OpenArchive");
 	}
 
+	// TODO: Readd the format check. I didn't manage to fix it sadly
+	// Create a format info path in the style of AppData/FormatInfo/Cartridge10390390194.format
+	// fs::path formatInfopath = IOFile::getAppData() / "FormatInfo" / (getExtSaveDataPathFromBinary(path) + ".format");
+	// Format info not found so the archive is not formatted
+	// if (!fs::is_regular_file(formatInfopath)) {
+	//	return isShared ? Err(FSResult::NotFormatted) : Err(FSResult::NotFoundInvalid);
+	//}
+
 	return Ok((ArchiveBase*)this);
 }
 
diff --git a/src/core/fs/archive_save_data.cpp b/src/core/fs/archive_save_data.cpp
index 4e8051ac..758c1312 100644
--- a/src/core/fs/archive_save_data.cpp
+++ b/src/core/fs/archive_save_data.cpp
@@ -31,7 +31,34 @@ FSResult SaveDataArchive::createDirectory(const FSPath& path) {
 }
 
 FSResult SaveDataArchive::deleteFile(const FSPath& path) {
-	Helpers::panic("[SaveData] Unimplemented DeleteFile");
+	if (path.type == PathType::UTF16) {
+		if (!isPathSafe<PathType::UTF16>(path))
+			Helpers::panic("Unsafe path in SaveData::DeleteFile");
+
+		fs::path p = IOFile::getAppData() / "SaveData";
+		p += fs::path(path.utf16_string).make_preferred();
+
+		if (fs::is_directory(p)) {
+			Helpers::panic("SaveData::DeleteFile: Tried to delete directory");
+		}
+
+		if (!fs::is_regular_file(p)) {
+			return FSResult::FileNotFound;
+		}
+
+		std::error_code ec;
+		bool success = fs::remove(p, ec);
+
+		// It might still be possible for fs::remove to fail, if there's eg an open handle to a file being deleted
+		// In this case, print a warning, but still return success for now
+		if (!success) {
+			Helpers::warn("SaveData::DeleteFile: fs::remove failed\n");
+		}
+
+		return FSResult::Success;
+	}
+
+	Helpers::panic("SaveDataArchive::DeleteFile: Unknown path type");
 	return FSResult::Success;
 }
 
@@ -93,9 +120,36 @@ Rust::Result<DirectorySession, FSResult> SaveDataArchive::openDirectory(const FS
 	return Err(FSResult::Success);
 }
 
-ArchiveBase::FormatInfo SaveDataArchive::getFormatInfo(const FSPath& path) {
-	//Helpers::panic("Unimplemented SaveData::GetFormatInfo");
-	return FormatInfo{ .size = 0, .numOfDirectories = 255, .numOfFiles = 255, .duplicateData = false };
+Rust::Result<ArchiveBase::FormatInfo, FSResult> SaveDataArchive::getFormatInfo(const FSPath& path) {
+	const fs::path formatInfoPath = getFormatInfoPath();
+	IOFile file(formatInfoPath, "rb");
+
+	// If the file failed to open somehow, we return that the archive is not formatted
+	if (!file.isOpen()) {
+		return Err(FSResult::NotFormatted);
+	}
+
+	FormatInfo ret;
+	auto [success, bytesRead] = file.readBytes(&ret, sizeof(FormatInfo));
+	if (!success || bytesRead != sizeof(FormatInfo)) {
+		Helpers::warn("SaveData::GetFormatInfo: Format file exists but was not properly read into the FormatInfo struct");
+		return Err(FSResult::NotFormatted);
+	}
+
+	return Ok(ret);
+}
+
+void SaveDataArchive::format(const FSPath& path, const ArchiveBase::FormatInfo& info) {
+	const fs::path saveDataPath = IOFile::getAppData() / "SaveData";
+	const fs::path formatInfoPath = getFormatInfoPath();
+
+	// Delete all contents by deleting the directory then recreating it 
+	fs::remove_all(saveDataPath);
+	fs::create_directories(saveDataPath);
+
+	// Write format info on disk
+	IOFile file(formatInfoPath, "wb");
+	file.writeBytes(&info, sizeof(info));
 }
 
 Rust::Result<ArchiveBase*, FSResult> SaveDataArchive::openArchive(const FSPath& path) {
@@ -104,6 +158,12 @@ Rust::Result<ArchiveBase*, FSResult> SaveDataArchive::openArchive(const FSPath&
 		return Err(FSResult::NotFoundInvalid);
 	}
 
+	const fs::path formatInfoPath = getFormatInfoPath();
+	// Format info not found so the archive is not formatted
+	if (!fs::is_regular_file(formatInfoPath)) {
+		return Err(FSResult::NotFormatted);
+	}
+
 	return Ok((ArchiveBase*)this);
 }
 
diff --git a/src/core/fs/archive_sdmc.cpp b/src/core/fs/archive_sdmc.cpp
index 23564eaa..0759fcee 100644
--- a/src/core/fs/archive_sdmc.cpp
+++ b/src/core/fs/archive_sdmc.cpp
@@ -18,7 +18,7 @@ FileDescriptor SDMCArchive::openFile(const FSPath& path, const FilePerms& perms)
 
 Rust::Result<ArchiveBase*, FSResult> SDMCArchive::openArchive(const FSPath& path) {
 	printf("SDMCArchive::OpenArchive: Failed\n");
-	return Ok((ArchiveBase*)nullptr);
+	return Err(FSResult::NotFormatted);
 }
 
 std::optional<u32> SDMCArchive::readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) {
diff --git a/src/core/kernel/file_operations.cpp b/src/core/kernel/file_operations.cpp
index 84b77837..c6307e06 100644
--- a/src/core/kernel/file_operations.cpp
+++ b/src/core/kernel/file_operations.cpp
@@ -1,3 +1,4 @@
+#include "ipc.hpp"
 #include "kernel.hpp"
 
 namespace FileOps {
@@ -7,6 +8,7 @@ namespace FileOps {
 		GetSize = 0x08040000,
 		SetSize = 0x08050080,
 		Close = 0x08080000,
+		Flush = 0x08090000,
 		SetPriority = 0x080A0040,
 		OpenLinkFile = 0x080C0000
 	};
@@ -41,7 +43,30 @@ void Kernel::closeFile(u32 messagePointer, Handle fileHandle) {
 		Helpers::panic("Called CloseFile on non-existent file");
 	}
 
-	p->getData<FileSession>()->isOpen = false;
+	FileSession* session = p->getData<FileSession>();
+	session->isOpen = false;
+	if (session->fd != nullptr) {
+		fclose(session->fd);
+	}
+
+	mem.write32(messagePointer, IPC::responseHeader(0x0808, 1, 0));
+	mem.write32(messagePointer + 4, Result::Success);
+}
+
+void Kernel::flushFile(u32 messagePointer, Handle fileHandle) {
+	logFileIO("Flushed file %X\n", fileHandle);
+
+	const auto p = getObject(fileHandle, KernelObjectType::File);
+	if (p == nullptr) [[unlikely]] {
+		Helpers::panic("Called FlushFile on non-existent file");
+	}
+
+	FileSession* session = p->getData<FileSession>();
+	if (session->fd != nullptr) {
+		fflush(session->fd);
+	}
+
+	mem.write32(messagePointer, IPC::responseHeader(0x0809, 1, 0));
 	mem.write32(messagePointer + 4, Result::Success);
 }
 
@@ -58,6 +83,8 @@ void Kernel::readFile(u32 messagePointer, Handle fileHandle) {
 		Helpers::panic("Called ReadFile on non-existent file");
 	}
 
+	mem.write32(messagePointer, IPC::responseHeader(0x0802, 2, 2));
+
 	FileSession* file = p->getData<FileSession>();
 	if (!file->isOpen) {
 		Helpers::panic("Tried to read closed file");
@@ -126,6 +153,7 @@ void Kernel::writeFile(u32 messagePointer, Handle fileHandle) {
 	IOFile f(file->fd);
 	auto [success, bytesWritten] = f.writeBytes(data.get(), size);
 
+	mem.write32(messagePointer, IPC::responseHeader(0x0803, 2, 2));
 	if (!success) {
 		Helpers::panic("Kernel::WriteFile failed");
 	} else {
@@ -146,6 +174,7 @@ void Kernel::setFileSize(u32 messagePointer, Handle fileHandle) {
 	if (!file->isOpen) {
 		Helpers::panic("Tried to get size of closed file");
 	}
+	mem.write32(messagePointer, IPC::responseHeader(0x0805, 1, 0));
 
 	if (file->fd) {
 		const u64 newSize = mem.read64(messagePointer + 4);
@@ -174,6 +203,7 @@ void Kernel::getFileSize(u32 messagePointer, Handle fileHandle) {
 	if (!file->isOpen) {
 		Helpers::panic("Tried to get size of closed file");
 	}
+	mem.write32(messagePointer, IPC::responseHeader(0x0804, 3, 0));
 
 	if (file->fd) {
 		IOFile f(file->fd);
@@ -212,6 +242,7 @@ void Kernel::openLinkFile(u32 messagePointer, Handle fileHandle) {
 	// However we do seek properly on every file access so this shouldn't matter
 	cloneFile.data = new FileSession(*file);
 
+	mem.write32(messagePointer, IPC::responseHeader(0x080C, 1, 2));
 	mem.write32(messagePointer + 4, Result::Success);
 	mem.write32(messagePointer + 12, handle);
 }
@@ -231,5 +262,6 @@ void Kernel::setFilePriority(u32 messagePointer, Handle fileHandle) {
 	}
 	file->priority = priority;
 
+	mem.write32(messagePointer, IPC::responseHeader(0x080A, 1, 0));
 	mem.write32(messagePointer + 4, Result::Success);
 }
\ No newline at end of file
diff --git a/src/core/services/fs.cpp b/src/core/services/fs.cpp
index 080c0b49..fe8bce8d 100644
--- a/src/core/services/fs.cpp
+++ b/src/core/services/fs.cpp
@@ -21,6 +21,7 @@ namespace FSCommands {
 		OpenArchive = 0x080C00C2,
 		ControlArchive = 0x080D0144,
 		CloseArchive = 0x080E0080,
+		FormatThisUserSaveData = 0x080F0180,
 		GetFreeBytes = 0x08120080,
 		IsSdmcDetected = 0x08170000,
 		GetFormatInfo = 0x084500C2,
@@ -45,23 +46,29 @@ void FSService::reset() {
 
 // Creates directories for NAND, ExtSaveData, etc if they don't already exist. Should be executed after loading a new ROM.
 void FSService::initializeFilesystem() {
-	const auto nandPath = IOFile::getAppData() / "NAND"; // Create NAND
-	const auto cartPath = IOFile::getAppData() / "CartSave"; // Create cartridge save folder for use with ExtSaveData
-	const auto savePath = IOFile::getAppData() / "SaveData"; // Create SaveData
-	namespace fs = std::filesystem;
-	// TODO: SDMC, etc
+	const auto sdmcPath = IOFile::getAppData() / "SDMC"; // Create SDMC directory
+	const auto nandSharedpath = IOFile::getAppData() / ".." / "SharedFiles" / "NAND";
 
-	if (!fs::is_directory(nandPath)) {
-		fs::create_directories(nandPath);
+	const auto savePath = IOFile::getAppData() / "SaveData"; // Create SaveData
+	const auto formatPath = IOFile::getAppData() / "FormatInfo"; // Create folder for storing archive formatting info
+	namespace fs = std::filesystem;
+
+
+	if (!fs::is_directory(nandSharedpath)) {
+		fs::create_directories(nandSharedpath);
 	}
 
-	if (!fs::is_directory(cartPath)) {
-		fs::create_directories(cartPath);
+	if (!fs::is_directory(sdmcPath)) {
+		fs::create_directories(sdmcPath);
 	}
 
 	if (!fs::is_directory(savePath)) {
 		fs::create_directories(savePath);
 	}
+
+	if (!fs::is_directory(formatPath)) {
+		fs::create_directories(formatPath);
+	}
 }
 
 ArchiveBase* FSService::getArchiveFromID(u32 id, const FSPath& archivePath) {
@@ -69,22 +76,10 @@ ArchiveBase* FSService::getArchiveFromID(u32 id, const FSPath& archivePath) {
 		case ArchiveID::SelfNCCH: return &selfNcch;
 		case ArchiveID::SaveData: return &saveData;
 		case ArchiveID::ExtSaveData:
-			if (archivePath.type == PathType::Binary) {
-				switch (archivePath.binary[0]) {
-					case 0: return &extSaveData_nand;
-					case 1: return &extSaveData_cart;
-				}
-			}
-			return nullptr;
+			return &extSaveData_sdmc;
 
 		case ArchiveID::SharedExtSaveData:
-			if (archivePath.type == PathType::Binary) {
-				switch (archivePath.binary[0]) {
-					case 0: return &sharedExtSaveData_nand;
-					case 1: return &sharedExtSaveData_cart;
-				}
-			}
-			return nullptr;
+			return &sharedExtSaveData_nand;
 
 		case ArchiveID::SDMC: return &sdmc;
 		case ArchiveID::SavedataAndNcch: return &ncch; // This can only access NCCH outside of FSPXI
@@ -121,12 +116,12 @@ Rust::Result<Handle, FSResult> FSService::openDirectoryHandle(ArchiveBase* archi
 	}
 }
 
-std::optional<Handle> FSService::openArchiveHandle(u32 archiveID, const FSPath& path) {
+Rust::Result<Handle, FSResult> FSService::openArchiveHandle(u32 archiveID, const FSPath& path) {
 	ArchiveBase* archive = getArchiveFromID(archiveID, path);
 
 	if (archive == nullptr) [[unlikely]] {
 		Helpers::panic("OpenArchive: Tried to open unknown archive %d.", archiveID);
-		return std::nullopt;
+		return Err(FSResult::NotFormatted);
 	}
 
 	Rust::Result<ArchiveBase*, FSResult> res = archive->openArchive(path);
@@ -135,10 +130,10 @@ std::optional<Handle> FSService::openArchiveHandle(u32 archiveID, const FSPath&
 		auto& archiveObject = kernel.getObjects()[handle];
 		archiveObject.data = new ArchiveSession(res.unwrap(), path);
 
-		return handle;
+		return Ok(handle);
 	}
 	else {
-		return std::nullopt;
+		return Err(res.unwrapErr());
 	}
 }
 
@@ -161,6 +156,7 @@ void FSService::handleSyncRequest(u32 messagePointer) {
 		case FSCommands::CloseArchive: closeArchive(messagePointer); break;
 		case FSCommands::DeleteFile: deleteFile(messagePointer); break;
 		case FSCommands::FormatSaveData: formatSaveData(messagePointer); break;
+		case FSCommands::FormatThisUserSaveData: formatThisUserSaveData(messagePointer); break;
 		case FSCommands::GetFreeBytes: getFreeBytes(messagePointer); break;
 		case FSCommands::GetFormatInfo: getFormatInfo(messagePointer); break;
 		case FSCommands::GetPriority: getPriority(messagePointer); break;
@@ -216,14 +212,15 @@ void FSService::openArchive(u32 messagePointer) {
 	auto archivePath = readPath(archivePathType, archivePathPointer, archivePathSize);
 	log("FS::OpenArchive(archive ID = %d, archive path type = %d)\n", archiveID, archivePathType);
 	
-	std::optional<Handle> handle = openArchiveHandle(archiveID, archivePath);
+	Rust::Result<Handle, FSResult> res = openArchiveHandle(archiveID, archivePath);
 	mem.write32(messagePointer, IPC::responseHeader(0x80C, 3, 0));
-	if (handle.has_value()) {
+	if (res.isOk()) {
 		mem.write32(messagePointer + 4, ResultCode::Success);
-		mem.write64(messagePointer + 8, handle.value());
+		mem.write64(messagePointer + 8, res.unwrap());
 	} else {
-		log("FS::OpenArchive: Failed to open archive with id = %d\n", archiveID);
-		mem.write32(messagePointer + 4, ResultCode::Failure);
+		log("FS::OpenArchive: Failed to open archive with id = %d. Error %08X\n", archiveID, (u32)res.unwrapErr());
+		mem.write32(messagePointer + 4, static_cast<u32>(res.unwrapErr()));
+		mem.write64(messagePointer + 8, 0);
 	}
 }
 
@@ -411,16 +408,25 @@ void FSService::getFormatInfo(u32 messagePointer) {
 		Helpers::panic("OpenArchive: Tried to open unknown archive %d.", archiveID);
 	}
 
-	ArchiveBase::FormatInfo info = archive->getFormatInfo(path);
 	mem.write32(messagePointer, IPC::responseHeader(0x845, 5, 0));
-	mem.write32(messagePointer + 4, ResultCode::Success);
-	mem.write32(messagePointer + 8, info.size);
-	mem.write32(messagePointer + 12, info.numOfDirectories);
-	mem.write32(messagePointer + 16, info.numOfFiles);
-	mem.write8(messagePointer + 20, info.duplicateData ? 1 : 0);
+	Rust::Result<ArchiveBase::FormatInfo, FSResult> res = archive->getFormatInfo(path);
+
+	// If the FormatInfo was returned, write them to the output buffer. Otherwise, write an error code.
+	if (res.isOk()) {
+		ArchiveBase::FormatInfo info = res.unwrap();
+		mem.write32(messagePointer + 4, ResultCode::Success);
+		mem.write32(messagePointer + 8, info.size);
+		mem.write32(messagePointer + 12, info.numOfDirectories);
+		mem.write32(messagePointer + 16, info.numOfFiles);
+		mem.write8(messagePointer + 20, info.duplicateData ? 1 : 0);
+	} else {
+		mem.write32(messagePointer + 4, static_cast<u32>(res.unwrapErr()));
+	}
 }
 
 void FSService::formatSaveData(u32 messagePointer) {
+	log("FS::FormatSaveData\n");
+
 	const u32 archiveID = mem.read32(messagePointer + 4);
 	if (archiveID != ArchiveID::SaveData)
 		Helpers::panic("FS::FormatSaveData: Archive is not SaveData");
@@ -440,13 +446,43 @@ void FSService::formatSaveData(u32 messagePointer) {
 	const u32 fileNum = mem.read32(messagePointer + 24); // Max number of files
 	const u32 directoryBucketNum = mem.read32(messagePointer + 28); // Not sure what a directory bucket is...?
 	const u32 fileBucketNum = mem.read32(messagePointer + 32); // Same here
-	const bool duplicateData = mem.read8(messagePointer + 36) != 0; 
+	const bool duplicateData = mem.read8(messagePointer + 36) != 0;
+
+	ArchiveBase::FormatInfo info {
+		.size = blockSize * 0x200,
+		.numOfDirectories = directoryNum,
+		.numOfFiles = fileNum,
+		.duplicateData = duplicateData
+	};
+
+	saveData.format(path, info);
 
-	printf("Stubbed FS::FormatSaveData. File num: %d, directory num: %d\n", fileNum, directoryNum);
 	mem.write32(messagePointer, IPC::responseHeader(0x84C, 1, 0));
 	mem.write32(messagePointer + 4, ResultCode::Success);
 }
 
+void FSService::formatThisUserSaveData(u32 messagePointer) {
+	log("FS::FormatThisUserSaveData\n");
+
+	const u32 blockSize = mem.read32(messagePointer + 4);
+	const u32 directoryNum = mem.read32(messagePointer + 8); // Max number of directories
+	const u32 fileNum = mem.read32(messagePointer + 12); // Max number of files
+	const u32 directoryBucketNum = mem.read32(messagePointer + 16); // Not sure what a directory bucket is...?
+	const u32 fileBucketNum = mem.read32(messagePointer + 20); // Same here
+	const bool duplicateData = mem.read8(messagePointer + 24) != 0;
+
+	ArchiveBase::FormatInfo info {
+		.size = blockSize * 0x200,
+		.numOfDirectories = directoryNum,
+		.numOfFiles = fileNum,
+		.duplicateData = duplicateData
+	};
+	FSPath emptyPath;
+	
+	mem.write32(messagePointer, IPC::responseHeader(0x080F, 1, 0));
+	saveData.format(emptyPath, info);
+}
+
 void FSService::controlArchive(u32 messagePointer) {
 	const Handle archiveHandle = mem.read64(messagePointer + 4);
 	const u32 action = mem.read32(messagePointer + 12);