diff --git a/externals/dynarmic b/externals/dynarmic
index f7d11baa1c..990a569b7a 160000
--- a/externals/dynarmic
+++ b/externals/dynarmic
@@ -1 +1 @@
-Subproject commit f7d11baa1cba82f7926058bebdeb6b1c23cff8eb
+Subproject commit 990a569b7a5f2518fe08682f5ebf8536e5388d66
diff --git a/src/common/common_paths.h b/src/common/common_paths.h
index 9bf3efaf27..70f6d410a7 100644
--- a/src/common/common_paths.h
+++ b/src/common/common_paths.h
@@ -30,7 +30,7 @@
 #define CONFIG_DIR "config"
 #define CACHE_DIR "cache"
 #define SDMC_DIR "sdmc"
-#define NAND_DIR "nand"
+#define SAVE_DIR "save"
 #define SYSDATA_DIR "sysdata"
 #define LOG_DIR "log"
 
diff --git a/src/common/file_util.cpp b/src/common/file_util.cpp
index 7213abe18d..39f6d07009 100644
--- a/src/common/file_util.cpp
+++ b/src/common/file_util.cpp
@@ -711,7 +711,7 @@ const std::string& GetUserPath(const unsigned int DirIDX, const std::string& new
         }
 #endif
         paths[D_SDMC_IDX] = paths[D_USER_IDX] + SDMC_DIR DIR_SEP;
-        paths[D_NAND_IDX] = paths[D_USER_IDX] + NAND_DIR DIR_SEP;
+        paths[D_SAVE_IDX] = paths[D_USER_IDX] + SAVE_DIR DIR_SEP;
         paths[D_SYSDATA_IDX] = paths[D_USER_IDX] + SYSDATA_DIR DIR_SEP;
         // TODO: Put the logs in a better location for each OS
         paths[D_LOGS_IDX] = paths[D_USER_IDX] + LOG_DIR DIR_SEP;
@@ -735,7 +735,7 @@ const std::string& GetUserPath(const unsigned int DirIDX, const std::string& new
             paths[D_CONFIG_IDX] = paths[D_USER_IDX] + CONFIG_DIR DIR_SEP;
             paths[D_CACHE_IDX] = paths[D_USER_IDX] + CACHE_DIR DIR_SEP;
             paths[D_SDMC_IDX] = paths[D_USER_IDX] + SDMC_DIR DIR_SEP;
-            paths[D_NAND_IDX] = paths[D_USER_IDX] + NAND_DIR DIR_SEP;
+            paths[D_SAVE_IDX] = paths[D_USER_IDX] + SAVE_DIR DIR_SEP;
             break;
         }
     }
diff --git a/src/common/file_util.h b/src/common/file_util.h
index 5bc7fbf7c5..73670d893e 100644
--- a/src/common/file_util.h
+++ b/src/common/file_util.h
@@ -23,7 +23,7 @@ enum {
     D_CONFIG_IDX,
     D_CACHE_IDX,
     D_SDMC_IDX,
-    D_NAND_IDX,
+    D_SAVE_IDX,
     D_SYSDATA_IDX,
     D_LOGS_IDX,
     NUM_PATH_INDICES
diff --git a/src/core/file_sys/filesystem.h b/src/core/file_sys/filesystem.h
index 295a3133e7..1a32a373b5 100644
--- a/src/core/file_sys/filesystem.h
+++ b/src/core/file_sys/filesystem.h
@@ -167,35 +167,4 @@ public:
     virtual ResultVal<EntryType> GetEntryType(const std::string& path) const = 0;
 };
 
-class FileSystemFactory : NonCopyable {
-public:
-    virtual ~FileSystemFactory() {}
-
-    /**
-     * Get a descriptive name for the archive (e.g. "RomFS", "SaveData", etc.)
-     */
-    virtual std::string GetName() const = 0;
-
-    /**
-     * Tries to open the archive of this type with the specified path
-     * @param path Path to the archive
-     * @return An ArchiveBackend corresponding operating specified archive path.
-     */
-    virtual ResultVal<std::unique_ptr<FileSystemBackend>> Open(const Path& path) = 0;
-
-    /**
-     * Deletes the archive contents and then re-creates the base folder
-     * @param path Path to the archive
-     * @return ResultCode of the operation, 0 on success
-     */
-    virtual ResultCode Format(const Path& path) = 0;
-
-    /**
-     * Retrieves the format info about the archive with the specified path
-     * @param path Path to the archive
-     * @return Format information about the archive or error code
-     */
-    virtual ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const = 0;
-};
-
 } // namespace FileSys
diff --git a/src/core/file_sys/romfs_factory.cpp b/src/core/file_sys/romfs_factory.cpp
index 84ae0d99b3..946fc0452f 100644
--- a/src/core/file_sys/romfs_factory.cpp
+++ b/src/core/file_sys/romfs_factory.cpp
@@ -11,28 +11,17 @@
 
 namespace FileSys {
 
-RomFS_Factory::RomFS_Factory(Loader::AppLoader& app_loader) {
+RomFSFactory::RomFSFactory(Loader::AppLoader& app_loader) {
     // Load the RomFS from the app
     if (Loader::ResultStatus::Success != app_loader.ReadRomFS(romfs_file, data_offset, data_size)) {
         LOG_ERROR(Service_FS, "Unable to read RomFS!");
     }
 }
 
-ResultVal<std::unique_ptr<FileSystemBackend>> RomFS_Factory::Open(const Path& path) {
+ResultVal<std::unique_ptr<FileSystemBackend>> RomFSFactory::Open(u64 title_id) {
+    // TODO(DarkLordZach): Use title id.
     auto archive = std::make_unique<RomFS_FileSystem>(romfs_file, data_offset, data_size);
     return MakeResult<std::unique_ptr<FileSystemBackend>>(std::move(archive));
 }
 
-ResultCode RomFS_Factory::Format(const Path& path) {
-    LOG_ERROR(Service_FS, "Unimplemented Format archive {}", GetName());
-    // TODO(bunnei): Find the right error code for this
-    return ResultCode(-1);
-}
-
-ResultVal<ArchiveFormatInfo> RomFS_Factory::GetFormatInfo(const Path& path) const {
-    LOG_ERROR(Service_FS, "Unimplemented GetFormatInfo archive {}", GetName());
-    // TODO(bunnei): Find the right error code for this
-    return ResultCode(-1);
-}
-
 } // namespace FileSys
diff --git a/src/core/file_sys/romfs_factory.h b/src/core/file_sys/romfs_factory.h
index e0698e6429..c9e20c3ab1 100644
--- a/src/core/file_sys/romfs_factory.h
+++ b/src/core/file_sys/romfs_factory.h
@@ -15,16 +15,11 @@
 namespace FileSys {
 
 /// File system interface to the RomFS archive
-class RomFS_Factory final : public FileSystemFactory {
+class RomFSFactory {
 public:
-    explicit RomFS_Factory(Loader::AppLoader& app_loader);
+    explicit RomFSFactory(Loader::AppLoader& app_loader);
 
-    std::string GetName() const override {
-        return "ArchiveFactory_RomFS";
-    }
-    ResultVal<std::unique_ptr<FileSystemBackend>> Open(const Path& path) override;
-    ResultCode Format(const Path& path) override;
-    ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
+    ResultVal<std::unique_ptr<FileSystemBackend>> Open(u64 title_id);
 
 private:
     std::shared_ptr<FileUtil::IOFile> romfs_file;
diff --git a/src/core/file_sys/savedata_factory.cpp b/src/core/file_sys/savedata_factory.cpp
index f3aa213af9..89a8aad211 100644
--- a/src/core/file_sys/savedata_factory.cpp
+++ b/src/core/file_sys/savedata_factory.cpp
@@ -12,11 +12,20 @@
 
 namespace FileSys {
 
-SaveData_Factory::SaveData_Factory(std::string nand_directory)
-    : nand_directory(std::move(nand_directory)) {}
+std::string SaveStructDebugInfo(SaveStruct save_struct) {
+    return fmt::format("[type={:02X}, title_id={:016X}, user_id={:016X}{:016X}, save_id={:016X}]",
+                       static_cast<u8>(save_struct.type), save_struct.title_id,
+                       save_struct.user_id[1], save_struct.user_id[0], save_struct.save_id);
+}
 
-ResultVal<std::unique_ptr<FileSystemBackend>> SaveData_Factory::Open(const Path& path) {
-    std::string save_directory = GetFullPath();
+SaveDataFactory::SaveDataFactory(std::string save_directory)
+    : save_directory(std::move(save_directory)) {}
+
+ResultVal<std::unique_ptr<FileSystemBackend>> SaveDataFactory::Open(SaveDataSpaceId space,
+
+                                                                    SaveStruct meta) {
+    std::string save_directory =
+        GetFullPath(space, meta.type, meta.title_id, meta.user_id, meta.save_id);
 
     if (!FileUtil::Exists(save_directory)) {
         // TODO(bunnei): This is a work-around to always create a save data directory if it does not
@@ -36,10 +45,12 @@ ResultVal<std::unique_ptr<FileSystemBackend>> SaveData_Factory::Open(const Path&
     return MakeResult<std::unique_ptr<FileSystemBackend>>(std::move(archive));
 }
 
-ResultCode SaveData_Factory::Format(const Path& path) {
-    LOG_WARNING(Service_FS, "Format archive {}", GetName());
+ResultCode SaveDataFactory::Format(SaveDataSpaceId space, SaveStruct meta) {
+    LOG_WARNING(Service_FS, "Formatting save data of space={:01X}, meta={}", static_cast<u8>(space),
+                SaveStructDebugInfo(meta));
     // Create the save data directory.
-    if (!FileUtil::CreateFullPath(GetFullPath())) {
+    if (!FileUtil::CreateFullPath(
+            GetFullPath(space, meta.type, meta.title_id, meta.user_id, meta.save_id))) {
         // TODO(Subv): Find the correct error code.
         return ResultCode(-1);
     }
@@ -47,17 +58,18 @@ ResultCode SaveData_Factory::Format(const Path& path) {
     return RESULT_SUCCESS;
 }
 
-ResultVal<ArchiveFormatInfo> SaveData_Factory::GetFormatInfo(const Path& path) const {
-    LOG_ERROR(Service_FS, "Unimplemented GetFormatInfo archive {}", GetName());
-    // TODO(bunnei): Find the right error code for this
-    return ResultCode(-1);
-}
+std::string SaveDataFactory::GetFullPath(SaveDataSpaceId space, SaveDataType type, u64 title_id,
+                                         u128 user_id, u64 save_id) const {
+    static std::vector<std::string> space_names = {"sysnand", "usrnand", "sd", "temp"};
+    static std::vector<std::string> type_names = {"system", "user", "bcat",
+                                                  "device", "temp", "cache"};
 
-std::string SaveData_Factory::GetFullPath() const {
-    u64 title_id = Core::CurrentProcess()->program_id;
-    // TODO(Subv): Somehow obtain this value.
-    u32 user = 0;
-    return fmt::format("{}save/{:016X}/{:08X}/", nand_directory, title_id, user);
+    if (type == SaveDataType::SaveData && title_id == 0)
+        title_id = Core::CurrentProcess()->program_id;
+
+    return fmt::format("{}{}/{}/{:016X}/{:016X}{:016X}/{:016X}", save_directory,
+                       space_names[static_cast<u8>(space)], type_names[static_cast<u8>(type)],
+                       title_id, user_id[1], user_id[0], save_id);
 }
 
 } // namespace FileSys
diff --git a/src/core/file_sys/savedata_factory.h b/src/core/file_sys/savedata_factory.h
index 73a42aab6e..1850b4bdc3 100644
--- a/src/core/file_sys/savedata_factory.h
+++ b/src/core/file_sys/savedata_factory.h
@@ -12,22 +12,41 @@
 
 namespace FileSys {
 
-/// File system interface to the SaveData archive
-class SaveData_Factory final : public FileSystemFactory {
-public:
-    explicit SaveData_Factory(std::string nand_directory);
+enum class SaveDataSpaceId : u8 { NandSystem = 0, NandUser = 1, SdCard = 2, TemporaryStorage = 3 };
 
-    std::string GetName() const override {
-        return "SaveData_Factory";
-    }
-    ResultVal<std::unique_ptr<FileSystemBackend>> Open(const Path& path) override;
-    ResultCode Format(const Path& path) override;
-    ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
+enum class SaveDataType : u8 {
+    SystemSaveData = 0,
+    SaveData = 1,
+    BcatDeliveryCacheStorage = 2,
+    DeviceSaveData = 3,
+    TemporaryStorage = 4,
+    CacheStorage = 5
+};
+
+struct SaveStruct {
+    u64 title_id;
+    u128 user_id;
+    u64 save_id;
+    SaveDataType type;
+    INSERT_PADDING_BYTES(31);
+};
+static_assert(sizeof(SaveStruct) == 0x40, "SaveStruct has incorrect size.");
+
+std::string SaveStructDebugInfo(SaveStruct save_struct);
+
+/// File system interface to the SaveData archive
+class SaveDataFactory {
+public:
+    explicit SaveDataFactory(std::string save_directory);
+
+    ResultVal<std::unique_ptr<FileSystemBackend>> Open(SaveDataSpaceId space, SaveStruct meta);
+    ResultCode Format(SaveDataSpaceId space, SaveStruct meta);
 
 private:
-    std::string nand_directory;
+    std::string save_directory;
 
-    std::string GetFullPath() const;
+    std::string GetFullPath(SaveDataSpaceId space, SaveDataType type, u64 title_id, u128 user_id,
+                            u64 save_id) const;
 };
 
 } // namespace FileSys
diff --git a/src/core/file_sys/sdmc_factory.cpp b/src/core/file_sys/sdmc_factory.cpp
index 2e5ffb764e..ac6f2f9710 100644
--- a/src/core/file_sys/sdmc_factory.cpp
+++ b/src/core/file_sys/sdmc_factory.cpp
@@ -12,9 +12,9 @@
 
 namespace FileSys {
 
-SDMC_Factory::SDMC_Factory(std::string sd_directory) : sd_directory(std::move(sd_directory)) {}
+SDMCFactory::SDMCFactory(std::string sd_directory) : sd_directory(std::move(sd_directory)) {}
 
-ResultVal<std::unique_ptr<FileSystemBackend>> SDMC_Factory::Open(const Path& path) {
+ResultVal<std::unique_ptr<FileSystemBackend>> SDMCFactory::Open() {
     // Create the SD Card directory if it doesn't already exist.
     if (!FileUtil::IsDirectory(sd_directory)) {
         FileUtil::CreateFullPath(sd_directory);
@@ -24,16 +24,4 @@ ResultVal<std::unique_ptr<FileSystemBackend>> SDMC_Factory::Open(const Path& pat
     return MakeResult<std::unique_ptr<FileSystemBackend>>(std::move(archive));
 }
 
-ResultCode SDMC_Factory::Format(const Path& path) {
-    LOG_ERROR(Service_FS, "Unimplemented Format archive {}", GetName());
-    // TODO(Subv): Find the right error code for this
-    return ResultCode(-1);
-}
-
-ResultVal<ArchiveFormatInfo> SDMC_Factory::GetFormatInfo(const Path& path) const {
-    LOG_ERROR(Service_FS, "Unimplemented GetFormatInfo archive {}", GetName());
-    // TODO(bunnei): Find the right error code for this
-    return ResultCode(-1);
-}
-
 } // namespace FileSys
diff --git a/src/core/file_sys/sdmc_factory.h b/src/core/file_sys/sdmc_factory.h
index 93becda255..09bec7fced 100644
--- a/src/core/file_sys/sdmc_factory.h
+++ b/src/core/file_sys/sdmc_factory.h
@@ -13,16 +13,11 @@
 namespace FileSys {
 
 /// File system interface to the SDCard archive
-class SDMC_Factory final : public FileSystemFactory {
+class SDMCFactory {
 public:
-    explicit SDMC_Factory(std::string sd_directory);
+    explicit SDMCFactory(std::string sd_directory);
 
-    std::string GetName() const override {
-        return "SDMC_Factory";
-    }
-    ResultVal<std::unique_ptr<FileSystemBackend>> Open(const Path& path) override;
-    ResultCode Format(const Path& path) override;
-    ResultVal<ArchiveFormatInfo> GetFormatInfo(const Path& path) const override;
+    ResultVal<std::unique_ptr<FileSystemBackend>> Open();
 
 private:
     std::string sd_directory;
diff --git a/src/core/hle/service/am/am.cpp b/src/core/hle/service/am/am.cpp
index a871b3eaa0..b201fcaad1 100644
--- a/src/core/hle/service/am/am.cpp
+++ b/src/core/hle/service/am/am.cpp
@@ -616,15 +616,18 @@ void IApplicationFunctions::EnsureSaveData(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     u128 uid = rp.PopRaw<u128>();
 
+    FileSys::SaveDataSpaceId space = FileSys::SaveDataSpaceId::NandUser;
+    FileSys::SaveStruct save_struct = {};
+
     LOG_WARNING(Service, "(STUBBED) called uid = {:016X}{:016X}", uid[1], uid[0]);
 
     IPC::ResponseBuilder rb{ctx, 4};
 
     FileSys::Path unused;
-    auto savedata = FileSystem::OpenFileSystem(FileSystem::Type::SaveData, unused);
+    auto savedata = FileSystem::OpenSaveData(space, save_struct);
     if (savedata.Failed()) {
         // Create the save data and return an error indicating that the operation was performed.
-        FileSystem::FormatFileSystem(FileSystem::Type::SaveData);
+        FileSystem::FormatSaveData(space, save_struct);
         // TODO(Subv): Find out the correct error code for this.
         rb.Push(ResultCode(ErrorModule::FS, 40));
     } else {
diff --git a/src/core/hle/service/filesystem/filesystem.cpp b/src/core/hle/service/filesystem/filesystem.cpp
index f58b518b62..4077e2399f 100644
--- a/src/core/hle/service/filesystem/filesystem.cpp
+++ b/src/core/hle/service/filesystem/filesystem.cpp
@@ -16,57 +16,91 @@ namespace Service::FileSystem {
  * Map of registered file systems, identified by type. Once an file system is registered here, it
  * is never removed until UnregisterFileSystems is called.
  */
-static boost::container::flat_map<Type, std::unique_ptr<FileSys::FileSystemFactory>> filesystem_map;
+static std::unique_ptr<FileSys::RomFSFactory> romfs;
+static std::unique_ptr<FileSys::SaveDataFactory> save_data;
+static std::unique_ptr<FileSys::SDMCFactory> sdmc;
 
-ResultCode RegisterFileSystem(std::unique_ptr<FileSys::FileSystemFactory>&& factory, Type type) {
-    auto result = filesystem_map.emplace(type, std::move(factory));
-
-    bool inserted = result.second;
-    ASSERT_MSG(inserted, "Tried to register more than one system with same id code");
-
-    auto& filesystem = result.first->second;
-    LOG_DEBUG(Service_FS, "Registered file system {} with id code 0x{:08X}", filesystem->GetName(),
-              static_cast<u32>(type));
+ResultCode RegisterRomFS(std::unique_ptr<FileSys::RomFSFactory>&& factory) {
+    ASSERT_MSG(romfs == nullptr, "Tried to register a second RomFS");
+    romfs = std::move(factory);
+    LOG_DEBUG(Service_FS, "Registered RomFS");
     return RESULT_SUCCESS;
 }
 
-ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenFileSystem(Type type,
-                                                                      FileSys::Path& path) {
-    LOG_TRACE(Service_FS, "Opening FileSystem with type={}", static_cast<u32>(type));
-
-    auto itr = filesystem_map.find(type);
-    if (itr == filesystem_map.end()) {
-        // TODO(bunnei): Find a better error code for this
-        return ResultCode(-1);
-    }
-
-    return itr->second->Open(path);
+ResultCode RegisterSaveData(std::unique_ptr<FileSys::SaveDataFactory>&& factory) {
+    ASSERT_MSG(romfs == nullptr, "Tried to register a second save data");
+    save_data = std::move(factory);
+    LOG_DEBUG(Service_FS, "Registered save data");
+    return RESULT_SUCCESS;
 }
 
-ResultCode FormatFileSystem(Type type) {
-    LOG_TRACE(Service_FS, "Formatting FileSystem with type={}", static_cast<u32>(type));
+ResultCode RegisterSDMC(std::unique_ptr<FileSys::SDMCFactory>&& factory) {
+    ASSERT_MSG(romfs == nullptr, "Tried to register a second SDMC");
+    sdmc = std::move(factory);
+    LOG_DEBUG(Service_FS, "Registered SDMC");
+    return RESULT_SUCCESS;
+}
 
-    auto itr = filesystem_map.find(type);
-    if (itr == filesystem_map.end()) {
+ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenRomFS(u64 title_id) {
+    LOG_TRACE(Service_FS, "Opening RomFS for title_id={:016X}", title_id);
+
+    if (romfs == nullptr) {
         // TODO(bunnei): Find a better error code for this
         return ResultCode(-1);
     }
 
-    FileSys::Path unused;
-    return itr->second->Format(unused);
+    return romfs->Open(title_id);
+}
+
+ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenSaveData(
+    FileSys::SaveDataSpaceId space, FileSys::SaveStruct save_struct) {
+    LOG_TRACE(Service_FS, "Opening Save Data for space_id={:01X}, save_struct={}",
+              static_cast<u8>(space), SaveStructDebugInfo(save_struct));
+
+    if (save_data == nullptr) {
+        // TODO(bunnei): Find a better error code for this
+        return ResultCode(-1);
+    }
+
+    return save_data->Open(space, save_struct);
+}
+
+ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenSDMC() {
+    LOG_TRACE(Service_FS, "Opening SDMC");
+
+    if (romfs == nullptr) {
+        // TODO(bunnei): Find a better error code for this
+        return ResultCode(-1);
+    }
+
+    return sdmc->Open();
+}
+
+ResultCode FormatSaveData(FileSys::SaveDataSpaceId space, FileSys::SaveStruct save_struct) {
+    LOG_TRACE(Service_FS, "Formatting Save Data for space_id={:01X}, save_struct={}",
+              static_cast<u8>(space), SaveStructDebugInfo(save_struct));
+
+    if (save_data == nullptr) {
+        // TODO(bunnei): Find a better error code for this
+        return ResultCode(-1);
+    }
+
+    return save_data->Format(space, save_struct);
 }
 
 void RegisterFileSystems() {
-    filesystem_map.clear();
+    romfs = nullptr;
+    save_data = nullptr;
+    sdmc = nullptr;
 
-    std::string nand_directory = FileUtil::GetUserPath(D_NAND_IDX);
+    std::string save_directory = FileUtil::GetUserPath(D_SAVE_IDX);
     std::string sd_directory = FileUtil::GetUserPath(D_SDMC_IDX);
 
-    auto savedata = std::make_unique<FileSys::SaveData_Factory>(std::move(nand_directory));
-    RegisterFileSystem(std::move(savedata), Type::SaveData);
+    auto savedata = std::make_unique<FileSys::SaveDataFactory>(std::move(save_directory));
+    RegisterSaveData(std::move(savedata));
 
-    auto sdcard = std::make_unique<FileSys::SDMC_Factory>(std::move(sd_directory));
-    RegisterFileSystem(std::move(sdcard), Type::SDMC);
+    auto sdcard = std::make_unique<FileSys::SDMCFactory>(std::move(sd_directory));
+    RegisterSDMC(std::move(sdcard));
 }
 
 void InstallInterfaces(SM::ServiceManager& service_manager) {
diff --git a/src/core/hle/service/filesystem/filesystem.h b/src/core/hle/service/filesystem/filesystem.h
index 56d26146e9..86a57f29d9 100644
--- a/src/core/hle/service/filesystem/filesystem.h
+++ b/src/core/hle/service/filesystem/filesystem.h
@@ -6,12 +6,13 @@
 
 #include <memory>
 #include "common/common_types.h"
+#include "core/file_sys/romfs_factory.h"
+#include "core/file_sys/savedata_factory.h"
+#include "core/file_sys/sdmc_factory.h"
 #include "core/hle/result.h"
 
 namespace FileSys {
 class FileSystemBackend;
-class FileSystemFactory;
-class Path;
 } // namespace FileSys
 
 namespace Service {
@@ -22,35 +23,22 @@ class ServiceManager;
 
 namespace FileSystem {
 
-/// Supported FileSystem types
-enum class Type {
-    RomFS = 1,
-    SaveData = 2,
-    SDMC = 3,
-};
+ResultCode RegisterRomFS(std::unique_ptr<FileSys::RomFSFactory>&& factory);
+ResultCode RegisterSaveData(std::unique_ptr<FileSys::SaveDataFactory>&& factory);
+ResultCode RegisterSDMC(std::unique_ptr<FileSys::SDMCFactory>&& factory);
 
-/**
- * Registers a FileSystem, instances of which can later be opened using its IdCode.
- * @param factory FileSystem backend interface to use
- * @param type Type used to access this type of FileSystem
- */
-ResultCode RegisterFileSystem(std::unique_ptr<FileSys::FileSystemFactory>&& factory, Type type);
+// TODO(DarkLordZach): BIS Filesystem
+// ResultCode RegisterBIS(std::unique_ptr<FileSys::BISFactory>&& factory);
 
-/**
- * Opens a file system
- * @param type Type of the file system to open
- * @param path Path to the file system, used with Binary paths
- * @return FileSys::FileSystemBackend interface to the file system
- */
-ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenFileSystem(Type type,
-                                                                      FileSys::Path& path);
+ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenRomFS(u64 title_id);
+ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenSaveData(
+    FileSys::SaveDataSpaceId space, FileSys::SaveStruct save_struct);
+ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenSDMC();
 
-/**
- * Formats a file system
- * @param type Type of the file system to format
- * @return ResultCode of the operation
- */
-ResultCode FormatFileSystem(Type type);
+// TODO(DarkLordZach): BIS Filesystem
+// ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenBIS();
+
+ResultCode FormatSaveData(FileSys::SaveDataSpaceId space, FileSys::SaveStruct save_struct);
 
 /// Registers all Filesystem services with the specified service manager.
 void InstallInterfaces(SM::ServiceManager& service_manager);
diff --git a/src/core/hle/service/filesystem/fsp_srv.cpp b/src/core/hle/service/filesystem/fsp_srv.cpp
index 82efe7f7db..555cc0e2f4 100644
--- a/src/core/hle/service/filesystem/fsp_srv.cpp
+++ b/src/core/hle/service/filesystem/fsp_srv.cpp
@@ -13,11 +13,21 @@
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/client_port.h"
 #include "core/hle/kernel/client_session.h"
+#include "core/hle/kernel/process.h"
 #include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/filesystem/fsp_srv.h"
 
 namespace Service::FileSystem {
 
+enum class StorageId : u8 {
+    None = 0,
+    Host = 1,
+    GameCard = 2,
+    NandSystem = 3,
+    NandUser = 4,
+    SdCard = 5
+};
+
 class IStorage final : public ServiceFramework<IStorage> {
 public:
     IStorage(std::unique_ptr<FileSys::StorageBackend>&& backend)
@@ -487,17 +497,6 @@ FSP_SRV::FSP_SRV() : ServiceFramework("fsp-srv") {
     RegisterHandlers(functions);
 }
 
-void FSP_SRV::TryLoadRomFS() {
-    if (romfs) {
-        return;
-    }
-    FileSys::Path unused;
-    auto res = OpenFileSystem(Type::RomFS, unused);
-    if (res.Succeeded()) {
-        romfs = std::move(res.Unwrap());
-    }
-}
-
 void FSP_SRV::Initialize(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_FS, "(STUBBED) called");
 
@@ -509,7 +508,7 @@ void FSP_SRV::MountSdCard(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_FS, "called");
 
     FileSys::Path unused;
-    auto filesystem = OpenFileSystem(Type::SDMC, unused).Unwrap();
+    auto filesystem = OpenSDMC().Unwrap();
 
     IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
@@ -530,12 +529,12 @@ void FSP_SRV::CreateSaveData(Kernel::HLERequestContext& ctx) {
 }
 
 void FSP_SRV::MountSaveData(Kernel::HLERequestContext& ctx) {
-    LOG_WARNING(Service_FS, "(STUBBED) called");
+    IPC::RequestParser rp{ctx};
 
-    // TODO(Subv): Read the input parameters and mount the requested savedata instead of always
-    // mounting the current process' savedata.
-    FileSys::Path unused;
-    auto filesystem = OpenFileSystem(Type::SaveData, unused);
+    auto space_id = rp.PopRaw<FileSys::SaveDataSpaceId>();
+    auto save_struct = rp.PopRaw<FileSys::SaveStruct>();
+
+    auto filesystem = OpenSaveData(space_id, save_struct);
 
     if (filesystem.Failed()) {
         IPC::ResponseBuilder rb{ctx, 2, 0, 0};
@@ -559,8 +558,8 @@ void FSP_SRV::GetGlobalAccessLogMode(Kernel::HLERequestContext& ctx) {
 void FSP_SRV::OpenDataStorageByCurrentProcess(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_FS, "called");
 
-    TryLoadRomFS();
-    if (!romfs) {
+    auto romfs = OpenRomFS(Core::System::GetInstance().CurrentProcess()->program_id);
+    if (romfs.Failed()) {
         // TODO (bunnei): Find the right error code to use here
         LOG_CRITICAL(Service_FS, "no file system interface available!");
         IPC::ResponseBuilder rb{ctx, 2};
@@ -568,8 +567,8 @@ void FSP_SRV::OpenDataStorageByCurrentProcess(Kernel::HLERequestContext& ctx) {
         return;
     }
 
-    // Attempt to open a StorageBackend interface to the RomFS
-    auto storage = romfs->OpenFile({}, {});
+    auto storage = romfs.Unwrap()->OpenFile({}, {});
+
     if (storage.Failed()) {
         LOG_CRITICAL(Service_FS, "no storage interface available!");
         IPC::ResponseBuilder rb{ctx, 2};
@@ -583,8 +582,35 @@ void FSP_SRV::OpenDataStorageByCurrentProcess(Kernel::HLERequestContext& ctx) {
 }
 
 void FSP_SRV::OpenRomStorage(Kernel::HLERequestContext& ctx) {
-    LOG_WARNING(Service_FS, "(STUBBED) called, using OpenDataStorageByCurrentProcess");
-    OpenDataStorageByCurrentProcess(ctx);
+    IPC::RequestParser rp{ctx};
+
+    auto storage_id = rp.PopRaw<StorageId>();
+    auto title_id = rp.PopRaw<u64>();
+
+    LOG_DEBUG(Service_FS, "called with storage_id={:02X}, title_id={:016X}",
+              static_cast<u8>(storage_id), title_id);
+
+    auto romfs = OpenRomFS(title_id);
+    if (romfs.Failed()) {
+        // TODO (bunnei): Find the right error code to use here
+        LOG_CRITICAL(Service_FS, "no file system interface available!");
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultCode(-1));
+        return;
+    }
+
+    auto storage = romfs.Unwrap()->OpenFile({}, {});
+
+    if (storage.Failed()) {
+        LOG_CRITICAL(Service_FS, "no storage interface available!");
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(storage.Code());
+        return;
+    }
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(RESULT_SUCCESS);
+    rb.PushIpcInterface<IStorage>(std::move(storage.Unwrap()));
 }
 
 } // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp_srv.h b/src/core/hle/service/filesystem/fsp_srv.h
index acb78fac12..4653eee4e5 100644
--- a/src/core/hle/service/filesystem/fsp_srv.h
+++ b/src/core/hle/service/filesystem/fsp_srv.h
@@ -19,8 +19,6 @@ public:
     ~FSP_SRV() = default;
 
 private:
-    void TryLoadRomFS();
-
     void Initialize(Kernel::HLERequestContext& ctx);
     void MountSdCard(Kernel::HLERequestContext& ctx);
     void CreateSaveData(Kernel::HLERequestContext& ctx);
diff --git a/src/core/loader/deconstructed_rom_directory.cpp b/src/core/loader/deconstructed_rom_directory.cpp
index 5fdb1d2893..0b11bf4f3a 100644
--- a/src/core/loader/deconstructed_rom_directory.cpp
+++ b/src/core/loader/deconstructed_rom_directory.cpp
@@ -154,8 +154,7 @@ ResultStatus AppLoader_DeconstructedRomDirectory::Load(
 
     // Register the RomFS if a ".romfs" file was found
     if (!filepath_romfs.empty()) {
-        Service::FileSystem::RegisterFileSystem(std::make_unique<FileSys::RomFS_Factory>(*this),
-                                                Service::FileSystem::Type::RomFS);
+        Service::FileSystem::RegisterRomFS(std::make_unique<FileSys::RomFSFactory>(*this));
     }
 
     is_loaded = true;
diff --git a/src/core/loader/nca.cpp b/src/core/loader/nca.cpp
index 0fd930ae20..b463f369c4 100644
--- a/src/core/loader/nca.cpp
+++ b/src/core/loader/nca.cpp
@@ -277,8 +277,7 @@ ResultStatus AppLoader_NCA::Load(Kernel::SharedPtr<Kernel::Process>& process) {
                  metadata.GetMainThreadStackSize());
 
     if (nca->GetRomFsSize() > 0)
-        Service::FileSystem::RegisterFileSystem(std::make_unique<FileSys::RomFS_Factory>(*this),
-                                                Service::FileSystem::Type::RomFS);
+        Service::FileSystem::RegisterRomFS(std::make_unique<FileSys::RomFSFactory>(*this));
 
     is_loaded = true;
     return ResultStatus::Success;
diff --git a/src/core/loader/nso.cpp b/src/core/loader/nso.cpp
index 1c629e21f3..7b3d6b8375 100644
--- a/src/core/loader/nso.cpp
+++ b/src/core/loader/nso.cpp
@@ -115,7 +115,7 @@ VAddr AppLoader_NSO::LoadModule(const std::string& name, const std::vector<u8>&
     std::vector<u8> program_image;
     for (int i = 0; i < nso_header.segments.size(); ++i) {
         std::vector<u8> compressed_data(nso_header.segments_compressed_size[i]);
-        for (int j = 0; j < nso_header.segments_compressed_size[i]; ++j)
+        for (auto j = 0; j < nso_header.segments_compressed_size[i]; ++j)
             compressed_data[j] = file_data[nso_header.segments[i].offset + j];
         std::vector<u8> data = DecompressSegment(compressed_data, nso_header.segments[i]);
         program_image.resize(nso_header.segments[i].location);