diff --git a/include/sm_filesystem.h b/include/sm_filesystem.h
index 8017eba..7db68e2 100644
--- a/include/sm_filesystem.h
+++ b/include/sm_filesystem.h
@@ -35,11 +35,13 @@ bool mount_backport_overlay(const char *mount_point,
                             const char *title_id);
 // Unmount all managed /system_ex/app/<title_id> mount stacks on shutdown.
 void shutdown_title_mounts(void);
-// Return true when path is equal to root or is under it.
-bool path_matches_root_or_child(const char *path, const char *root);
 // Remove stale mount links and optionally restore image-backed mounts.
 void cleanup_mount_links(const char *removed_source_root,
                          bool unmount_system_ex_bind);
+// Unmount and remove title links that point under a source root.
+void cleanup_mount_links_for_source_unmount(const char *source_root);
+// Unmount and remove title links backed by USB sources or USB-backed images.
+void cleanup_usb_mount_links_for_suspend(void);
 // Recursively copy a directory tree.
 int copy_dir(const char *src, const char *dst);
 // Copy a single file.
diff --git a/include/sm_image.h b/include/sm_image.h
index a39c691..17c4549 100644
--- a/include/sm_image.h
+++ b/include/sm_image.h
@@ -15,6 +15,8 @@ bool unmount_image(const char *file_path, int unit_id, attach_backend_t backend)
 void cleanup_stale_image_mounts(void);
 // Reconcile cached image mounts that belong to a specific scan root.
 void cleanup_stale_image_mounts_for_root(const char *root);
+// Unmount cached image mounts backed by USB storage during suspend.
+bool unmount_usb_image_mounts_for_suspend(void);
 // Unmount every cached image mount during shutdown.
 bool shutdown_image_mounts(void);
 // Remove empty directories left under the image mount root.
diff --git a/include/sm_path_utils.h b/include/sm_path_utils.h
index 0df1b6d..6a5948a 100644
--- a/include/sm_path_utils.h
+++ b/include/sm_path_utils.h
@@ -12,6 +12,10 @@ const char *get_filename_component(const char *path);
 bool path_exists(const char *path);
 // Return true when a path lives under the image mount root.
 bool is_under_image_mount_base(const char *path);
+// Return true when path is equal to root or is under it.
+bool path_matches_root_or_child(const char *path, const char *root);
+// Return true when a path lives on USB-backed storage.
+bool is_usb_storage_path(const char *path);
 // Build "<scan_path>/backports" for a managed scan root.
 bool build_backports_root_path(const char *scan_path, char out[MAX_PATH]);
 
diff --git a/include/sm_runtime.h b/include/sm_runtime.h
index 9f23f05..597374c 100644
--- a/include/sm_runtime.h
+++ b/include/sm_runtime.h
@@ -13,6 +13,14 @@ pid_t find_pid_by_name(const char *name, bool exclude_self);
 bool should_stop_requested(void);
 // Request graceful shutdown with a descriptive source string.
 void request_shutdown_stop(const char *reason);
+// Return true when the payload is paused for system suspend/resume.
+bool runtime_sleep_mode_active(void);
+// Enter or leave sleep mode with a descriptive source string.
+void request_runtime_sleep_mode(bool active, const char *reason);
+// Return true when scan/remount work is paused by power-state handling.
+bool runtime_scan_blocked(void);
+// Enter or leave scan/remount pause with a descriptive source string.
+void request_runtime_scan_block(bool active, const char *reason);
 // Request an immediate scan cycle with a descriptive source string.
 void request_scan_now(const char *reason);
 // Consume a pending immediate scan request and copy its reason into caller storage.
diff --git a/include/sm_scan.h b/include/sm_scan.h
index ebf479f..bb0fa56 100644
--- a/include/sm_scan.h
+++ b/include/sm_scan.h
@@ -9,6 +9,8 @@ typedef struct scan_candidate scan_candidate_t;
 void cleanup_lost_sources_before_scan(void);
 // Unmount and clean up mounts whose backing sources disappeared under one root.
 void cleanup_lost_sources_for_scan_root(const char *scan_root);
+// Immediately unmount runtime mounts backed by USB storage for suspend.
+void unmount_usb_sources_for_suspend(void);
 // Scan configured roots and collect install candidates.
 int collect_scan_candidates(scan_candidate_t *candidates, int max_candidates,
                             int *total_found_out,
diff --git a/src/main.c b/src/main.c
index 23d6e46..122d37e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -41,6 +41,8 @@
 
 static volatile sig_atomic_t g_stop_requested = 0;
 static atomic_bool g_shutdown_on_going_stop_requested = false;
+static atomic_bool g_runtime_sleep_mode_active = false;
+static atomic_bool g_runtime_scan_blocked = false;
 static _Atomic(uintptr_t) g_shutdown_stop_reason_bits = 0;
 
 typedef struct {
@@ -101,19 +103,75 @@ void request_shutdown_stop(const char *reason) {
   }
   g_stop_requested = 1;
   sm_scanner_wake();
+  wake_game_lifecycle_watcher();
+}
+
+bool runtime_sleep_mode_active(void) {
+  return atomic_load_explicit(&g_runtime_sleep_mode_active,
+                              memory_order_acquire);
+}
+
+bool runtime_scan_blocked(void) {
+  return runtime_sleep_mode_active() ||
+         atomic_load_explicit(&g_runtime_scan_blocked, memory_order_acquire);
+}
+
+static void clear_scan_now_request(void) {
+  pthread_mutex_lock(&g_scan_now.reason_mutex);
+  g_scan_now.reason[0] = '\0';
+  pthread_mutex_unlock(&g_scan_now.reason_mutex);
+}
+
+void request_runtime_sleep_mode(bool active, const char *reason) {
+  bool previous = atomic_exchange_explicit(&g_runtime_sleep_mode_active, active,
+                                           memory_order_acq_rel);
+  if (previous == active)
+    return;
+
+  if (active)
+    clear_scan_now_request();
+
+  const char *resolved_reason =
+      (reason && reason[0] != '\0') ? reason : "unknown sleep source";
+  log_debug("[SLEEP] %s by %s", active ? "entered" : "left",
+            resolved_reason);
+  sm_scanner_wake();
+  wake_game_lifecycle_watcher();
+}
+
+void request_runtime_scan_block(bool active, const char *reason) {
+  bool previous = atomic_exchange_explicit(&g_runtime_scan_blocked, active,
+                                           memory_order_acq_rel);
+  if (previous == active)
+    return;
+
+  if (active)
+    clear_scan_now_request();
+
+  const char *resolved_reason =
+      (reason && reason[0] != '\0') ? reason : "unknown scan block source";
+  log_debug("[SCAN] %s by %s", active ? "paused" : "resumed",
+            resolved_reason);
+  sm_scanner_wake();
 }
 
 void request_scan_now(const char *reason) {
   const char *resolved_reason =
       (reason && reason[0] != '\0') ? reason : "unknown scan source";
+  bool resume_scan =
+      strcmp(resolved_reason, "SceSystemStateMgrInfo=WORKING") == 0;
+  if (runtime_scan_blocked() && !resume_scan)
+    return;
+
   char log_reason[sizeof(g_scan_now.reason)];
-  bool should_log = false;
+  bool should_log = !resume_scan;
 
   pthread_mutex_lock(&g_scan_now.reason_mutex);
   if (g_scan_now.reason[0] == '\0') {
     (void)strlcpy(g_scan_now.reason, resolved_reason, sizeof(g_scan_now.reason));
     (void)strlcpy(log_reason, g_scan_now.reason, sizeof(log_reason));
-    should_log = true;
+  } else {
+    should_log = false;
   }
   pthread_mutex_unlock(&g_scan_now.reason_mutex);
 
diff --git a/src/sm_filesystem.c b/src/sm_filesystem.c
index 3b84a01..42f0ec2 100644
--- a/src/sm_filesystem.c
+++ b/src/sm_filesystem.c
@@ -830,12 +830,21 @@ bool mount_title_nullfs(const char *title_id, const char *src_path) {
       IOVEC_ENTRY("fspath"), IOVEC_ENTRY(dst),
   };
 
+  if (runtime_scan_blocked())
+    return false;
+
   if (nmount(iov, IOVEC_SIZE(iov), 0) != 0) {
     log_debug("  [LINK] Failed to auto-mount nullfs title=%s src=%s dst=%s: %s",
               title_id, src_path, dst, strerror(errno));
     return false;
   }
 
+  if (runtime_scan_blocked()) {
+    if (unmount(dst, 0) != 0 && errno != ENOENT && errno != EINVAL)
+      (void)unmount(dst, MNT_FORCE);
+    return false;
+  }
+
   if (!path_exists(dst_eboot)) {
     log_debug("  [LINK] mounted nullfs but eboot.bin is missing at target: %s",
               dst_eboot);
@@ -851,19 +860,12 @@ bool mount_title_nullfs(const char *title_id, const char *src_path) {
   return true;
 }
 
-bool path_matches_root_or_child(const char *path, const char *root) {
-  if (!path || !root || root[0] == '\0')
-    return false;
-  size_t root_len = strlen(root);
-  if (strncmp(path, root, root_len) != 0)
-    return false;
-  return (path[root_len] == '\0' || path[root_len] == '/');
-}
-
 typedef struct {
   const char *removed_source_root;
   bool unmount_system_ex_bind;
   bool tried_image_recovery;
+  bool force_remove_matching_source;
+  bool match_usb_sources;
 } cleanup_mount_links_ctx_t;
 
 static bool cleanup_mount_links_entry(const char *title_id,
@@ -877,6 +879,8 @@ static bool cleanup_mount_links_entry(const char *title_id,
 
   char source_path[MAX_PATH];
   char image_source_path[MAX_PATH];
+  source_path[0] = '\0';
+  image_source_path[0] = '\0';
   bool has_image_source = false;
   bool should_remove = false;
   bool matches_removed_source = false;
@@ -888,7 +892,14 @@ static bool cleanup_mount_links_entry(const char *title_id,
   }
 
   if (!should_remove) {
-    if (ctx->removed_source_root && ctx->removed_source_root[0] != '\0') {
+    if (ctx->match_usb_sources) {
+      matches_removed_source =
+          is_usb_storage_path(source_path) ||
+          (has_image_source && is_usb_storage_path(image_source_path));
+      if (!matches_removed_source)
+        return true;
+      should_remove = true;
+    } else if (ctx->removed_source_root && ctx->removed_source_root[0] != '\0') {
       matches_removed_source =
           path_matches_root_or_child(source_path, ctx->removed_source_root) ||
           (has_image_source &&
@@ -896,7 +907,8 @@ static bool cleanup_mount_links_entry(const char *title_id,
                                       ctx->removed_source_root));
       if (!matches_removed_source)
         return true;
-      should_remove = (has_image_source && !path_exists(image_source_path)) ||
+      should_remove = ctx->force_remove_matching_source ||
+                      (has_image_source && !path_exists(image_source_path)) ||
                       source_path_needs_cleanup(source_path,
                                                 &ctx->tried_image_recovery);
     } else {
@@ -976,11 +988,40 @@ void cleanup_mount_links(const char *removed_source_root,
       .removed_source_root = removed_source_root,
       .unmount_system_ex_bind = unmount_system_ex_bind,
       .tried_image_recovery = false,
+      .force_remove_matching_source = false,
+      .match_usb_sources = false,
   };
   for_each_title_app_dir("", !unmount_system_ex_bind, cleanup_mount_links_entry,
                          &ctx);
 }
 
+void cleanup_mount_links_for_source_unmount(const char *source_root) {
+  if (!source_root || source_root[0] == '\0')
+    return;
+
+  cleanup_mount_links_ctx_t ctx = {
+      .removed_source_root = source_root,
+      .unmount_system_ex_bind = true,
+      .tried_image_recovery = false,
+      .force_remove_matching_source = true,
+      .match_usb_sources = false,
+  };
+  for_each_title_app_dir(" during source unmount cleanup", false,
+                         cleanup_mount_links_entry, &ctx);
+}
+
+void cleanup_usb_mount_links_for_suspend(void) {
+  cleanup_mount_links_ctx_t ctx = {
+      .removed_source_root = NULL,
+      .unmount_system_ex_bind = true,
+      .tried_image_recovery = false,
+      .force_remove_matching_source = false,
+      .match_usb_sources = true,
+  };
+  for_each_title_app_dir(" during USB suspend cleanup", false,
+                         cleanup_mount_links_entry, &ctx);
+}
+
 static bool shutdown_title_mounts_entry(const char *title_id,
                                         const title_link_paths_t *paths,
                                         void *ctx) {
diff --git a/src/sm_game_lifecycle.c b/src/sm_game_lifecycle.c
index e699e38..437c159 100644
--- a/src/sm_game_lifecycle.c
+++ b/src/sm_game_lifecycle.c
@@ -4,6 +4,7 @@
 #include <pthread.h>
 #include <stdatomic.h>
 #include <sys/event.h>
+#include <sys/select.h>
 
 #include "sm_fakelib.h"
 #include "sm_game_lifecycle.h"
@@ -169,6 +170,31 @@ static void close_game_lifecycle_wake_pipe(void) {
   }
 }
 
+static void drain_game_lifecycle_wake_pipe(void) {
+  char drain_buf[32];
+  while (read(g_game_lifecycle_wake_pipe[0], drain_buf, sizeof(drain_buf)) > 0) {
+  }
+}
+
+static bool discard_game_lifecycle_events_nowait(int kq) {
+  struct kevent events[16];
+  struct timespec timeout;
+  memset(&timeout, 0, sizeof(timeout));
+
+  while (true) {
+    int nev = kevent(kq, NULL, 0, events, sizeof(events) / sizeof(events[0]),
+                     &timeout);
+    if (nev < 0) {
+      if (errno == EINTR)
+        continue;
+      log_debug("  [GAME] stale event drain failed: %s", strerror(errno));
+      return false;
+    }
+    if (nev == 0)
+      return true;
+  }
+}
+
 static bool set_fd_nonblocking(int fd) {
   int flags = fcntl(fd, F_GETFL, 0);
   if (flags < 0)
@@ -375,6 +401,23 @@ static void handle_game_exit(pid_t pid) {
   sm_kstuff_game_on_exit(pid);
 }
 
+static void restore_suspended_game_if_alive(int kq, pid_t pid) {
+  if (pid <= 0 || !is_process_alive(pid))
+    return;
+
+  char title_id[MAX_TITLE_ID];
+  uint32_t app_id = 0;
+  if (!resolve_game_title_id(pid, title_id, &app_id))
+    return;
+  if (!is_supported_title_id(title_id))
+    return;
+
+  uint64_t now_us = monotonic_time_us();
+  log_debug("  [GAME] resumed: %s pid=%ld app_id=0x%08X", title_id,
+            (long)pid, app_id);
+  (void)dispatch_game_launch(kq, pid, now_us, title_id, app_id);
+}
+
 static void *game_lifecycle_watcher_main(void *arg) {
   (void)arg;
 
@@ -415,7 +458,41 @@ static void *game_lifecycle_watcher_main(void *arg) {
   set_game_lifecycle_start_result(true);
   log_debug("  [GAME] lifecycle watcher started");
 
+  bool sleep_cleanup_done = false;
+  pid_t suspended_game_pid = 0;
   while (!g_game_lifecycle_stop_requested && !should_stop_requested()) {
+    if (runtime_sleep_mode_active()) {
+      if (!sleep_cleanup_done) {
+        suspended_game_pid = atomic_load(&g_active_game_pid);
+        clear_all_pending_game_launches();
+        sm_fakelib_game_shutdown();
+        sm_kstuff_game_shutdown();
+        publish_active_game_pid(0);
+        sleep_cleanup_done = true;
+      }
+
+      fd_set readfds;
+      FD_ZERO(&readfds);
+      FD_SET(g_game_lifecycle_wake_pipe[0], &readfds);
+      int rc = select(g_game_lifecycle_wake_pipe[0] + 1, &readfds, NULL, NULL,
+                      NULL);
+      if (rc < 0) {
+        if (errno == EINTR)
+          continue;
+        log_debug("  [GAME] sleep wait failed: %s", strerror(errno));
+        break;
+      }
+      drain_game_lifecycle_wake_pipe();
+      continue;
+    }
+    if (sleep_cleanup_done) {
+      if (!discard_game_lifecycle_events_nowait(kq))
+        break;
+      sleep_cleanup_done = false;
+      restore_suspended_game_if_alive(kq, suspended_game_pid);
+      suspended_game_pid = 0;
+    }
+
     struct kevent event;
     struct timespec timeout;
     const struct timespec *timeout_ptr = compute_game_wait_timeout(&timeout);
@@ -431,9 +508,7 @@ static void *game_lifecycle_watcher_main(void *arg) {
     if (nev > 0) {
       if (event.filter == EVFILT_READ &&
           event.ident == (uintptr_t)g_game_lifecycle_wake_pipe[0]) {
-        char drain_buf[32];
-        (void)read(g_game_lifecycle_wake_pipe[0], drain_buf,
-                   sizeof(drain_buf));
+        drain_game_lifecycle_wake_pipe();
       } else if ((event.fflags & NOTE_TRACKERR) != 0) {
         log_debug("  [GAME] NOTE_TRACKERR for pid=%ld", (long)event.ident);
       } else {
@@ -444,6 +519,8 @@ static void *game_lifecycle_watcher_main(void *arg) {
       }
     }
 
+    if (runtime_sleep_mode_active())
+      continue;
     poll_game_modules(kq);
   }
 
diff --git a/src/sm_image.c b/src/sm_image.c
index b73b462..efdf9f9 100644
--- a/src/sm_image.c
+++ b/src/sm_image.c
@@ -756,6 +756,8 @@ bool mount_image(const char *file_path, image_fs_type_t fs_type) {
     return false;
   if (!stat_image_file(file_path, &st))
     return false;
+  if (runtime_scan_blocked())
+    return false;
 
   log_debug("  [IMG] Mounting image (%s): %s -> %s", image_fs_name(fs_type),
             file_path, mount_point);
@@ -777,10 +779,18 @@ bool mount_image(const char *file_path, image_fs_type_t fs_type) {
                            attach_backend, &unit_id, devname, sizeof(devname))) {
     return false;
   }
+  if (runtime_scan_blocked()) {
+    (void)detach_attached_unit(attach_backend, unit_id);
+    return false;
+  }
   if (!perform_image_nmount(file_path, fs_type, attach_backend, unit_id, devname,
                             mount_point, mount_read_only, force_mount)) {
     return false;
   }
+  if (runtime_scan_blocked()) {
+    (void)unmount_image(file_path, unit_id, attach_backend);
+    return false;
+  }
 
   if (!validate_mounted_image(file_path, fs_type, attach_backend, unit_id,
                               devname, mount_point)) {
@@ -825,7 +835,7 @@ bool unmount_image(const char *file_path, int unit_id, attach_backend_t backend)
 
   // Remove mount.lnk and unmount /system_ex/app/<titleid> that point to this
   // source before unmounting the virtual disk itself.
-  cleanup_mount_links(mount_point, true);
+  cleanup_mount_links_for_source_unmount(mount_point);
   clear_cached_game(mount_point);
 
   // Unmount stacked layers (unionfs over image fs).
@@ -979,6 +989,32 @@ void cleanup_stale_image_mounts_for_root(const char *root) {
   }
 }
 
+bool unmount_usb_image_mounts_for_suspend(void) {
+  bool all_unmounted = true;
+
+  for (int k = 0; k < MAX_IMAGE_MOUNTS; k++) {
+    image_cache_entry_t cached_entry;
+    if (!get_image_cache_entry(k, &cached_entry))
+      continue;
+    if (!is_usb_storage_path(cached_entry.path))
+      continue;
+
+    log_debug("  [IMG][%s] USB suspend unmount: %s",
+              attach_backend_name(cached_entry.backend), cached_entry.path);
+    if (unmount_image(cached_entry.path, cached_entry.unit_id,
+                      cached_entry.backend)) {
+      invalidate_image_cache_entry(k);
+      continue;
+    }
+
+    all_unmounted = false;
+    log_debug("  [IMG][%s] USB suspend unmount pending: %s",
+              attach_backend_name(cached_entry.backend), cached_entry.path);
+  }
+
+  return all_unmounted;
+}
+
 void cleanup_mount_dirs(void) {
   DIR *d = opendir(IMAGE_MOUNT_BASE);
   if (!d) {
diff --git a/src/sm_install.c b/src/sm_install.c
index 39a2542..05c030a 100644
--- a/src/sm_install.c
+++ b/src/sm_install.c
@@ -170,7 +170,7 @@ static bool mount_and_install(const char *src_path, const char *title_id,
   restage_staging = (!is_remount || should_register);
   restage_appmeta = (!is_remount || appmeta_missing);
 
-  if (should_stop_requested())
+  if (should_stop_requested() || runtime_scan_blocked())
     return false;
 
   // COPY FILES
@@ -215,7 +215,7 @@ static bool mount_and_install(const char *src_path, const char *title_id,
     metadata_restaged = true;
   }
 
-  if (should_stop_requested())
+  if (should_stop_requested() || runtime_scan_blocked())
     return false;
 
   if (!mount_title_nullfs(title_id, src_path)) {
@@ -320,10 +320,13 @@ static bool mount_and_install(const char *src_path, const char *title_id,
 // --- Execution (per discovered candidate) ---
 void process_scan_candidates(const scan_candidate_t *candidates,
                              int candidate_count) {
+  if (runtime_scan_blocked())
+    return;
+
   sm_install_poll_pending();
 
   for (int i = 0; i < candidate_count; i++) {
-    if (should_stop_requested())
+    if (should_stop_requested() || runtime_scan_blocked())
       return;
 
     const scan_candidate_t *c = &candidates[i];
@@ -347,7 +350,7 @@ void process_scan_candidates(const scan_candidate_t *candidates,
         if (!sm_install_queue_candidate(c, has_src_snd0)) {
           log_debug("  [REG] Failed to queue staged install: %s (%s)",
                     c->title_name, c->title_id);
-          if (should_stop_requested())
+          if (should_stop_requested() || runtime_scan_blocked())
             return;
 
           uint8_t failed_attempts = bump_failed_mount_attempts(c->title_id);
@@ -365,7 +368,7 @@ void process_scan_candidates(const scan_candidate_t *candidates,
         cache_game_entry(c->path, c->title_id, c->title_name);
       }
     } else {
-      if (should_stop_requested())
+      if (should_stop_requested() || runtime_scan_blocked())
         return;
 
       uint8_t failed_attempts = bump_failed_mount_attempts(c->title_id);
diff --git a/src/sm_install_queue.c b/src/sm_install_queue.c
index a9c2c1d..7240cd4 100644
--- a/src/sm_install_queue.c
+++ b/src/sm_install_queue.c
@@ -7,6 +7,7 @@
 #include "sm_game_cache.h"
 #include "sm_limits.h"
 #include "sm_log.h"
+#include "sm_runtime.h"
 #include "sm_time.h"
 #include "sm_title_state.h"
 
@@ -265,6 +266,9 @@ static void poll_pending_installs(void) {
 }
 
 uint64_t sm_install_next_wake_us(uint64_t now_us) {
+  if (runtime_scan_blocked())
+    return 0;
+
   if (!install_queue_active())
     return 0;
 
@@ -290,10 +294,16 @@ uint64_t sm_install_next_wake_us(uint64_t now_us) {
 }
 
 void sm_install_poll_pending(void) {
+  if (runtime_scan_blocked())
+    return;
+
   poll_pending_installs();
 }
 
 void sm_install_service_pending(void) {
+  if (runtime_scan_blocked())
+    return;
+
   if (!install_queue_active())
     return;
 
@@ -379,6 +389,9 @@ static void drop_queued_install_entry(pending_install_entry_t *entry) {
 }
 
 bool sm_install_submit_queued(void) {
+  if (runtime_scan_blocked())
+    return true;
+
   int queued_count = count_queued_installs();
   if (queued_count <= 0)
     return true;
diff --git a/src/sm_path_utils.c b/src/sm_path_utils.c
index 0f38069..3f22d5e 100644
--- a/src/sm_path_utils.c
+++ b/src/sm_path_utils.c
@@ -20,6 +20,32 @@ bool is_under_image_mount_base(const char *path) {
           path[image_prefix_len] == '/');
 }
 
+bool path_matches_root_or_child(const char *path, const char *root) {
+  if (!path || !root || root[0] == '\0')
+    return false;
+  size_t root_len = strlen(root);
+  if (strncmp(path, root, root_len) != 0)
+    return false;
+  return path[root_len] == '\0' || path[root_len] == '/';
+}
+
+bool is_usb_storage_path(const char *path) {
+  static const char *usb_roots[] = {
+      "/mnt/usb0", "/mnt/usb1", "/mnt/usb2", "/mnt/usb3",
+      "/mnt/usb4", "/mnt/usb5", "/mnt/usb6", "/mnt/usb7",
+      "/mnt/ext0",
+  };
+
+  if (!path || path[0] == '\0')
+    return false;
+
+  for (size_t i = 0; i < sizeof(usb_roots) / sizeof(usb_roots[0]); i++) {
+    if (path_matches_root_or_child(path, usb_roots[i]))
+      return true;
+  }
+  return false;
+}
+
 bool build_backports_root_path(const char *scan_path, char out[MAX_PATH]) {
   if (is_under_image_mount_base(scan_path))
     return false;
diff --git a/src/sm_scan.c b/src/sm_scan.c
index 527d5e8..137a034 100644
--- a/src/sm_scan.c
+++ b/src/sm_scan.c
@@ -489,12 +489,22 @@ void cleanup_lost_sources_for_scan_root(const char *scan_root) {
   prune_path_state_for_root(scan_root);
 }
 
+void unmount_usb_sources_for_suspend(void) {
+  log_debug("[SLEEP] USB-backed mount cleanup begin");
+  cleanup_usb_mount_links_for_suspend();
+  if (!unmount_usb_image_mounts_for_suspend()) {
+    log_debug("[SLEEP] some USB-backed image mounts remain busy");
+  }
+  cleanup_mount_dirs();
+  log_debug("[SLEEP] USB-backed mount cleanup done");
+}
+
 static void collect_scan_candidates_from_root(
     const char *scan_path, scan_candidate_t *candidates, int max_candidates,
     int *candidate_count, const struct AppDbTitleList *app_db_titles,
     bool app_db_titles_ready, char discovered_param_roots[][MAX_PATH],
     int *discovered_param_root_count, bool *unstable_found_out) {
-  if (should_stop_requested())
+  if (should_stop_requested() || runtime_scan_blocked())
     return;
 
   unsigned int scan_depth = runtime_config()->scan_depth;
@@ -557,7 +567,7 @@ int collect_scan_candidates(scan_candidate_t *candidates, int max_candidates,
     log_debug("  [DB] app.db title list unavailable for this scan cycle");
 
   for (int i = 0; i < get_scan_path_count(); i++) {
-    if (should_stop_requested())
+    if (should_stop_requested() || runtime_scan_blocked())
       break;
     collect_scan_candidates_from_root(get_scan_path(i), candidates,
                                       max_candidates,
diff --git a/src/sm_scan_tree.c b/src/sm_scan_tree.c
index 162f266..5f9e6f4 100644
--- a/src/sm_scan_tree.c
+++ b/src/sm_scan_tree.c
@@ -47,7 +47,7 @@ bool sm_scan_tree_walk(const char *scan_root, const char *dir_path,
                        unsigned int depth_from_root,
                        unsigned int remaining_depth,
                        const sm_scan_tree_callbacks_t *callbacks, void *ctx) {
-  if (should_stop_requested())
+  if (should_stop_requested() || runtime_scan_blocked())
     return true;
 
   if (depth_from_root > 0u &&
@@ -79,7 +79,7 @@ bool sm_scan_tree_walk(const char *scan_root, const char *dir_path,
 
   struct dirent *entry;
   while ((entry = readdir(d)) != NULL) {
-    if (should_stop_requested()) {
+    if (should_stop_requested() || runtime_scan_blocked()) {
       closedir(d);
       return true;
     }
diff --git a/src/sm_scanner.c b/src/sm_scanner.c
index 7f9b050..dfe03aa 100644
--- a/src/sm_scanner.c
+++ b/src/sm_scanner.c
@@ -3,6 +3,7 @@
 #include <fcntl.h>
 #include <stdlib.h>
 #include <sys/event.h>
+#include <sys/select.h>
 
 #include "sm_config_mount.h"
 #include "sm_fakelib.h"
@@ -886,7 +887,7 @@ static void apply_runtime_config_reload_effects(const runtime_config_t *old_cfg,
 }
 
 static bool should_abort_scan_cycle(void) {
-  return should_stop_requested();
+  return should_stop_requested() || runtime_scan_blocked();
 }
 
 static bool run_full_scan_cycle(bool startup_sync, const char *reason,
@@ -937,7 +938,7 @@ static bool run_full_scan_cycle(bool startup_sync, const char *reason,
                        total_found_games);
   }
 
-  return !should_stop_requested();
+  return !should_abort_scan_cycle();
 }
 
 static bool run_targeted_scan_cycle(int scan_root_index,
@@ -971,7 +972,7 @@ static bool run_targeted_scan_cycle(int scan_root_index,
   if (unstable_found_out)
     *unstable_found_out = unstable_found;
 
-  return !should_stop_requested();
+  return !should_abort_scan_cycle();
 }
 
 static int find_pending_cleanup_scan_root(void) {
@@ -1177,6 +1178,24 @@ static bool drain_scanner_events_nowait(int kq) {
   return true;
 }
 
+static bool discard_scanner_events_nowait(int kq) {
+  struct kevent events[SCANNER_EVENT_BATCH];
+  struct timespec timeout;
+  memset(&timeout, 0, sizeof(timeout));
+
+  while (true) {
+    int nev = kevent(kq, NULL, 0, events, SCANNER_EVENT_BATCH, &timeout);
+    if (nev < 0) {
+      if (errno == EINTR)
+        continue;
+      log_debug("  [SCAN] stale event drain failed: %s", strerror(errno));
+      return false;
+    }
+    if (nev == 0)
+      return true;
+  }
+}
+
 static char g_scanner_shutdown_reason[128];
 
 static void request_scanner_shutdown(const char *reason) {
@@ -1237,10 +1256,19 @@ void sm_scanner_wake(void) {
 }
 
 bool sm_scanner_run_startup_sync(void) {
-  if (should_stop_requested())
-    return false;
+  while (!should_stop_requested()) {
+    while (runtime_scan_blocked() && !should_stop_requested())
+      sceKernelUsleep(200000);
 
-  return run_full_scan_cycle(true, NULL, NULL);
+    if (should_stop_requested())
+      return false;
+    if (run_full_scan_cycle(true, NULL, NULL))
+      return true;
+    if (!runtime_scan_blocked())
+      return false;
+  }
+
+  return false;
 }
 
 void sm_scanner_run_loop(void) {
@@ -1281,6 +1309,7 @@ void sm_scanner_run_loop(void) {
 
   uint64_t next_full_resync_us =
       monotonic_time_us() + scanner_full_resync_interval_us();
+  bool was_sleeping = false;
 
   while (true) {
     if (should_stop_requested()) {
@@ -1288,11 +1317,42 @@ void sm_scanner_run_loop(void) {
       break;
     }
 
+    if (runtime_scan_blocked()) {
+      was_sleeping = true;
+      fd_set readfds;
+      FD_ZERO(&readfds);
+      FD_SET(g_scanner_wake_pipe[0], &readfds);
+      int rc = select(g_scanner_wake_pipe[0] + 1, &readfds, NULL, NULL, NULL);
+      if (rc < 0) {
+        if (errno == EINTR)
+          continue;
+        log_debug("  [SCAN] sleep wait failed: %s", strerror(errno));
+        close(kq);
+        clear_scanner_watch_entries();
+        request_scanner_shutdown("scanner sleep wait failed");
+        return;
+      }
+      drain_scanner_wake_pipe();
+      continue;
+    }
+    if (was_sleeping) {
+      was_sleeping = false;
+      if (!discard_scanner_events_nowait(kq)) {
+        close(kq);
+        clear_scanner_watch_entries();
+        request_scanner_shutdown("scanner stale event drain failed");
+        return;
+      }
+    }
+
     char scan_reason[128];
     if (consume_scan_now_request(scan_reason, sizeof(scan_reason))) {
       bool unstable_found = false;
-      if (!run_full_scan_cycle(false, scan_reason, &unstable_found))
+      if (!run_full_scan_cycle(false, scan_reason, &unstable_found)) {
+        if (runtime_scan_blocked())
+          continue;
         break;
+      }
       clear_all_dirty_scan_roots();
       if (!rebuild_all_scan_root_watch_trees(kq) ||
           !drain_scanner_events_nowait(kq)) {
@@ -1354,8 +1414,11 @@ void sm_scanner_run_loop(void) {
 
     if (next_full_resync_us != 0 && now_us >= next_full_resync_us) {
       bool unstable_found = false;
-      if (!run_full_scan_cycle(false, NULL, &unstable_found))
+      if (!run_full_scan_cycle(false, NULL, &unstable_found)) {
+        if (runtime_scan_blocked())
+          continue;
         break;
+      }
       clear_all_dirty_scan_roots();
       if (!rebuild_all_scan_root_watch_trees(kq) ||
           !drain_scanner_events_nowait(kq)) {
@@ -1384,6 +1447,8 @@ void sm_scanner_run_loop(void) {
 
     int dirty_root_index = find_due_dirty_scan_root(now_us);
     if (dirty_root_index >= 0) {
+      bool cleanup_pending =
+          g_scanner_root_states[dirty_root_index].cleanup_pending;
       bool rebuild_watch_tree =
           g_scanner_root_states[dirty_root_index].watch_tree_stale;
       uint8_t rebuild_watch_tree_depth =
@@ -1401,8 +1466,25 @@ void sm_scanner_run_loop(void) {
       clear_scan_root_watch_tree_state(dirty_root_index);
 
       bool unstable_found = false;
-      if (!run_targeted_scan_cycle(dirty_root_index, &unstable_found))
+      if (!run_targeted_scan_cycle(dirty_root_index, &unstable_found)) {
+        if (runtime_scan_blocked()) {
+          scanner_root_state_t *state =
+              &g_scanner_root_states[dirty_root_index];
+          if (cleanup_pending)
+            schedule_scan_root_cleanup(dirty_root_index);
+          schedule_scan_root_dirty(dirty_root_index, monotonic_time_us(), true);
+          if (rebuild_watch_tree) {
+            state->watch_tree_stale = true;
+            state->watch_tree_rebuild_depth = rebuild_watch_tree_depth;
+            state->watch_tree_rebuild_kind = rebuild_watch_tree_kind;
+            (void)strlcpy(state->watch_tree_rebuild_path,
+                          rebuild_watch_tree_path,
+                          sizeof(state->watch_tree_rebuild_path));
+          }
+          continue;
+        }
         break;
+      }
 
       if (rebuild_watch_tree &&
           !rebuild_scan_root_watch_subtree(kq, dirty_root_index,
diff --git a/src/sm_shellcore_flags.c b/src/sm_shellcore_flags.c
index 7d5f724..144fa78 100644
--- a/src/sm_shellcore_flags.c
+++ b/src/sm_shellcore_flags.c
@@ -7,6 +7,7 @@
 #include "sm_limits.h"
 #include "sm_log.h"
 #include "sm_runtime.h"
+#include "sm_scan.h"
 #include "sm_shellcore_flags.h"
 
 #define SHELLCORE_FLAG_WAITMODE_OR 2u
@@ -610,6 +611,8 @@ static void poll_shellcore_flag(shellcore_flag_monitor_t *flag) {
   int rc;
   bool changed = false;
   bool entered_shutdown_on_going = false;
+  bool entered_main_on_standby = false;
+  bool entered_suspend_on_going = false;
   bool entered_resume_working = false;
   bool is_system_state_mgr_info = false;
   unsigned current_state = 0;
@@ -646,6 +649,14 @@ static void poll_shellcore_flag(shellcore_flag_monitor_t *flag) {
         current_state == SYSTEM_STATE_MGR_STATE_SHUTDOWN_ON_GOING &&
         (!flag->has_last_pattern ||
          previous_state != SYSTEM_STATE_MGR_STATE_SHUTDOWN_ON_GOING);
+    entered_main_on_standby =
+        current_state == SYSTEM_STATE_MGR_STATE_MAIN_ON_STANDBY &&
+        (!flag->has_last_pattern ||
+         previous_state != SYSTEM_STATE_MGR_STATE_MAIN_ON_STANDBY);
+    entered_suspend_on_going =
+        current_state == SYSTEM_STATE_MGR_STATE_SUSPEND_ON_GOING &&
+        (!flag->has_last_pattern ||
+         previous_state != SYSTEM_STATE_MGR_STATE_SUSPEND_ON_GOING);
     entered_resume_working =
         flag->has_last_pattern &&
         current_state == SYSTEM_STATE_MGR_STATE_WORKING &&
@@ -664,8 +675,17 @@ static void poll_shellcore_flag(shellcore_flag_monitor_t *flag) {
   if (entered_shutdown_on_going) {
     request_shutdown_stop("SceSystemStateMgrInfo=SHUTDOWN_ON_GOING");
   }
+  if (entered_main_on_standby) {
+    request_runtime_scan_block(true, "SceSystemStateMgrInfo=MAIN_ON_STANDBY");
+    unmount_usb_sources_for_suspend();
+  }
+  if (entered_suspend_on_going) {
+    request_runtime_sleep_mode(true, "SceSystemStateMgrInfo=SUSPEND_ON_GOING");
+  }
   if (entered_resume_working) {
     request_scan_now("SceSystemStateMgrInfo=WORKING");
+    request_runtime_sleep_mode(false, "SceSystemStateMgrInfo=WORKING");
+    request_runtime_scan_block(false, "SceSystemStateMgrInfo=WORKING");
   }
 }