diff --git a/crates/ecstore/src/cluster/rpc/client.rs b/crates/ecstore/src/cluster/rpc/client.rs
index d06caadbb..435cbf64c 100644
--- a/crates/ecstore/src/cluster/rpc/client.rs
+++ b/crates/ecstore/src/cluster/rpc/client.rs
@@ -678,7 +678,9 @@ mod tests {
     fn embedded_tonic_status_is_recovered_across_error_conversions() {
         // DiskError and StorageError share one wrapper, so a status keeps its
         // typed classification whichever error it was converted into first.
-        let from_storage: DiskErrorType = crate::error::Error::from(tonic::Status::unavailable("peer gone")).into();
+        let from_storage: DiskErrorType = crate::error::Error::from(tonic::Status::unavailable("peer gone"))
+            .narrow_to_disk()
+            .expect("status-derived Io errors narrow through the bridge");
         let DiskError::Io(io_err) = &from_storage else {
             panic!("status-derived disk error should stay an Io error");
         };
diff --git a/crates/ecstore/src/cluster/rpc/peer_rest_client.rs b/crates/ecstore/src/cluster/rpc/peer_rest_client.rs
index a655ed595..a3ebe48aa 100644
--- a/crates/ecstore/src/cluster/rpc/peer_rest_client.rs
+++ b/crates/ecstore/src/cluster/rpc/peer_rest_client.rs
@@ -3593,13 +3593,23 @@ mod tests {
         // reduce_errs groups Io errors by kind plus rendered message: peers failing the
         // same operation must stay a single dominant error instead of one bucket per peer.
         let per_peer_errs = (0..4)
-            .map(|_| Some(DiskError::from(peer_failure_without_details("load_bucket_metadata", Some("shared")))))
+            .map(|_| {
+                Some(
+                    peer_failure_without_details("load_bucket_metadata", Some("shared"))
+                        .narrow_to_disk()
+                        .unwrap_or_else(DiskError::other),
+                )
+            })
             .collect::<Vec<_>>();
         let (count, dominant) = reduce_errs(&per_peer_errs, &[]);
         assert_eq!(count, 4, "one shared failure must not split into per-peer buckets");
         assert_eq!(
             dominant,
-            Some(DiskError::from(peer_failure_without_details("load_bucket_metadata", Some("shared"))))
+            Some(
+                peer_failure_without_details("load_bucket_metadata", Some("shared"))
+                    .narrow_to_disk()
+                    .unwrap_or_else(DiskError::other)
+            )
         );
 
         assert_ne!(
diff --git a/crates/ecstore/src/cluster/rpc/peer_s3_client.rs b/crates/ecstore/src/cluster/rpc/peer_s3_client.rs
index 840cc5d28..cbd944fb0 100644
--- a/crates/ecstore/src/cluster/rpc/peer_s3_client.rs
+++ b/crates/ecstore/src/cluster/rpc/peer_s3_client.rs
@@ -775,9 +775,10 @@ fn try_acquire_bucket_heal_movement_guard<'a>(
     };
     // Do not queue a receiver behind a movement writer while its coordinator
     // holds another node's read guard; failing fast breaks that cross-node cycle.
-    gate.try_read()
-        .map(Some)
-        .map_err(|_| crate::error::StorageError::SlowDown.into())
+    // `StorageError::SlowDown` has no disk-layer identity of its own: it
+    // collapses to `TooManyOpenFiles` at this boundary (see `narrow_to_disk`).
+    // Constructed directly so the loss stays explicit at the site.
+    gate.try_read().map(Some).map_err(|_| Error::TooManyOpenFiles)
 }
 
 async fn acquire_bucket_heal_write_guard<'a>(
@@ -787,7 +788,9 @@ async fn acquire_bucket_heal_write_guard<'a>(
         return Ok(None);
     };
     let guard = gate.lock().await;
-    guard.ensure_write_safe("bucket heal cannot run while pool metadata requires recovery")?;
+    guard
+        .ensure_write_safe("bucket heal cannot run while pool metadata requires recovery")
+        .map_err(|e| e.narrow_to_disk().unwrap_or_else(Error::other))?;
     Ok(Some(guard))
 }
 
@@ -2366,7 +2369,11 @@ mod tests {
 
         let err = try_acquire_bucket_heal_movement_guard(Some(&gate), false)
             .expect_err("receiver must not wait behind a queued movement writer");
-        assert_eq!(err, crate::error::StorageError::SlowDown.into());
+        assert_eq!(
+            err,
+            Error::TooManyOpenFiles,
+            "SlowDown collapses to TooManyOpenFiles at the disk boundary"
+        );
         assert!(
             try_acquire_bucket_heal_movement_guard(Some(&gate), true)
                 .expect("coordinator-owned movement guard should be reused")
diff --git a/crates/ecstore/src/disk/error.rs b/crates/ecstore/src/disk/error.rs
index 326e38952..6f771f790 100644
--- a/crates/ecstore/src/disk/error.rs
+++ b/crates/ecstore/src/disk/error.rs
@@ -351,7 +351,7 @@ impl From<std::io::Error> for DiskError {
             // classification instead of degrading to `DiskError::Io`, which
             // quorum aggregation (`reduce_errs`) would count as a distinct error.
             Err(io_error) => match io_error.downcast::<crate::error::StorageError>() {
-                Ok(storage_error) => storage_error.into(),
+                Ok(storage_error) => storage_error.narrow_to_disk().unwrap_or_else(DiskError::other),
                 Err(io_error) => DiskError::Io(io_error),
             },
         }
@@ -1189,7 +1189,7 @@ mod tests {
             &storage,
             crate::error::StorageError::RemoteClientUnavailable(detail) if detail == "handshake timed out"
         ));
-        let narrowed: DiskError = storage.into();
+        let narrowed: DiskError = storage.narrow_to_disk().expect("typed variant must narrow");
         assert_eq!(narrowed, original);
         assert!(matches!(
             &narrowed,
diff --git a/crates/ecstore/src/disk/local.rs b/crates/ecstore/src/disk/local.rs
index e6fe0cd26..3d591a06d 100644
--- a/crates/ecstore/src/disk/local.rs
+++ b/crates/ecstore/src/disk/local.rs
@@ -5096,7 +5096,7 @@ impl LocalDisk {
 
         ensure_data_usage_layout(&io_root)
             .await
-            .map_err(DiskError::from)
+            .map_err(|e| e.narrow_to_disk().unwrap_or_else(DiskError::other))
             .inspect_err(|err| {
                 log_startup_disk_error("ensure_data_usage_layout", &root, err);
             })?;
diff --git a/crates/ecstore/src/error/conversion_roundtrip_tests.rs b/crates/ecstore/src/error/conversion_roundtrip_tests.rs
index fd7c606b4..6602ad76f 100644
--- a/crates/ecstore/src/error/conversion_roundtrip_tests.rs
+++ b/crates/ecstore/src/error/conversion_roundtrip_tests.rs
@@ -49,7 +49,7 @@ fn heal_matched_disk_variants() -> Vec<DiskError> {
 fn disk_to_storage_to_disk_preserves_heal_matched_variants() {
     for disk_err in heal_matched_disk_variants() {
         let storage: StorageError = disk_err.clone().into();
-        let back: DiskError = storage.into();
+        let back: DiskError = storage.narrow_to_disk().expect("heal-matched variants must narrow");
         assert_eq!(back, disk_err, "DiskError → StorageError → DiskError must be identity for {disk_err:?}");
     }
 }
@@ -63,7 +63,10 @@ fn storage_to_disk_to_storage_preserves_heal_matched_variants() {
         StorageError::ErasureWriteQuorum,
     ];
     for storage_err in variants {
-        let disk: DiskError = storage_err.clone().into();
+        let disk: DiskError = storage_err
+            .clone()
+            .narrow_to_disk()
+            .expect("heal-matched variants must narrow");
         let back: StorageError = disk.into();
         assert_eq!(
             back, storage_err,
@@ -77,11 +80,11 @@ fn storage_to_disk_to_storage_preserves_heal_matched_variants() {
 /// A classifier on the far side of the disk boundary can no longer tell
 /// backpressure ("please slow down") apart from fd exhaustion.
 ///
-/// Pinned as-is for backlog#1845; PR4's fallible `narrow_to_disk()` is the
-/// planned place to surface this loss explicitly.
+/// The fallible `narrow_to_disk()` keeps this collapse as a documented arm;
+/// only variants with no disk-layer identity at all narrow to `Err`.
 #[test]
 fn slowdown_collapses_to_too_many_open_files_across_disk_boundary() {
-    let disk: DiskError = StorageError::SlowDown.into();
+    let disk: DiskError = StorageError::SlowDown.narrow_to_disk().expect("SlowDown narrows, lossily");
     assert_eq!(disk, DiskError::TooManyOpenFiles);
 
     let back: StorageError = disk.into();
@@ -96,7 +99,9 @@ fn slowdown_collapses_to_too_many_open_files_across_disk_boundary() {
 /// and comes back as `DiskFull`.
 #[test]
 fn storage_full_collapses_to_disk_full_across_disk_boundary() {
-    let disk: DiskError = StorageError::StorageFull.into();
+    let disk: DiskError = StorageError::StorageFull
+        .narrow_to_disk()
+        .expect("StorageFull narrows, lossily");
     assert_eq!(disk, DiskError::DiskFull);
 
     let back: StorageError = disk.into();
@@ -204,7 +209,10 @@ fn storage_to_filemeta_to_storage_preserves_matched_variants() {
         StorageError::Unexpected,
     ];
     for storage_err in variants {
-        let filemeta: rustfs_filemeta::Error = storage_err.clone().into();
+        let filemeta: rustfs_filemeta::Error = storage_err
+            .clone()
+            .narrow_to_filemeta()
+            .expect("matched variants must narrow");
         let back: StorageError = filemeta.into();
         assert_eq!(
             back, storage_err,
@@ -219,7 +227,13 @@ fn storage_to_filemeta_to_storage_preserves_matched_variants() {
 /// recovers identity" property of the by-design bridge stays load-bearing.
 #[test]
 fn storage_to_filemeta_other_recovers_identity_via_io_bridge() {
-    let filemeta: rustfs_filemeta::Error = StorageError::SlowDown.into();
+    // A variant with no filemeta identity narrows to Err; callers that need a
+    // total conversion fold it into the io-backed other(), and the identity
+    // bridge recovers the boxed StorageError on the way back.
+    let refused = StorageError::SlowDown
+        .narrow_to_filemeta()
+        .expect_err("SlowDown has no filemeta identity");
+    let filemeta = rustfs_filemeta::Error::other(refused);
     assert!(
         matches!(filemeta, rustfs_filemeta::Error::Io(_)),
         "unmatched variants fold into the io-backed other()"
diff --git a/crates/ecstore/src/error/mod.rs b/crates/ecstore/src/error/mod.rs
index 4845efa3e..a7e78d972 100644
--- a/crates/ecstore/src/error/mod.rs
+++ b/crates/ecstore/src/error/mod.rs
@@ -327,9 +327,20 @@ impl From<DiskError> for StorageError {
     }
 }
 
-impl From<StorageError> for DiskError {
-    fn from(val: StorageError) -> Self {
-        match val {
+impl StorageError {
+    /// Narrow a store-layer error to the disk-layer vocabulary.
+    ///
+    /// This used to be a blanket `impl From<StorageError> for DiskError`, which
+    /// let `?` silently push store-only errors across the disk boundary into
+    /// `DiskError::other`, fragmenting `reduce_errs` quorum buckets
+    /// (backlog#1845). Narrowing is now a named, fallible operation: variants
+    /// with a disk-layer identity map across (including two documented lossy
+    /// collapses kept for compatibility — `SlowDown` → `TooManyOpenFiles` and
+    /// `StorageFull` → `DiskFull`, pinned by conversion_roundtrip_tests), and
+    /// everything else comes back as `Err(self)` so the caller decides what
+    /// crossing the boundary means for it.
+    pub fn narrow_to_disk(self) -> core::result::Result<DiskError, StorageError> {
+        Ok(match self {
             StorageError::Io(io_error) => io_error.into(),
             StorageError::Unexpected => DiskError::Unexpected,
             StorageError::FileNotFound => DiskError::FileNotFound,
@@ -375,8 +386,26 @@ impl From<StorageError> for DiskError {
             StorageError::VolumeAccessDenied => DiskError::VolumeAccessDenied,
             StorageError::FileAccessDenied => DiskError::FileAccessDenied,
             StorageError::RemoteClientUnavailable(detail) => DiskError::RemoteClientUnavailable(detail),
-            _ => DiskError::other(val),
-        }
+            val => return Err(val),
+        })
+    }
+
+    /// Same contract as [`StorageError::narrow_to_disk`], for the
+    /// `rustfs_filemeta::Error` vocabulary (formerly a blanket `From` impl
+    /// with an `other()` catch-all). No production path currently narrows in
+    /// this direction; the named form keeps future callers deliberate.
+    pub fn narrow_to_filemeta(self) -> core::result::Result<rustfs_filemeta::Error, StorageError> {
+        Ok(match self {
+            StorageError::Unexpected => rustfs_filemeta::Error::Unexpected,
+            StorageError::FileNotFound => rustfs_filemeta::Error::FileNotFound,
+            StorageError::FileVersionNotFound => rustfs_filemeta::Error::FileVersionNotFound,
+            StorageError::FileCorrupt => rustfs_filemeta::Error::FileCorrupt,
+            StorageError::DoneForNow => rustfs_filemeta::Error::DoneForNow,
+            StorageError::MethodNotAllowed => rustfs_filemeta::Error::MethodNotAllowed,
+            StorageError::VolumeNotFound => rustfs_filemeta::Error::VolumeNotFound,
+            StorageError::Io(io_error) => io_error.into(),
+            val => return Err(val),
+        })
     }
 }
 
@@ -433,22 +462,6 @@ impl From<rustfs_filemeta::Error> for StorageError {
     }
 }
 
-impl From<StorageError> for rustfs_filemeta::Error {
-    fn from(val: StorageError) -> Self {
-        match val {
-            StorageError::Unexpected => rustfs_filemeta::Error::Unexpected,
-            StorageError::FileNotFound => rustfs_filemeta::Error::FileNotFound,
-            StorageError::FileVersionNotFound => rustfs_filemeta::Error::FileVersionNotFound,
-            StorageError::FileCorrupt => rustfs_filemeta::Error::FileCorrupt,
-            StorageError::DoneForNow => rustfs_filemeta::Error::DoneForNow,
-            StorageError::MethodNotAllowed => rustfs_filemeta::Error::MethodNotAllowed,
-            StorageError::VolumeNotFound => rustfs_filemeta::Error::VolumeNotFound,
-            StorageError::Io(io_error) => io_error.into(),
-            _ => rustfs_filemeta::Error::other(val),
-        }
-    }
-}
-
 impl PartialEq for StorageError {
     fn eq(&self, other: &Self) -> bool {
         match (self, other) {
@@ -1438,7 +1451,9 @@ mod tests {
 
         for original in all_variants {
             let storage_error: StorageError = original.clone().into();
-            let round_tripped: DiskError = storage_error.into();
+            let round_tripped: DiskError = storage_error
+                .narrow_to_disk()
+                .expect("every disk-representable StorageError must narrow back");
 
             assert_eq!(
                 std::mem::discriminant(&original),
@@ -1452,7 +1467,7 @@ mod tests {
         // message must both survive the round trip.
         let io_original = DiskError::Io(IoError::new(ErrorKind::PermissionDenied, "denied"));
         let storage_error: StorageError = io_original.clone().into();
-        let io_round_tripped: DiskError = storage_error.into();
+        let io_round_tripped: DiskError = storage_error.narrow_to_disk().expect("Io narrows through the bridge");
         assert_eq!(io_original, io_round_tripped);
         match io_round_tripped {
             DiskError::Io(inner) => {
@@ -1700,8 +1715,13 @@ mod tests {
             assert_eq!(converted_storage_error, expected_storage_error);
 
             // Test reverse conversion
-            let converted_back: rustfs_filemeta::Error = converted_storage_error.into();
-            assert_eq!(converted_back, expected_storage_error.into());
+            let converted_back: rustfs_filemeta::Error = converted_storage_error
+                .narrow_to_filemeta()
+                .expect("matched variants must narrow to filemeta");
+            let expected_back: rustfs_filemeta::Error = expected_storage_error
+                .narrow_to_filemeta()
+                .expect("matched variants must narrow to filemeta");
+            assert_eq!(converted_back, expected_back);
         }
     }
 
diff --git a/crates/ecstore/src/set_disk/ops/heal.rs b/crates/ecstore/src/set_disk/ops/heal.rs
index 62ada21f1..adcea3a60 100644
--- a/crates/ecstore/src/set_disk/ops/heal.rs
+++ b/crates/ecstore/src/set_disk/ops/heal.rs
@@ -474,13 +474,15 @@ impl SetDisks {
         // Bound, not `_`: this guard must live to the end of the scope. A bare
         // `_` would drop it here and release the namespace write lock.
         let _write_lock_guard = if !opts.no_lock {
-            let ns_lock = self.new_ns_lock(bucket, object).await?;
-            Some(
-                ns_lock
-                    .get_write_lock(get_lock_acquire_timeout())
-                    .await
-                    .map_err(|e| self.map_namespace_lock_error(bucket, object, "write", e))?,
-            )
+            let ns_lock = self
+                .new_ns_lock(bucket, object)
+                .await
+                .map_err(|e| e.narrow_to_disk().unwrap_or_else(DiskError::other))?;
+            Some(ns_lock.get_write_lock(get_lock_acquire_timeout()).await.map_err(|e| {
+                self.map_namespace_lock_error(bucket, object, "write", e)
+                    .narrow_to_disk()
+                    .unwrap_or_else(DiskError::other)
+            })?)
         } else {
             None
         };
@@ -2200,13 +2202,15 @@ impl crate::storage_api_contracts::heal::HealOperations for SetDisks {
         opts: &HealOpts,
     ) -> Result<(HealResultItem, Option<Error>)> {
         let _write_lock_guard = if !opts.no_lock {
-            let ns_lock = self.new_ns_lock(bucket, object).await?;
-            Some(
-                ns_lock
-                    .get_write_lock(get_lock_acquire_timeout())
-                    .await
-                    .map_err(|e| self.map_namespace_lock_error(bucket, object, "write", e))?,
-            )
+            let ns_lock = self
+                .new_ns_lock(bucket, object)
+                .await
+                .map_err(|e| e.narrow_to_disk().unwrap_or_else(DiskError::other))?;
+            Some(ns_lock.get_write_lock(get_lock_acquire_timeout()).await.map_err(|e| {
+                self.map_namespace_lock_error(bucket, object, "write", e)
+                    .narrow_to_disk()
+                    .unwrap_or_else(DiskError::other)
+            })?)
         } else {
             None
         };
@@ -2306,13 +2310,15 @@ impl crate::storage_api_contracts::heal::HealOperations for SetDisks {
     async fn check_abandoned_parts(&self, bucket: &str, object: &str, opts: &HealOpts) -> Result<()> {
         let started_at = std::time::Instant::now();
         let _write_lock_guard = if !opts.no_lock {
-            let ns_lock = self.new_ns_lock(bucket, object).await?;
-            Some(
-                ns_lock
-                    .get_write_lock(get_lock_acquire_timeout())
-                    .await
-                    .map_err(|e| self.map_namespace_lock_error(bucket, object, "write", e))?,
-            )
+            let ns_lock = self
+                .new_ns_lock(bucket, object)
+                .await
+                .map_err(|e| e.narrow_to_disk().unwrap_or_else(DiskError::other))?;
+            Some(ns_lock.get_write_lock(get_lock_acquire_timeout()).await.map_err(|e| {
+                self.map_namespace_lock_error(bucket, object, "write", e)
+                    .narrow_to_disk()
+                    .unwrap_or_else(DiskError::other)
+            })?)
         } else {
             None
         };
diff --git a/crates/ecstore/src/set_disk/ops/object.rs b/crates/ecstore/src/set_disk/ops/object.rs
index 30a1e30a4..2de84eaae 100644
--- a/crates/ecstore/src/set_disk/ops/object.rs
+++ b/crates/ecstore/src/set_disk/ops/object.rs
@@ -2205,7 +2205,7 @@ impl SetDisks {
         }
         let current = read_object_transaction_epoch_fence(self, bucket, object)
             .await
-            .map_err(DiskError::from)?;
+            .map_err(|e| e.narrow_to_disk().unwrap_or_else(DiskError::other))?;
         let disks = self.get_disks_internal().await;
         let mut removed = 0usize;
 
diff --git a/crates/ecstore/src/store/heal.rs b/crates/ecstore/src/store/heal.rs
index da18546eb..5eed710c6 100644
--- a/crates/ecstore/src/store/heal.rs
+++ b/crates/ecstore/src/store/heal.rs
@@ -659,7 +659,7 @@ mod tests {
             let _movement_guard = self
                 .movement_gate
                 .try_read()
-                .map_err(|_| crate::error::StorageError::SlowDown)?;
+                .map_err(|_| crate::disk::error::DiskError::TooManyOpenFiles)?;
             Ok(HealResultItem::default())
         }
 
diff --git a/crates/ecstore/src/store/list_objects.rs b/crates/ecstore/src/store/list_objects.rs
index 5b18481d7..683e9eeb3 100644
--- a/crates/ecstore/src/store/list_objects.rs
+++ b/crates/ecstore/src/store/list_objects.rs
@@ -12,6 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+/// Narrow a store error into the filemeta vocabulary for `MetaCacheEntriesSortedResult.err`.
+/// Faithful port of the retired blanket `From<StorageError> for rustfs_filemeta::Error`:
+/// unmatched variants fold into the io-backed `other()`, whose boxed identity the io bridge
+/// recovers on the way back (see conversion_roundtrip_tests).
+fn to_filemeta_err(err: Error) -> rustfs_filemeta::Error {
+    err.narrow_to_filemeta().unwrap_or_else(rustfs_filemeta::Error::other)
+}
+
 use crate::bucket::metadata_sys::{get_versioning_config, has_authoritative_never_versioned_state};
 use crate::bucket::utils::check_list_objs_args;
 use crate::bucket::versioning::VersioningApi;
@@ -3162,7 +3170,7 @@ impl ECStore {
                 .list_path(&page_opts)
                 .await
                 .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                    err: Some(err.into()),
+                    err: Some(to_filemeta_err(err)),
                     ..Default::default()
                 });
             let reached_end = match list_result.err.take() {
@@ -3525,7 +3533,7 @@ impl ECStore {
                         .list_path(&provider_opts)
                         .await
                         .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                            err: Some(err.into()),
+                            err: Some(to_filemeta_err(err)),
                             ..Default::default()
                         });
 
@@ -3788,7 +3796,7 @@ impl ECStore {
             .list_path(&opts)
             .await
             .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                err: Some(err.into()),
+                err: Some(to_filemeta_err(err)),
                 ..Default::default()
             });
         let next_cache_id = list_result.entries.as_ref().and_then(|entries| entries.list_id.clone());
@@ -3928,7 +3936,7 @@ impl ECStore {
             .list_path(&opts)
             .await
             .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                err: Some(err.into()),
+                err: Some(to_filemeta_err(err)),
                 ..Default::default()
             });
         let next_cache_id = list_result.entries.as_ref().and_then(|entries| entries.list_id.clone());
@@ -4109,7 +4117,7 @@ impl ECStore {
                 match res{
                     Ok(err) => {
                         log_list_path_worker_error("store", "worker_error", &log_context, err.as_ref());
-                        MetaCacheEntriesSortedResult{ entries: None, err: Some(err.as_ref().clone().into()) }
+                        MetaCacheEntriesSortedResult{ entries: None, err: Some(to_filemeta_err(err.as_ref().clone())) }
                     },
                     Err(err) => {
                         log_list_path_worker_error("store", "error_channel_closed", &log_context, &err);
@@ -4129,7 +4137,7 @@ impl ECStore {
 
         if let Ok(err) = err_rx.try_recv() {
             log_list_path_worker_error("store", "trailing_worker_error", &log_context, err.as_ref());
-            result.err = Some(err.as_ref().clone().into());
+            result.err = Some(to_filemeta_err(err.as_ref().clone()));
         }
 
         if result.err.is_some() {
@@ -4150,7 +4158,7 @@ impl ECStore {
             }
 
             if !truncated {
-                result.err = Some(Error::Unexpected.into());
+                result.err = Some(rustfs_filemeta::Error::Unexpected);
             }
         }
 
@@ -4350,7 +4358,7 @@ impl ECStore {
                     let reader_disks = disks.len();
 
                     let path = base_dir_from_prefix(prefix);
-                    ensure_non_empty_listing_disks(bucket, &path, &disks)?;
+                    ensure_non_empty_listing_disks(bucket, &path, &disks).map_err(to_filemeta_err)?;
 
                     let mut filter_prefix = {
                         prefix
@@ -4816,7 +4824,7 @@ async fn gather_results(
                 o: MetaCacheEntries(entries),
                 ..Default::default()
             }),
-            err: Some(Error::Unexpected.into()),
+            err: Some(rustfs_filemeta::Error::Unexpected),
         })
         .await
         .is_err()
@@ -5133,7 +5141,7 @@ impl Sets {
             .list_path(&opts)
             .await
             .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                err: Some(err.into()),
+                err: Some(to_filemeta_err(err)),
                 ..Default::default()
             });
         let next_cache_id = list_result.entries.as_ref().and_then(|entries| entries.list_id.clone());
@@ -5222,7 +5230,7 @@ impl Sets {
             .list_path(&opts)
             .await
             .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                err: Some(err.into()),
+                err: Some(to_filemeta_err(err)),
                 ..Default::default()
             });
         let next_cache_id = list_result.entries.as_ref().and_then(|entries| entries.list_id.clone());
@@ -5383,7 +5391,7 @@ impl Sets {
                 match res {
                     Ok(err) => {
                         log_list_path_worker_error("sets", "worker_error", &log_context, err.as_ref());
-                        MetaCacheEntriesSortedResult { entries: None, err: Some(err.as_ref().clone().into()) }
+                        MetaCacheEntriesSortedResult { entries: None, err: Some(to_filemeta_err(err.as_ref().clone())) }
                     },
                     Err(err) => {
                         log_list_path_worker_error("sets", "error_channel_closed", &log_context, &err);
@@ -5398,7 +5406,7 @@ impl Sets {
 
         if let Ok(err) = err_rx.try_recv() {
             log_list_path_worker_error("sets", "trailing_worker_error", &log_context, err.as_ref());
-            result.err = Some(err.as_ref().clone().into());
+            result.err = Some(to_filemeta_err(err.as_ref().clone()));
         }
 
         if result.err.is_some() {
@@ -5419,7 +5427,7 @@ impl Sets {
             }
 
             if !truncated {
-                result.err = Some(Error::Unexpected.into());
+                result.err = Some(rustfs_filemeta::Error::Unexpected);
             }
         }
 
@@ -5584,7 +5592,7 @@ impl Sets {
                 let reader_disks = disks.len();
 
                 let path = base_dir_from_prefix(prefix);
-                ensure_non_empty_listing_disks(bucket, &path, &disks)?;
+                ensure_non_empty_listing_disks(bucket, &path, &disks).map_err(to_filemeta_err)?;
 
                 let mut filter_prefix = prefix
                     .trim_start_matches(&path)
@@ -5911,7 +5919,7 @@ impl SetDisks {
             .list_path_result(&opts)
             .await
             .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                err: Some(err.into()),
+                err: Some(to_filemeta_err(err)),
                 ..Default::default()
             });
         let next_cache_id = list_result.entries.as_ref().and_then(|entries| entries.list_id.clone());
@@ -6040,7 +6048,7 @@ impl SetDisks {
             .list_path_result(&opts)
             .await
             .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                err: Some(err.into()),
+                err: Some(to_filemeta_err(err)),
                 ..Default::default()
             });
         let next_cache_id = list_result.entries.as_ref().and_then(|entries| entries.list_id.clone());
@@ -6128,7 +6136,7 @@ impl SetDisks {
             .list_path_result(&opts)
             .await
             .unwrap_or_else(|err| MetaCacheEntriesSortedResult {
-                err: Some(err.into()),
+                err: Some(to_filemeta_err(err)),
                 ..Default::default()
             });
         let next_cache_id = list_result.entries.as_ref().and_then(|entries| entries.list_id.clone());
@@ -6436,7 +6444,7 @@ impl SetDisks {
                 match res {
                     Ok(err) => {
                         log_list_path_worker_error("set_disks", "worker_error", &log_context, err.as_ref());
-                        MetaCacheEntriesSortedResult { entries: None, err: Some(err.as_ref().clone().into()) }
+                        MetaCacheEntriesSortedResult { entries: None, err: Some(to_filemeta_err(err.as_ref().clone())) }
                     },
                     Err(err) => {
                         log_list_path_worker_error("set_disks", "error_channel_closed", &log_context, &err);
@@ -6451,7 +6459,7 @@ impl SetDisks {
 
         if let Ok(err) = err_rx.try_recv() {
             log_list_path_worker_error("set_disks", "trailing_worker_error", &log_context, err.as_ref());
-            result.err = Some(err.as_ref().clone().into());
+            result.err = Some(to_filemeta_err(err.as_ref().clone()));
         }
 
         if result.err.is_some() {
@@ -6472,7 +6480,7 @@ impl SetDisks {
             }
 
             if !truncated {
-                result.err = Some(Error::Unexpected.into());
+                result.err = Some(rustfs_filemeta::Error::Unexpected);
             }
         }