diff --git a/crates/ecstore/src/lib.rs b/crates/ecstore/src/lib.rs
index 7f494b36e..269d125d7 100644
--- a/crates/ecstore/src/lib.rs
+++ b/crates/ecstore/src/lib.rs
@@ -48,6 +48,7 @@ mod set_disk;
 mod sets;
 mod storage_api_contracts;
 mod store;
+#[path = "store/init_format.rs"]
 mod store_init;
 #[path = "store/list_objects.rs"]
 mod store_list_objects;
diff --git a/crates/ecstore/src/store_init.rs b/crates/ecstore/src/store/init_format.rs
similarity index 100%
rename from crates/ecstore/src/store_init.rs
rename to crates/ecstore/src/store/init_format.rs
diff --git a/docs/architecture/migration-progress.md b/docs/architecture/migration-progress.md
index 11affb5bd..870684b7e 100644
--- a/docs/architecture/migration-progress.md
+++ b/docs/architecture/migration-progress.md
@@ -5,21 +5,20 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 ## Current Context
 
 - Issue: [`rustfs/backlog#660`](https://github.com/rustfs/backlog/issues/660)
-- Branch: `overtrue/arch-ecstore-store-support-layout`
+- Branch: `overtrue/arch-ecstore-store-init-layout`
 - Baseline: completed `C-011/C-012/C-013/API-055/API-059/API-079/API-080/API-081/API-082/API-083/API-084/API-085/API-086/API-087/API-088/API-089/API-090/API-091/API-092/API-093/API-094/API-095/API-096/API-097/API-098/API-099/API-100/API-101/API-102/API-103/API-104/API-105/API-106/API-107/API-108/API-109/API-110/API-111/API-112/API-113/API-114/API-115/API-116/API-117/API-118/API-119/API-120/API-121/API-122/API-123/API-124/API-125/API-126/API-127/API-128/API-129/API-130/API-131/API-132/API-133/API-134/API-135/API-136/API-137/API-138/API-139/API-140/API-141/API-142/API-143/API-144/API-145/API-146/API-147/API-148/API-149/API-150/API-151/API-152/API-153/API-154/API-155/API-156/API-157/API-158/API-159/API-160/API-161/API-162/API-163/API-164/API-165/API-166/API-167/API-168/API-169/API-170/API-171/API-172/API-173/API-174/API-175/API-176/API-177/API-178/API-179/API-180/API-181/API-182/API-183/API-184/API-185/API-186/API-187/API-188/API-189/API-190/API-191/API-192/API-193/API-194/API-195/API-196/API-197/API-198/API-199/API-200/API-201/API-202/API-203/API-204/API-205/API-206/API-207/API-208/API-209/API-210/API-211/API-212/API-213/API-214/API-215/API-216/API-217/API-218/API-219/API-220/API-221/API-222/API-223/API-224/API-225/API-226/API-227/API-228/API-229/API-230/API-231/API-232/API-233/API-234/API-235/API-236/API-237/API-238/API-239/API-240/API-241/API-242/API-243/API-244/API-245/API-246/API-247/API-248/API-249/API-250/API-251/API-252/API-253/API-254/CTX-002`.
 - Current baseline also includes API-255 from PR #3923, API-256 from PR
   #3925, and CFG-009 from PR #3927.
-- Current phase PR: E-018/E-STORE-002 ECStore store support module owner layout.
-- Based on: E-017 branch while PR #3929 is pending; rebase onto `origin/main`
-  after E-017 merges before opening this PR.
+- Current phase PR: E-019/E-STORE-003 ECStore store init support module owner layout.
+- Based on: E-018 branch while PR #3929 is pending; rebase onto `origin/main`
+  after E-017 and E-018 merge before opening this PR.
 - PR type for this branch: `pure-move`
-- Runtime behavior changes: none expected for E-018; this is a pure module file
-  move that keeps the existing `store_list_objects` and `store_utils` module
-  paths.
-- Rust code changes: move ECStore store support modules into the `store/`
+- Runtime behavior changes: none expected for E-019; this is a pure module file
+  move that keeps the existing `store_init` module path.
+- Rust code changes: move ECStore store init support module into the `store/`
   owner directory without function-body changes.
 - CI/script changes: reject restoring ECStore root `store.rs`, `set_disk.rs`,
-  `store_list_objects.rs`, or `store_utils.rs`;
+  `store_list_objects.rs`, `store_utils.rs`, or `store_init.rs`;
   lock completed config model ownership against restoring
   old `rustfs_ecstore::config` model/accessor compatibility paths, and lock
   ECStore public facades against re-exporting the moved server-config symbols;
@@ -54,8 +53,9 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
   `rustfs_ecstore::api` facade imports outside local `storage_api` boundary
   files after API-256, and reject restoring old ECStore server-config model or
   global accessor compatibility paths after CFG-009, reject restoring ECStore
-  root `store.rs` or `set_disk.rs` after E-017, and reject restoring ECStore
-  root store support modules after E-018.
+  root `store.rs` or `set_disk.rs` after E-017, reject restoring ECStore root
+  store support modules after E-018, and reject restoring ECStore root
+  `store_init.rs` after E-019.
 
 ## Phase 0 Tasks
 
@@ -3919,6 +3919,19 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
     formatting, diff hygiene, Rust risk scan, branch freshness check,
     pre-commit quality gate, and three-expert review.
 
+- [x] `E-019/E-STORE-003` Move ECStore store init support module under the store owner.
+  - Do: move `crates/ecstore/src/store_init.rs` to
+    `crates/ecstore/src/store/init_format.rs` while preserving the existing
+    crate module name through a path declaration.
+  - Acceptance: `crate::store_init` continues to resolve through the same
+    module name, and migration rules reject restoring the old root file.
+  - Must preserve: disk initialization, format quorum loading, MinIO format
+    migration, format write/read helpers, store initialization call sites,
+    set-disk format helpers, and all runtime side effects.
+  - Verification: focused ECStore compile/tests, migration and layer guards,
+    formatting, diff hygiene, Rust risk scan, branch freshness check,
+    pre-commit quality gate, and three-expert review.
+
 - [x] `API-129` Route RustFS internal ECStore consumers through owner boundary.
   - Do: expose crate-local ECStore facade module aliases from
     `rustfs/src/storage/mod.rs` and migrate RustFS startup, server, capacity,
@@ -5773,6 +5786,9 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 
 | Expert | Status | Notes |
 |---|---|---|
+| Quality/architecture | pass | E-019 moves ECStore store init format support under the store owner directory and extends the existing root support guard. |
+| Migration preservation | pass | `crate::store_init` stays stable through a path declaration, and the moved file is a 100% rename with no function-body changes. |
+| Testing/verification | pass | ECStore tests, architecture/layer guards, formatting, diff hygiene, diff-added Rust risk scan, and pre-commit passed. |
 | Quality/architecture | pass | E-018 moves ECStore store list/object utility support modules under the store owner directory and guards against restoring the old root files. |
 | Migration preservation | pass | `crate::store_list_objects` and `crate::store_utils` module names stay stable through path declarations, while both moved files are 100% renames. |
 | Testing/verification | pass | ECStore compile/tests, architecture/layer guards, formatting, diff hygiene, diff-added Rust risk scan, and pre-commit passed. |
diff --git a/scripts/check_architecture_migration_rules.sh b/scripts/check_architecture_migration_rules.sh
index 23f6f0e72..a008b5ac8 100755
--- a/scripts/check_architecture_migration_rules.sh
+++ b/scripts/check_architecture_migration_rules.sh
@@ -2796,6 +2796,7 @@ fi
   {
     [[ -e crates/ecstore/src/store_list_objects.rs ]] && printf '%s\n' 'crates/ecstore/src/store_list_objects.rs'
     [[ -e crates/ecstore/src/store_utils.rs ]] && printf '%s\n' 'crates/ecstore/src/store_utils.rs'
+    [[ -e crates/ecstore/src/store_init.rs ]] && printf '%s\n' 'crates/ecstore/src/store_init.rs'
     true
   }
 ) >"$ECSTORE_ROOT_STORE_SUPPORT_MODULE_HITS_FILE"