diff --git a/components/fatfs/fatfs_utils/utils.py b/components/fatfs/fatfs_utils/utils.py
index e869a64064..e7d2e25a7f 100644
--- a/components/fatfs/fatfs_utils/utils.py
+++ b/components/fatfs/fatfs_utils/utils.py
@@ -42,7 +42,10 @@ FATFS_SECONDS_GRANULARITY: int = 2
 LONG_NAMES_ENCODING: str = 'utf-16'
 SHORT_NAMES_ENCODING: str = 'utf-8'
 
-ALLOWED_SECTOR_SIZES: List[int] = [4096]
+# compatible with WL_SECTOR_SIZE
+# choices are WL_SECTOR_SIZE_512 and WL_SECTOR_SIZE_4096
+ALLOWED_SECTOR_SIZES: List[int] = [512, 4096]
+
 ALLOWED_SECTORS_PER_CLUSTER: List[int] = [1, 2, 4, 8, 16, 32, 64, 128]
 
 
@@ -280,4 +283,5 @@ class FATDefaults:
     TEMP_BUFFER_SIZE: int = 32
     UPDATE_RATE: int = 16
     WR_SIZE: int = 16
+    # wear leveling metadata (config sector) contains always sector size 4096
     WL_SECTOR_SIZE: int = 4096
diff --git a/components/fatfs/fatfsgen.py b/components/fatfs/fatfsgen.py
index 8976b1567b..d70fb7ec60 100755
--- a/components/fatfs/fatfsgen.py
+++ b/components/fatfs/fatfsgen.py
@@ -161,6 +161,8 @@ class FATFS:
 
 def main() -> None:
     args = get_args_for_partition_generator('Create a FAT filesystem and populate it with directory content')
+    if args.sector_size != 0x1000:
+        raise NotImplementedError('The sector size not equal to 4096 is currently not supported for read-only mode!')
     fatfs = FATFS(sector_size=args.sector_size,
                   sectors_per_cluster=args.sectors_per_cluster,
                   size=args.partition_size,
diff --git a/components/fatfs/wl_fatfsgen.py b/components/fatfs/wl_fatfsgen.py
index 827dfe72a1..b6c5dd4fe7 100755
--- a/components/fatfs/wl_fatfsgen.py
+++ b/components/fatfs/wl_fatfsgen.py
@@ -82,6 +82,7 @@ class WLFATFS:
 
     def __init__(self,
                  size: int = FATDefaults.SIZE,
+                 sector_size: int = FATDefaults.SECTOR_SIZE,
                  reserved_sectors_cnt: int = FATDefaults.RESERVED_SECTORS_COUNT,
                  fat_tables_cnt: int = FATDefaults.FAT_TABLES_COUNT,
                  sectors_per_cluster: int = FATDefaults.SECTORS_PER_CLUSTER,
@@ -122,7 +123,7 @@ class WLFATFS:
             reserved_sectors_cnt=reserved_sectors_cnt,
             fat_tables_cnt=fat_tables_cnt,
             sectors_per_cluster=sectors_per_cluster,
-            sector_size=FATDefaults.WL_SECTOR_SIZE,
+            sector_size=sector_size,
             root_entry_count=root_entry_count,
             hidden_sectors=hidden_sectors,
             long_names_enabled=long_names_enabled,
@@ -221,6 +222,7 @@ if __name__ == '__main__':
 
     wl_fatfs = WLFATFS(sectors_per_cluster=args.sectors_per_cluster,
                        size=args.partition_size,
+                       sector_size=args.sector_size,
                        root_entry_count=args.root_entry_count,
                        explicit_fat_type=args.fat_type,
                        long_names_enabled=args.long_name_support,