diff --git a/include/aaruformat/context.h b/include/aaruformat/context.h
index 1aea459..1856df3 100644
--- a/include/aaruformat/context.h
+++ b/include/aaruformat/context.h
@@ -209,6 +209,9 @@ typedef struct aaruformatContext
     UT_array   *indexEntries;   ///< Flattened index entries (UT_array of IndexEntry).
     hash_map_t *sectorHashMap;  ///< Deduplication hash map (fingerprint->entry mapping).
     bool        deduplicate;    ///< Storage deduplication active (duplicates coalesce).
+
+    bool     rewinded;            ///< True if stream has been rewound after open (write path).
+    uint64_t last_written_block;  ///< Last written block number (write path).
 } aaruformatContext;
 
 /** \struct DumpHardwareEntriesWithData
diff --git a/src/create.c b/src/create.c
index f70a0c8..63d18eb 100644
--- a/src/create.c
+++ b/src/create.c
@@ -307,6 +307,9 @@ void *aaruf_create(const char *filepath, const uint32_t media_type, const uint32
     if(ctx->deduplicate)
         ctx->sectorHashMap = create_map(ctx->userDataDdtHeader.blocks * 25 / 100);  // 25% of total sectors
 
+    ctx->rewinded           = false;
+    ctx->last_written_block = 0;
+
     // Is writing
     ctx->isWriting = true;
 
diff --git a/src/write.c b/src/write.c
index dd7a6ce..b87b37e 100644
--- a/src/write.c
+++ b/src/write.c
@@ -146,6 +146,16 @@ int32_t aaruf_write_sector(void *context, uint64_t sector_address, bool negative
     }
 
     // TODO: Check rewinded for disabling checksums
+    if(!ctx->rewinded)
+    {
+        if(sector_address <= ctx->last_written_block)
+        {
+            TRACE("Rewinded");
+            ctx->rewinded = true;
+        }
+        else
+            ctx->last_written_block = sector_address;
+    }
 
     // TODO: If optical disc check track