diff --git a/src/ddt/ddt_v2.c b/src/ddt/ddt_v2.c
index aed55dd..f6cc3d6 100644
--- a/src/ddt/ddt_v2.c
+++ b/src/ddt/ddt_v2.c
@@ -1039,6 +1039,11 @@ void set_ddt_multi_level_v2(aaruformatContext *ctx, uint64_t sectorAddress, bool
             return;
         }
 
+        // Update nextBlockPosition to ensure future blocks don't overwrite the DDT
+        uint64_t ddtTotalSize  = sizeof(DdtHeader2) + ddtHeader.length;
+        ctx->nextBlockPosition = (endOfFile + ddtTotalSize + alignmentMask) & ~alignmentMask;
+        TRACE("Updated nextBlockPosition after DDT write to %" PRIu64, ctx->nextBlockPosition);
+
         fseek(ctx->imageStream, savedPos, SEEK_SET);
 
         // Free the cached table
diff --git a/src/write.c b/src/write.c
index a286228..42da07f 100644
--- a/src/write.c
+++ b/src/write.c
@@ -112,14 +112,6 @@ int32_t aaruf_write_sector(void *context, uint64_t sectorAddress, uint8_t *data,
 
         TRACE("Initializing CRC64 context");
         ctx->crc64Context = aaruf_crc64_init();
-
-        // Get current file position
-        long pos = ftell(ctx->imageStream);
-        TRACE("Saving current file position as next block position: %ld", pos);
-
-        // Calculate and save next block aligned position
-        ctx->nextBlockPosition =
-            pos / (1 << ctx->userDataDdtHeader.blockAlignmentShift) * (1 << ctx->userDataDdtHeader.blockAlignmentShift);
     }
 
     TRACE("Copying data to writing buffer at position %zu", ctx->writingBufferPosition);
@@ -176,6 +168,12 @@ int32_t aaruf_close_current_block(aaruformatContext *ctx)
     if(fwrite(ctx->writingBuffer, ctx->currentBlockHeader.length, 1, ctx->imageStream) != 1)
         return AARUF_ERROR_CANNOT_WRITE_BLOCK_DATA;
 
+    // Update nextBlockPosition to point to the next available aligned position
+    uint64_t blockTotalSize = sizeof(BlockHeader) + ctx->currentBlockHeader.cmpLength;
+    uint64_t alignmentMask  = (1ULL << ctx->userDataDdtHeader.blockAlignmentShift) - 1;
+    ctx->nextBlockPosition  = (ctx->nextBlockPosition + blockTotalSize + alignmentMask) & ~alignmentMask;
+    TRACE("Updated nextBlockPosition to %" PRIu64, ctx->nextBlockPosition);
+
     // Clear values
     free(ctx->writingBuffer);
     ctx->writingBuffer      = NULL;