     
     override func deleteBlock(uid: UID) -> CUnsignedLongLong {
         
-        var pos = self.seekToFileID(uid)
-        
-        var header : StringStoreHeader = readHeader()
+        let pos = self.seekToFileID(uid)
+        
+        let header : StringStoreHeader = readHeader()
         
         if header.nextStringID > 0 {
             deleteBlock(header.nextStringID)

        header.used = true
        header.bufferLength = UInt8(stringData.length)
        
        var data : NSData = stringData.stringData.extendSize(BUFFER_LEN)
        
        writeHeader(header)
        write(data);

    
    override func initStore() {
        // write block 0
        //let text = "v1.0 String Store (c) S. Zehrer";
        //var stringData = SOStringData(string: text)
        
        //self.createBlock(stringData, withID:0)
    }
