J2ME RMS zczytywanie i zapamietywanie

czy ponizsze funkcje 1-sza zapisze string do pamici telefonu, 2-ga go zczyta?
pytam bo czasami mi zczytuje inna liczbe niz powinien..

/*
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package tools;

import javax.microedition.rms.*;
/**
 *
 * @author bart
 */
public class rms {
    
    public static void rmsSave (String _key) {
        try {
            RecordStore rs = RecordStore.openRecordStore("MyKeys", true);
            
            String appt = _key;
            byte bytes[] = appt.getBytes();
            rs.addRecord(bytes,0,bytes.length);
            rs.closeRecordStore();
        } catch (RecordStoreException ex) {
            ex.printStackTrace();
        }
        
    }
    
    public static String rmsRestore () {
        String key = new String();
        
        try {
            RecordStore rs = RecordStore.openRecordStore("MyKeys", true);

            if (rs.getNumRecords() > 0) {
                byte b[] = rs.getRecord(1);
                key = new String(b,0,b.length);
                
                rs.closeRecordStore();
            }
        } catch (RecordStoreException ex) {
            ex.printStackTrace();
        }
        
        return key;
    }
}