Thanks ABraun. I just tried to convert my first SLC to GRD and the error came up that “Cannot construct DataBuffer”. I don’t think I have RAM problem or Java problem! all my desktop computer and everything on it are brand new and I have lots of space! I read the same problem by others came up last year, but finally I didn’t get what to do and seems the conversation is not ended with a real solution. Any idea you might have?