This question isn't really related to what you are thinking with regard to blockwrite vs. write. It depends on the size of the file and what you are doing with it. If the full extent of TDNCFile is the 110 bytes, then it really isn't going to matter. But if TDNCFile is much larger than a few records, then using blockread/blockwrite with many more records involved will be of benefit. You always want to reduce I/O, if possible.
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