break large TDMS file into small files

hello all

My TDMS file is around 3g, and needs changed into around 10M size files. 

I ran McRorie's splitFiles.vi ‏15 KB in this page.  and set the number of samples per file as 5000000, however, I cannot get the results I need. every small file is only 1KB, and no data inside. What is the possible problem in this?

Also, I tried to write a vi based on sample vi(Read TDMS File) by adding one "write to measurement file.vi". However, when I set the small file size as 10M Byte inside the"write to measurement file.vi", the first file could be around 20M, and the next few files may be correct as 10M, and then it just stop splitting, edding with a file even much larger than original file. I uploaded my vi here, maybe someone  can help to find some mistake for me. 

Thanks very much!

Wuwei Mao