Loss of data in writing large String to a file

Hello,
I have approximately an 8Mbyte string I want to write to the hard drive. In doing so approximately the last 100 characters is not getting written. I am debugging in NetBeans and on the final write, I can check the variable, and it does contain all of the data. I then view the file with notepadd++ and the last (approximate) 100 characters are missing. I also have read the data back in to confirm that notepadd++ is displaying the same thing.

 java.io.File testFile;
 testFile = new java.io.File(FilePathName);       
 java.io.FileWriter FW = new java.io.FileWriter(testFile);
 java.io.BufferedWriter BR = new java.io.BufferedWriter(FW);
 String temp = getFaxFileData();     //at break point all data is in this string
 char[] fullfile = temp.toCharArray(); // all data is in this character array
 BR.write(fullfile, 0, fullfile.length);     //break point inserted here

I have also tried writing just the string, and not using a buffered writer:

 
FW.write(temp);//tried this
BR.write(temp); //and this

and the same truncation occurs. I have no bizarre character values, they are all a-z 1-0 and !@#$%^&*())_+=-. Any help is appreciated as this is a strange issue. As I said before I have also read the data back in to make sure it wasn't some strange OS thing with how I was viewing the data, and the data read back in was consistent with what was viewed in the file. Thank you in advance.