[Discuss-gnuradio] GRC problems, saving data to files

[Baier]

Dear all,

I generated random data with random source block and saved it to rhe 
file data_1k(File sink). After that I modulated the random data (ofdmmod 
block, fft size 256, occupied tones 100, cyclic prefix 128) and then 
demodulated them (ofdmdem block). Then I saved data to the file 
data_dem_1k (File sink block). But the first file data_1k has 4 kB, and 
the second file data_dem_1k 3,1 kB. I compared the files with the hex 
editor and realised the files are the same. Only the second files 
doesn't have the  last 10 percent of data at the end of file.
Is it a bug or I'm doing something wrong?
Thank you very much for the answers!