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Now I took the harddrive into a powelful pc and using a nano RTLSDR Stick, but the effect is the same (using now the unmodified tool):

$> ./rtlsdr_scan.py -s 96 -e 97 -d 3 test2.csv
RTLSDR Scanner

Found Elonics E4000 tuner
96 - 97MHz
-1.0dB Gain
4.194s Dwell
1024 FFT points
0MHz LO
Generic RTL2832U
Starting
Found Elonics E4000 tuner
Exact sample rate is: 2000000.052982 Hz
Speicherzugriffsfehler (Speicherabzug geschrieben) = segmentation fault (core dumped)

So I think it is not an issue of performance.
M°Jesús