Yes, please try this speed test of the internal HDD:
Be sure test file is removed before and after speed test:
rm -rf /var/media/android/test.speed
Write speed test:
echo 3 > /proc/sys/vm/drop_caches
dd if=/dev/zero of=/var/media/android/test.speed bs=1M count=1024
Read test:
echo 3 > /proc/sys/vm/drop_caches
dd if=/var/media/android/test.speed of=/dev/null bs=1M