[quote=andy53]due with CF (SSD) block mode, please try to test starting in 64kb... , too low will merge up the block writing.. [attachment=0:14w1nbg8]300x1024.jpg[/attachment:14w1nbg8][/quote] OK, thanks. This report shows not so good write performance with 64 KB samples: 10 MB/s (also the original SSD was 10 MB/s) your previous report was 30 MB/s (the same with 128 KB samples) With 256-1024 samples: 17 MB/s CF, 10 MB/s SSD. What's happened? Luigi