ZuluIDE V2 rigid HDD read performance in UDMA/33 mode

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=512
12012544 bytes (12 MB, 11 MiB) copied, 6.2631 s, 1.9 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=1024
18690048 bytes (19 MB, 18 MiB) copied, 5.29046 s, 3.5 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=2k
34897920 bytes (35 MB, 33 MiB) copied, 5.92448 s, 5.9 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=4k
57552896 bytes (58 MB, 55 MiB) copied, 6.10589 s, 9.4 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=8k
115818496 bytes (116 MB, 110 MiB) copied, 8.05433 s, 14.4 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=16k
103251968 bytes (103 MB, 98 MiB) copied, 6.39064 s, 16.2 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=32k
109903872 bytes (110 MB, 105 MiB) copied, 5.39037 s, 20.4 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=64k
129499136 bytes (129 MB, 124 MiB) copied, 5.5821 s, 23.2 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=128k
166068224 bytes (166 MB, 158 MiB) copied, 6.6544 s, 25.0 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=256k
130023424 bytes (130 MB, 124 MiB) copied, 5.20777 s, 25.0 MB/s

aperez@oregon:/mnt$ dd iflag=direct if=testfile of=/dev/null status=progress bs=512k
125829120 bytes (126 MB, 120 MiB) copied, 5 s, 25.1 MB/s