DD to FAT16 150MB Bernoulli disk

WRITE:
/mnt$ dd if=/dev/urandom of=blah bs=32k count=100 oflag=sync
3276800 bytes (3.3 MB, 3.1 MiB) copied, 12.2174 s, 268 kB/s
/mnt$ dd if=/dev/urandom of=blah bs=64k count=100 oflag=sync
6553600 bytes (6.6 MB, 6.2 MiB) copied, 16.2491 s, 403 kB/s
/mnt$ dd if=/dev/urandom of=blah bs=128k count=100 oflag=sync
13107200 bytes (13 MB, 12 MiB) copied, 24.7246 s, 530 kB/s
/mnt$ dd if=/dev/urandom of=blah bs=256k count=100 oflag=sync
26214400 bytes (26 MB, 25 MiB) copied, 40.9446 s, 640 kB/s
/mnt$ dd if=/dev/urandom of=blah bs=512k count=100 oflag=sync
52428800 bytes (52 MB, 50 MiB) copied, 79.2632 s, 661 kB/s
aperez@q6600:/mnt$

READ:
/mnt$ dd if=blah iflag=direct of=/dev/null bs=32k
52428800 bytes (52 MB, 50 MiB) copied, 97.2751 s, 539 kB/s
/mnt$ dd if=blah iflag=direct of=/dev/null bs=64k
52428800 bytes (52 MB, 50 MiB) copied, 77.2004 s, 679 kB/s
/mnt$ dd if=blah iflag=direct of=/dev/null bs=128k
52428800 bytes (52 MB, 50 MiB) copied, 66.7962 s, 785 kB/s
/mnt$ dd if=blah iflag=direct of=/dev/null bs=256k
52428800 bytes (52 MB, 50 MiB) copied, 61.8273 s, 848 kB/s