SD Card Throughput exceeds - On using "dd" command

[amio]

Hi All,
Am using dd command to find throughput of my SD card.
After mounting the sd card, i run,

time dd if=/dev/zero of=/mnt/sdcard/Myfile.txt bs=512
count=20480;umount /mnt/sdcard;
20480+0 records in
20480+0 records out
10485760 bytes (10 MB) copied, 0.0658825 s, 159 MB/s

real    0m0.097s
user    0m0.013s
sys     0m0.055s

But the throughput shown exceeds the throughput of SD specification.
Can anyone comment on this??

Thanks,
Amio

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