SD card speed?

[Krassimir Slavchev]

Hello,

I have made some test:

dd if=/dev/zero of=file.dat bs=1m count=10
SD card on arm           - 10485760 bytes transferred in 41.431916 secs 
(253084 bytes/sec)
NFS mount from arm - 10485760 bytes transferred in 6.181458 secs 
(1696325 bytes/sec)
SD card on i386 PC    - 10485760 bytes transferred in 6.765610 secs 
(1549862 bytes/sec)

The SD card is very slow on arm may be because it uses 1 bit bus.

Is there any problems with 4 bit bus support or my card is incorrectly 
detected?

Best Regards