is this normal or brand new sd card is faulty somehow?
dd if=/dev/zero of=~/test.tmp bs=500K count=1024 501+0 records in 501+0 records out 256512000 bytes (257 MB) copied, 78.3388 s, 3.3 MB/s
root@raspberrypi:/home/pi# hdparm -tT /dev/mmcblk0 /dev/mmcblk0: Timing cached reads: 304 MB in 2.01 seconds = 151.46 MB/sec Timing buffered disk reads: 50 MB in 3.09 seconds = 16.18 MB/sec
SD Card: Kingston 8GB Class4
kernel: Linux raspberrypi 3.2.27+ #250 PREEMPT Thu Oct 18 19:03:02 BST 2012 armv6l GNU/Linux
Should I change for some another SD card? I saw some tests and with class4 I should have better write speeds.