let me google that for you :)
http://lmgtfy.com/?q=How+can+I+prevent+my+Pi%27s+SD+card+from+getting+corrupted+so+often%3F
röviden:
http://raspberrypi.stackexchange.com/questions/7978/how-can-i-prevent-my-pis-sd-card-from-getting-corrupted-so-often
Edit /etc/fstab. It should look something like the following:
proc /proc proc defaults 0 0
/dev/mmcblk0p1 /boot vfat ro 0 0
/dev/mmcblk0p2 / ext4 ro 0 0
/dev/mmcblk0p3 /home ext4 defaults,errors=remount-ro 0 1
none /var/run ramfs size=1M 0 0
none /var/log ramfs size=1M 0 0
lényeg, ramdisk logokra és ro majdnem mindenova kivéve ahova a hőmérsékletet írod.