Micro SD are notoriously bad for server usage, they are designed to store infrequently changed files for a while, like mp3 collection, cameraphone snapshots, apps etc... Going with a brand name might help.
In order to extend their lifespan, you might want to minimize the writes by disabling some logs and the "last access" updates on files (`noatime` for "no access times").
Instead of disabling the logs, you can put them on a tmpfs. You'll lose them if the machine crashes or reboots, but it's still better than not having them at all.
In order to extend their lifespan, you might want to minimize the writes by disabling some logs and the "last access" updates on files (`noatime` for "no access times").
Some examples: http://tombuntu.com/index.php/2008/09/04/four-tweaks-for-usi...