you're not going to believe this.

[Wojciech Puchar]

>> whatever.
>
> Not so. See http://en.wikipedia.org/wiki/Flash_file_system
>
> Most flash devices sold as harddisks have hardware that emulates a
> traditional harddisk, representing it as a (P/S)ATA block device. Unless
> you can bypass this, there is no need for a special filesystem.

yes this is exactly a problem. it emulates hard disk, which lowers 
performance much. for example wear leveling and emulation small 
blocks requires moving of data within flash, this lowers both performance 
and lifetime.