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.

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