They use RFS - Robust FAT File System (sorta sounds like an oxymoron) got this off Samsung Global:
In today's mobile industry, it is expected that more mobile phone manufacturers will adopt embedded Linux in their mobile phone's operating system due to its low cost and the widest hardware support.
SAMSUNG RFS (Robust FAT File System) is an embedded file system to use OneNAND flash memory as the storage on your Linux based product. SAMSUNG RFS is a highly optimized software solution to manage file on OneNAND flash memory. It runs on Linux and is fully compatible with FAT16/32 file system standards. For 'robustness', SAMSUNG RFS provides a journaling error recovery mechanism, which keep the file system up and running even after many times of sudden power failures.
SAMSUNG RFS supports only OneNAND flash memory. It fully utilizes the advanced flash technology of OneNAND, together with the state-of-the-art file system design techniques. SAMSUNG RFS delivers superior read/write performance compared to the existing solutions.
SAMSUNG RFS has been fully tested and debugged on Linux Kernel 2.4/2.6 with TI OMAP 2420(ARM 11 core). A kernel configuration option is provided that enables you to distribute RFS as a loadable kernel module without leaving the Linux native kernel build environment.
ext 4 is superior. in every way. the voodoo kernel lets you convert the phone to ext4, just not sure about the sd card.
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