Most other questions here close to this topic are either for SSDs, or ReadOnly usb live images.
I'd like opinions on Read-Write usb images. I pretty much installed Fedora18 on a 16GB USB3 pen drive (it's faster then a harddrive). i'm currently using ext4 and not giving any though about trim. The only thing i did was to mount all the frequently-written to directories (e.g. /tmp) to tmpfs.
my usage pattern will be to almost never write to the disk, only on system updates. (it's a home theater pc "HTPC" box)
I found publications suggesting JFFS2, YAFFS, UBIFS... but i know very little about them (my only other experience is with RO flash FS, which i use mostly for openWRT) and that paper makes considerations about the type of flash memory being used (i have no clue how to extract that information from my devices or from the manufacturer pages)
So, before I waste days research this topic, should i care about any of those? are them better than ext4 nowadays (that paper is from 2011)? Would i loose any functionality running those file systems as opposed to ext4 (e.g. permission control, suid control, etc)?