When a new Android device comes out, we spend a lot of time obsessing over which ARM chip it runs and how much RAM there is, but the storage speed often has a significant impact on performance too. Although, mobile flash storage controllers haven't been been improving at the same rate as other hardware. SanDisk hopes to fix that with the iNAND Extreme embedded storage platform, which offers three times the random write speed and twice the sequential read speed of current solutions.
Many users of the original Nexus 7 remember how slow the device could get after a few months of heavy use. At least part of this problem has to do with the way NAND flash stores and deletes data. Android 4.3 comes with a little-hyped feature that could be huge for performance in the future – TRIM support via fstrim.
There were ways to run the fstrim command on devices before, but it required root.
Most of the file systems in use today were designed in an era when rotating discs ruled the world. Well, as things have shifted more toward NAND flash-based storage in mobile devices the problems with older file systems have been more visible. Samsung has just tackled the problem by designing a new file system called F2FS that's geared toward flash storage specifically. What's better, it is open source and has been submitted to the Linux kernel.