ext4 and linux swap partition!!

Could sonmeone, anyone please tell me what is the use/need of having a ext4 and linux swap partition in the SD card??


Android Expert
Ext4 partition is used together with data2ext scripts in phones with low internal memory. This effectively uses the space in SD card as a data partition, where applications are installed. It requires though a very fast SD card (minimum a class 4 card).

I've seen more commonly used ext3 partitions, which are used with app2SD+ scripts. These don't require fast cards and are still able to move more applications to SD card than the standard Google App2SD.
I found Gingerbread ASOP ROMs working very nicely with app2SD+ scripts.