Hi everyone, i am thinking about getting some external HDD for backups and data transfer. In the past im always using DVD disc but i think it's very inconvenient and sort of wasting time (burnin time). So i've seen few models on the market but what is i'm about to ask is: which size of external HDD is good? 2.5" or 3.5" (i'm not going for 1.8") and which type of the HDD has better quality? IDE or SATA? Well, im really thinking about 2.5" as it can be used without wall power am i right? So 3.5" will be bulky and less convenient as it has fan, power supply cable and of course bigger case. (though it has hi-er RPM) But for the SATA and IDE, i really have no idea as i do not know much what is the MAIN difference. I hope other users could share their info Thanks.