I have two WDC (Western Digital) portable hard disks. My first portable HD has 160 GB and the other one has 500 GB. My 500 GB hard disk is now running low on free spaces, so i'm planning to buy another one, but i'm going to look for 1 TB instead of 640 GB. Unfortunately, there's no 1 TB for passport essential series. 1 TB is only available on passport essential SE or elements portable SE, which is not so portable as it's bigger than essential version. It's still too expensive for me, as it will cost around USD 199.99.
Let's just hope the cost will decrease soon and i am not running out of space before that happened