Q: Is it the memory space that matters always in it?? or is there any other good feature of that? is that brand specific?
A: Basically how much memory the pen drive holds is always important. i used to have a 512 mb one but it filled up with my junk to quickly so i upgreded to an 8gb now i never come close to filling it up. If you are going to be using the pen drive alot, if not get a 1gb one i have one for school work and it comes in handy for projecs and documents. The more you rely on floppy discs, etc the bigger it should be. Basically you want a pen drive that is compatible with your computer and offers good warranty and support, my faveourite brand is transcend that is just my opinion. Toshiba also have a range of pendrives that are very reliable and in australia are selling for as little as $5 for the 512mb, If you have a toshiba computer i would recommened the toshiba to avoid softwear problems. Otherwise i myself from use recommend transcend as they look good as well as work good. Good Luck!!! Hope this helps