May i know if a normal commerical MicroSD card/all-in-one card reader be able to read and write data? I am filtering out options of using a solely miniUSB cable to upload/download files on my Nokia 6300, thus i would like to know whether the available technology be able to perform the same functions required?

I do alot of tranfering files to and from micro sd cards with my three phones, and ds cards. A normal commercial microsd card reader will read any files your nokia is putting on it. The only thing you have to watch out for is microsd HC. Two of my devices support High Content cards, the others do not. The HC devices will read all cards. You need a reader that will support HC cards also.

In other words, yes a standard commercial reader will do all read write functions to the card just as it would if you plug your phone into the computer via USB.