Why cant i copy file from my macbook to my portable harddrive?

i just bought a new macbook. i'm kinda newbie. i tried copying file from my macbook to portable harddive. it didnt work. can anyone tell me why? by the way, my harddrive is NTFS system. the funny thing is that i can copy file from my harddrive to my macbook.
thanks for the kind soul out there.
mac book Mac OS X (10.4.9)

The easiest way around this is to reformat the external drive to be FAT32 if you want to use it with other PCs, or HFS+ if you only want to use it with Macs. You will lose all the data off the drive when you do this.
You can reformat the drive using Disk Utility.

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