Hi I just got my new Transcend StoreJet 640 GB external hdd, and I have some small questions about this: 1. The drive came with two cables, one USB and one power-cable to connect to a second USB. The manual says I should use BOTH cables. Is this necessary? 2. The drive is formated as FAT32, but I have a lot of big files (4.5 GB and more), and I would like to format it as NTFS. Are there any reasons NOT to do this? And do I need to format the entire disk, or is it possible to change from FAT32 to NTFS without formating and losing files. Thank you for your help.