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It seems to me that when the drive was partitioned, the whole thing was not partitioned. If using Windows XP you can go under the Control Panel, Administrative Tools, Computer Management and then Disk Management. You should be able to see the drive and if any unpartitioned space is available.
Is it showing the 300gig in the properties? if yes then try to copy with command mode,If again its given problem then u need to backup your data and format the drive, then try copying.I think it will work.
external USB hard drives do not need to be jumpered, if your computer does not recognize the ext. drive probably it is because the enclosure is defective, when you connect the USB cable you should get the "ding-dong" connection sound.
If you think that your computer recognizes the hard drive then jumper it as "secondary" or "cable select" and install it INTERNALLY, then transfer your data, that will prove that there's a problem with the ext. enclosure.
One more thing, maybe the USB port you use is malfunctioning, try one that you know that works (assuming that you have other USB devices that work).
just go to All programs<Accessories<System Tools<Backup. and choose the option you want.Once you have choosen what all you want to backup than you can choose the option for the place where you want to back it up.
Hope that works!