Cannot write to an External Hdd

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hello..i'm having bit of a problem using an external hard drive...i can read and copy off of it...but i can't write to it...a message pops up basically stating it cannot be modified...help plzz...
 
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Aug 18, 2007
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Location
Wilmington, NY
Your Mac's Specs
15" Unibody MBP (2009), White MB (2009), iMac G4
How is the hard drive formatted? If it is formatted as NTFS you will not be able to write to the drive. It might be formatted this way if it was used in the past with a Windows system. You will need to back up any data on the drive and reformat in a way that Mac OS X can read and write to. Generally, if you are only going to use this with a Mac, this would be Mac OS Extended (Journaled). If you need to use it with both a Mac and a Windows computer, you can format as MS-DOS (FAT32) and have read and write capabilities on both systems.

To format the drive go to /Applications/Utilities/Disk Utility
 
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Your Mac's Specs
15" MBP 2.4GHz 4GB, iPod Classic 120GB
ADK you beat me to it. :p
 
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