Cant write/edit data on my external hard disk! Help please!~~

Okay guys, currently, i'm using Tiger version 10.4.11. My problem is that i cant edit data or write data to any external hard disks, like the maxtor One Touch and so on. Only thing i can do is to extract the data from the disks. I have tried to write on multiple hard disks but in all my attempts i have failed. i've tried to edit my network settings, but no results.
So, i seek help from anyone out here!

Hello, yea.. thanks man =)
Basically, its a shared hard disk between my macbook and a windows PC. So i kinda use the PC to write all my backups and data on the hard disk.
I have quite a few hard disk and they all have the same issue. It says 'The item 'file x'cannot be moved because 'my hard disk' cannot be modified.'I've used the software provided from the hard disk manufacturer, Maxtor/Seagate, to reformat the brand new portable hard disk which i bought yesterday.
Its connected via USB, same as all the other ones i have.
eh. the get info for it says
Kind: Volume
Created: --
Modified: Thursday, 23 Aprl 2009 3:24AM
Format: Windows NT Filesystem
Capacity: 232.88 GB
Available: 232.57 GB
Ownerships & Permissions: You can only read.
erm... its a portable drive which i carry around, so i guess its not a network drive? and how doi determine the network settings? Sorry man.. not really good at these =x

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