Can't write to pc disk

I tried to write to a friend's hard disk but the disk is indicated as read only. There is no problem reading from it. I cannot "ignore permission because there is no checkbox on my dialog box. Does this disk have to be changed from the original computer to allow me to write to it, or can I do something in my system to allow me to write to it?

"In his session at Macworld on OS X filesytems, Google's Amit Singh announced that he has ported Linux's FUSE module to OS X. The port is called MacFUSE and it is available in source form and as a pre-compiled kernel extension with associated tools. Many FUSE filesystems such as sshfs and ntfs-3g are reported to work."
This should allow you to write filess to the NTFS formated external disks as well.
Downloads and additional info at http://code.google.com/p/macfuse/

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       Whole:                    Yes
       Internal:                 No
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