External Hard Drive help

[Syslik]

I have a 80GB external hard drive ona USB. And when i connect it with my PC it works fine and i can put files on it and take files of it. However when i try to do it on my MacBP i can only take files of it and i can't put any files on it, and the reason it gives is because i don't have enough administrative rights... But about a month ago it worked absolutely fine....

Can anybody help please.

Thanks

 

[diadem]

Is your drive NTFS formated OSx cant write to NTFS formated drives it hsd to be fat32 for both to read and write to the drive. But Fat32 has a limit to file size anything 4Gb or more cant be put on to a Fat32 drive.