✔ 最佳答案
Sounds like you have formated your portable HDD in NTFS permission and your default permission is everyone able to read and only your own user account from your PC can write to it.
So when you take your portable HHD to another computer, it can only read as everyone is allowed to read from it. But only user account from your PC can write to it. I'm assuming that you are using WinXP Pro.
You can backup all data from on the portal HDD and format it again choose use FAT32 partition type. This way there is no permission information at all.
Give it a try.