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I've an external HDD of 500GB and in HFS+ format. It works normally on my Mac running OS X 10.5.8. After I plugged it into a machine running Windows, I found a vacant partition of 128MB and formatted it to NTFS. I used Paragon HFS+ for Windows to read and copy files.

Now I'm not able to write to that disk on my Mac. What is the problem?

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sounds like you got a Windows partition table. empty, reformat, copy back, don't do it again. – Thorbjørn Ravn Andersen May 24 '12 at 18:47
So what if i format the 128mb partition, will i get a Mac partition table? – Phung Trong Nam May 24 '12 at 18:59
Don't think so. Only way to be certain it works correctly is to reformat the drive. – Thorbjørn Ravn Andersen May 24 '12 at 22:59

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