Raw copy tool really OS independent?

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I have seen some tools that say are OS independent to make raw copy. But they are independent of which Windows version or independent of some of the major OS's, like those from Windows/linux/IOS.
Anyone could tell me which raw copy tool can handle HP-UX hard drives w/o any attempt to fix the source drive?
Which tool could you recommend to make sure the source drive is write protected?
Excuse me if I had said unknowingly something foolish, but I'm not expert in this field.