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As the title says, can dd copy down from hard disks even when operating system cannot recognize file system of partitions of hard disks?

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  • When you access the raw device, you're bypassing the filesystem driver and reading the data directly from the disk.
    – Barmar
    Nov 12, 2014 at 19:16

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Yes, it can.

Think of dd as a Xerox style copier which can copy pages despite not understanding the text written on it.

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Yes, that's the reason dd is often used to create an exact copy of a faulty drive for further rescue attempts that won't cause further damage (and to have a backup copy).

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