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I am moving data from an almost dead HDD to an external USB drive using linux , because for some reason Windows cannot see the data. I want to copy a large amount of data over from the HDD to the USB drive with integrity checking. I thought about copying everything over and then checking with md5summer but this would take a reaally long time because its a lot of data and this is not a very powerful PC.

What tool can use to do this on Linux?

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up vote 1 down vote accepted

I have used ddrescue and dd_rescue for this. (They are two different programs).

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