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Duplicate one hard disk partition to another hard disk

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Using dd to duplicate one hard disk partition to another hard disk:
dd if=/dev/sda2 of=/dev/sdb2 bs=4096 conv=notrunc,noerror
Replace /dev/sda2 and /dev/sdb2 with your partitios.
Note that notrunc means do not truncate the output file. Noerror means to keep going if there is an error.
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