Disk Cloning with DD - Questions

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https://bbs.archlinux.org – The copy's size depends on zeros there are in you hard drive, I mean is easy to compress a lot of zeroes. But I don't know if when you uses it, saving, loading, deleting archives it comes to zeroes or not, because it just change the pointers in the file system and didn't make zeros in the blocks. So, maybe, you at last need almost the size of the HD.You don't need a preformated drive, it is a exact copy (a clone). Every block finish in the same place that the original. So you need a HD to do the restore, equal  o greater.(I think it works, but now I am not sure) Too, y (HowTos)