Union mount of block devices?

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Hi all,
    sorry to bother the ml but I'm not able to find the answer via Google.
    Quick answer: is it possibile to stack block devices as union
mount? Something like /dev/sdb1 (ro) below /dev/sdc1 (rw)?

    Long story...
    I've got a partition with the begin of the journal over a few bad
blocks (by the way, it's NTFS but it doesn't matter), so it is not
    possible to fix/replay journal, and so on.
    I can dd/dd_rescue the partition to file/partition and fix/recover
all, but I just need to suck some files, so it would be a lot
easier/quicker
    to stack a good partition (rw) over the bad one (ro).

Thanks a lot for your time,
Andrea
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