How can I mount 2nd Hard disk (IDE)

From: Kenwey (yeskw_at_ms15.hinet.net)
Date: 09/23/04

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    Date: Thu, 23 Sep 2004 16:13:16 +0800 (CST)
To: freebsd-stable@freebsd.org

    I get a warning message when I boot my FreeBSD 5.1, it shows as follows:

    Detecting Primary Master ...WDC WD400JB-00ETA0 (40GB, running FreeBSD 5.1)
    Detecting Primary Slave ... None
    Detecting Secondary Master .WDC WD400BB-32CXA0 (40GB, /lib can't work well)
    Detecting Secondary Slave ASUS CD-S520/A
    SMART Failure Predicted on Primary Master: WDC WD400JB-00ETA0
    WARNING: Immediately backup your data and replace your hard disk drive
    A failure may be imminent.
    Press F1 to conitnue, DEL to enter SETUP
    02/16/2000-VT694X-P4V4X-00

    I turn off the machine, and pull it (WDC WD400JB-00ETA0) from
    master and connect it to slave, then I do the following to backup :

    # mount -r /dev/ad2s1a /mnt

    it shows: incorrect super block

    # disklabel -r ad2

    the last line shows "super block 0"

    do anyone know how can I repair it? is there any way to backup the data
    from this device?

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