Macintosh HD is a volume within an external disk

Hi. Apologies in advance for the lack of detail here, but it's a post on behalf of a friend.
He has recently performed a Leopard erase and install, and is finding that when waking from sleep performance is extremely slow. When repairing permissions he noticed another disk listed in disk utility, and I suspect that this is the external usb disk that he had temporarily used for backup (and is now no longer connected). The really weird thing is that he says that his Macintosh HD seems to be a volume under the external disk.
He says that he left the external disk connected during the erase and install. Is there any way that he can have made the internal hd a volume of the external disk? Is does seem to make sense that the performance problems may be caused by leopard looking for a disk that is no longer there.
If this is what has happened, is another erase and install the only way to recover? He can't unmount the external disk, without deleting all volumes on it, including Macintosh HD.

Hello Tom,
Macintosh HD seems to be a volume under the external disk.
If you open your Disk Utility and look at your Macintosh HD, it will appear as a volume underneath (indented from) the existing Hard Disk.
The name of that Hard Disk will be written. Have your friend do the same and then plug in the external usb disk. Is it the same name as his internal disk? No? Then this is not the culprit, and it would be rather bizarre if it was.
So if you could do a bit more checking and post more detail, we may find that there are other considerations to contemplate regarding his machine's slow performance.

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    +#+
    +#/dev/dsk/c1d0s2 /dev/rdsk/c1d0s2 /usr     ufs     1     yes     -+
    fd     -     /dev/fd     fd     -     no     -
    +/proc     -     /proc     proc     -     no     -+
    swap     -     /tmp     tmpfs     -     yes     -
    +/dev/dsk/c0t0d0s1     -     -     swap     -     no     -+
    +/dev/dsk/c0t0d0s0     /dev/rdsk/c0t0d0s0     /     ufs     1     no     -+
    +/dev/dsk/c0t0d0s6     /dev/rdsk/c0t0d0s6     /usr     ufs     1     no     -+
    +/dev/dsk/c0t0d0s4     /dev/rdsk/c0t0d0s4     /var     ufs     1     no     -+
    +/dev/dsk/c0t0d0s7     /dev/rdsk/c0t0d0s7     /export/home     ufs     2     yes     -+
    +/dev/dsk/c0t0d0s5     /dev/rdsk/c0t0d0s5     /opt     ufs     2     yes     -+
    +/dev/md/dsk/d100     /dev/md/rdsk/d100     /export/home/oak     ufs     2     yes     +-
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    d100: Concat/Stripe    Size: 53031888 blocks    Stripe 0: (interlace: 64 blocks)        Device              Start Block  Dbase        c0t2d0s7                   0     No        c0t3d0s7                   0     No        c0t4d0s7                   0     No
    +#+
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    flags           first blk       block count
    a m  pc luo        16              1034            /dev/dsk/c0t0d0s3
    a    pc luo        1050            1034            /dev/dsk/c0t0d0s3
    a    pc luo        2084            1034            /dev/dsk/c0t0d0s3
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    Part      Tag    Flag     Cylinders        Size            Blocks
    +0 root wm 0 - 134 100.20MB (135/0/0) 205200+
    +1 swap wu 135 - 307 128.40MB (173/0/0) 262960+
    +2 backup wm 0 - 2732 1.98GB (2733/0/0) 4154160+
    +3 unassigned wm 308 - 310 2.23MB (3/0/0) 4560+
    +4 var wm 311 - 580 200.39MB (270/0/0) 410400+
    +5 unassigned wm 581 - 985 300.59MB (405/0/0) 615600+
    +6 usr wm 986 - 2333 1000.47MB (1348/0/0) 2048960+
    +7 home wm 2334 - 2732 296.13MB (399/0/0) 606480+
    We try to clone disk using "ufsdump" command. The backup disk (cot1d0) capacity is like the capacity of original disk (c0t0d0) --> 2.1GB.
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    +# mount /dev/dsk/c0t1d0s0 /clone-root+
    +# cd /clone-root+
    +# ufsdump 0cf - /dev/rdsk/c0t0d0s0|ufsrestore -rf -+
    +# mount /dev/dsk/c0t1d0s3 /clone-s3+
    +# cd ../clone-s3+
    +# ufsdump 0cf - /dev/rdsk/c0t0d0s3|ufsrestore -rf - --> this command gave output "it is not ufsdump format"+
    # mount /dev/dsk/c0t1d0s4 /clone-var
    # cd ../clone-var
    # ufsdump 0cf - /dev/rdsk/c0t0d0s4|ufsrestore -rf -
    +# mount /dev/dsk/c0t1d0s5 /clone-opt+
    +# cd ../clone-opt+
    +# ufsdump 0cf - /dev/rdsk/c0t0d0s5|ufsrestore -rf -+
    +# mount /dev/dsk/c0t1d0s6 /clone-usr+
    +# cd ../clone-usr+
    +# ufsdump 0cf - /dev/rdsk/c0t0d0s6|ufsrestore -rf -+
    +# mount /dev/dsk/c0t1d0s7 /clone-export+
    +# cd ../clone-export+
    +# ufsdump 0cf - /dev/rdsk/c0t0d0s7|ufsrestore -rf+ -
    All dumping process were successfully done EXCEPT at /dev/rdsk/c0t0d0s3. It said that this partition is not in ufsdump format. I think because this partition is used as metadevice database.
    All dumping process were successfully done EXCEPT at /dev/rdsk/c0t0d0s3. It said that this partition is not in ufsdump format. I think because this partition is used as metadevice database.
    Afte install bootblk to c0t1d0s0, we tried to boot system using clone disk result (c0t1d0). We unplugged the original disk, and put the clone disk into target 0 slot (c0t0d0).
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    then REBOOT.
    But, after it, system won`t boot. the said that
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    */dev/md/rdsk/d100 /dev/dsk/c0t0d0s5 /dev/dsk/c0t0d0s7 = can`t check file system*
    please run fsck manually"
    we have run command "fsck". but the problem still there. System can`t boot. :-(
    But, while we put the original disk back, the system can run normally.
    Is there any steps that we are missing? Kindly need your help, please....we stuck. No idea...please response
    Thank you for any help and suggestion
    regarads,
    ferianto

    Sorry to hear.
    Other possibilities...
    Data Rescue...
    http://www.prosofteng.com/products/data_rescue.php
    (Has a Free Demo to see if it could or not, but you'll need another drive to recover to).
    rccharles on file recovery...
    "Stellar Phoenix Macintosh - Mac data recovery software, recovers data from damaged, deleted, or corrupted volumes and even from initialized disks."
    They have a trial version, so I guess you can see if your data can be recovered...
    http://www.stellarinfo.com/mac-data-recovery.htm
    FileSalvage is an extremely powerful Macintosh application for exploring and recovering deleted files from a drive or volume. FileSalvage is designed to restore files that have:
        * been accidentally deleted.
        * become unreadable due to media faults.
        * been stored on a drive before it was re-initialized/formatted.
    http://subrosasoft.com/OSXSoftware/index.php?main_page=product_info&products_id= 1

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