External firewire disk partition will not mount

I have two external hard drives connected by a firewire to my 2002 G4 iMac running OSX 10.3.9. One is a 160GB and the second a 360GB drive.
I was out of the room when the area experienced a minor power drop in voltage and when I came back the iMac had the message to shut down and restart. When I restarted everything appeared normal until I realised that one partition did not mount on the 360GB drive. I ran Disk Utility to check the disk and it found some issues (I failed to write them down..) but Disk Utility appeared to fix them.
The disk has 2 partitions and only one of the two partitions will not mount (the second partition works fine!). Disk Utility says that both partitions check OK.
I have rebooted several times. I have removed all other external attachments and rebooted but still the partition will not mount.
I cannot see the partition in Finder. The second partition on the disk is available to see and use in Finder.
I have selected the partition in Disk Utility (grayed out) and tried the "mount" button but nothing happens. For some 18 months up until now the drive has worked fine although I did notice a couple of times it took a while for the drive to open up in Finder and other applications. I use that particular partition daily, it has approx 100GB used of the 150GB total space.
When I ran Disk Utility it comes up with a variation in the results compared with the partition that has mounted OK. The result of running "Verify Disk" is listed below. The only diffeerence between the two partitions is the first line of each volume. Does the ",0" following "Checking HFS Plus volume." for the first partition called "Genesys1" indicate anything?
DISK UTILITY REPORT
Verifying volume “Genesys1”
Mounting Disk(S,"Checking HFS Plus volume.",0)
Checking Extents Overflow file.
Checking Catalog file.
Checking Catalog hierarchy.
Checking volume bitmap.
Checking volume information.
The volume Genesys1 appears to be OK.
Verifying volume “Genesys2”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking Catalog hierarchy.
Checking volume bitmap.
Checking volume information.
The volume Genesys2 appears to be OK.
2 volumes checked
2 HFS volumes verified
Any help would be appreciated.
Regards

Hello! Power failures are murder on disk drive directories as you have found out. Your best shot is to get DISKWARRIOR. It is the "gold standard" for these types of problems and can usually resolve the issue when Disk Utility cannot. As with any utility there are times when even it cannot fix things but it's the best there is at resolving such issues. Tom

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I'll attach a screenshot of DU.
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Nov 7 08:35:46 ***-mac-pro.local com.apple.SecurityServer[27]: Succeeded authorizing right 'system.volume.internal.mount' by client '/Applications/Utilities/Disk Utility.app' [973] for authorization created by '/Applications/Utilities/Disk Utility.app' [973] (100013,0)
Nov 7 08:35:46 ***-mac-pro.local com.apple.SecurityServer[27]: Succeeded authorizing right 'system.volume.internal.mount' by client '/usr/sbin/diskarbitrationd' [15] for authorization created by '/Applications/Utilities/Disk Utility.app' [973] (100002,0)
Nov 7 08:35:47 ***-mac-pro kernel[0]: NTFS driver 3.10 [Flags: R/W].
Nov 7 08:35:47 ***-mac-pro kernel[0]: NTFS volume name BOOTCAMP, version 3.1.
Nov 7 08:35:47 ***-mac-pro kernel[0]: NTFS-fs error (device /dev/disk3s3, pid 5414): ntfs_lookup_inode_by_name(): Directory index record with VCN 0x3 is corrupt. Corrupt inode 0x5. Run chkdsk.
Nov 7 08:35:47 ***-mac-pro kernel[0]: NTFS-fs error (device /dev/disk3s3, pid 5414): ntfs_windows_hibernation_status_check(): Failed to find inode number for hiberfil.sys.
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Nov 7 08:35:47 ***-mac-pro kernel[0]: NTFS-fs error (device /dev/disk3s3, pid 5414): ntfs_inode_attach(): Failed to load inode 0x9.
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Nov 7 08:35:48 ***-mac-pro.local com.apple.SecurityServer[27]: Succeeded authorizing right 'system.privilege.admin' by client '/Applications/System Preferences.app' [5297] for authorization created by '/Applications/System Preferences.app' [5297] (100012,0)
Thanks,
Josh

Josh,
I will defer to Christopher on correcting the GPT, but I agree it is incorrect. On a much simpler, single disk Macmini with Bootcamp...
sudo gpt -r -vv show /dev/rdisk0
gpt show: /dev/rdisk0: mediasize=500107862016; sectorsize=512; blocks=976773168
gpt show: /dev/rdisk0: Suspicious MBR at sector 0
gpt show: /dev/rdisk0: Pri GPT at sector 1
gpt show: /dev/rdisk0: Sec GPT at sector 976773167
      start       size index contents
          0          1         MBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34          6
         40     409600      1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     409640 725093952      2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
725503592    1269536      3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
726773128        632
726773760 249999360      4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
976773120         15
976773135         32         Sec GPT table
976773167          1         Sec GPT header
sudo fdisk /dev/rdisk0
Disk: /dev/rdisk0          geometry: 60801/255/63 [976773168 sectors]
Signature: 0xAA55
         Starting       Ending
#: id cyl hd sec - cyl hd sec [     start -       size]
1: EE 1023 254 63 - 1023 254 63 [         1 -     409639] <Unknown ID>
2: AF 1023 254 63 - 1023 254 63 [    409640 - 725093952] HFS+
3: AB 1023 254 63 - 1023 254 63 [ 725503592 -    1269536] Darwin Boot
*4: 07 1023 254 63 - 1023 254 63 [ 726773760 - 249999360] HPFS/QNX/AUX
diskutil list /dev/disk0
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            371.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data BOOTCAMP                128.0 GB   disk0s4
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We were thinking along the same lines. While at home I dug up a firewire enclosure and put a bootable GUID formatted drive in it (that I had in one of the usb enclosures) and started her computer holding down the option key and then chose to boot from the external firewire. All usb drives are now mounting upon connection. I asume that her drive has bad sectors on it (even though the SMART status says it's OK) and is not loading all the drivers properly for USB to mount. I was suspicious from the beginning that the OS was corrupt when she first had me look at it. It was at that point that I booted it in target mode, connected to my Macbook Pro, and then CCC'd to a usb drive that I had. I then had a couple of difficulties installing the new OS. Should have known......
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I also have SpeedTools. But although it sees the drive I cannot do anything with it. None of its tools run more than a spli second before they fail.
This drive has USB 3.0 and I see everything through USB that I see through Firewire. Connecting the other way did not get around the problem.
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I took the problematic hard drive and installed it in my Mac Mini so I could attempt a Safe Boot and then Archive and Install if necessary.
Safe Mode didn't work. The drive produced the circle with a slash symbol.
I reset the PRAM which was part of a list of steps to work through I found created by Apple Support.
I was able to boot up to Verbose Mode and view the text of the boot process. I wrote it all down. I can answer questions about the content better than typing it all out exactly. It includes, "...journal magic is bad..." "...failed to open..." and ends with "...cannot mount root, errno = 19"
I attempted Archive and Install however when it went to show what target drives were available it was a blank box and all buttons were grayed out.
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It still would not mount. I ran Verify again and again said "Invalid content in Journal" and this time it stopped midway saying "The volume was found corrupt and needs to be repaired. Error: This disk needs to be repaired. Click Repair Disk."
I clicked Repair and it ended with The vol. was repaired successfully."
Still unable to mount I began repeating Repair over and over. Each time it found something to repair and ended with a success message. After several more Repairs I tried Verify and it stopped midway saying to Repair the disk.
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The step by step instructions I downloaded mentioned running Repair more than once but it did not say that running it 20 times would erode some problems and eventually lead to a fully repaired disk (if the problem was something DU could take care of in the first place). At this point I have run Repair about 20 times total with a series of 10 back to back skipping Verify. I keep seeing the lines about invalid content in a journal and that it repaired something successfully. Yet I still cannot mount the disk.

External firewire disk partition will not mount

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