External drive error, does not mount: "Partition map check failed because no slices were found"

Hardware: MacBook late 2009 (2.26Ghz Core 2 Duo 2 GB RAM 250GB HDD) running 10.9.4, Hackintosh MacPro (3.29Ghz i3 16GB RAM 1TB HDD) running 10.9.4, external 3 TB Seagate Backup+ drive
As you can can see from the screenshot below,
The external drive was initially plugged in a Netgear WNDR4500 router by USB to be used as NAS. I was in the middle of updating the firmware when there was a power outage. Upon reboot, the drive no longer mounts, whatever it is plugged in (router, Mac, PC, etc.).
I ran DiskUtility on the partition map and volume, same errors. Here's an what I see:
As you can see above, the "Mount" icon is greyed out and I get the error message "Partition map check failed because no slices were found". If I select "the Archive" partition, the "Mount" icon is not greyed out but clicking it doesn't do anything. My HDD is basically unreadable.
I issued a few Terminal commands to see what was the problem, here are the results:
What can I do?
Currently running analysis on TestDisk and it is 50% after 48hrs. Need some help!

@ Allan Eckert: Unfortunately, reformatting is out of the question, I have 5 years of work on this!
@ Loner T: Yes, the firmware did successfully upgrade after router reboot and a bit of troubleshoot.
Thanks for the quick replies. Keep 'em coming!

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Seagate external drive: Partition map check failed because no slices were found

I have a 3TB Seagate Expansion external backup drive connected to my Retina Macbook Pro via USB. The disk will not eject from a regular Finder window - it will only eject from Disk Utility. Backups seem to otherwise be running fine. I tried to verify/repair the disk in Disk Utility, and I got the following error: "Partition map check failed because no slices were found." I am able to verify/repair the partition without any problem, and no errors are found.
I'm concerned about relying on a backup drive that may be heading south. Here is the output from diskutil info:
diskutil info disk3
   Device Identifier:        disk3
   Device Node:              /dev/disk3
   Part of Whole:            disk3
   Device / Media Name:      Seagate Expansion Desk Media
   Volume Name:              Not applicable (no file system)
   Mounted:                  Not applicable (no file system)
   File System:              None
   Content (IOContent):      GUID_partition_scheme
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported
   Total Size:               3.0 TB (3000592977920 Bytes) (exactly 5860533160 512-Byte-Units)
   Volume Free Space:        Not applicable (no file system)
   Device Block Size:        4096 Bytes
   Read-Only Media:          No
   Read-Only Volume:         Not applicable (no file system)
   Ejectable:                Yes
   Whole:                    Yes
   Internal:                 No
   OS 9 Drivers:             No
   Low Level Format:         Not supported

@ Allan Eckert: Unfortunately, reformatting is out of the question, I have 5 years of work on this!
@ Loner T: Yes, the firmware did successfully upgrade after router reboot and a bit of troubleshoot.
Thanks for the quick replies. Keep 'em coming!

Partition map check failed because no slices were found for WD My Book 1140 media

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External Hard Disc won't mount - Partition Map error. Can't repair with Disk Utility

Happy New Year all and thanks in advance for any support/advise.
I have some important data on an external drive that does not seem to want to mount. The drive is a 500 GB Seagate connected via USB. I am currently on an iMac 3.06 GHz Intel Core 2 Duo running Yosemity 10.10.1
What I've tried:
Multiple computers - connected the drive to various apple computers with the same result.
New enclosure: I have removed the actual HD from the enclosure and connected it using a new one.
Disk Utility: Verifying Disc reports the following error: 'Error: Partition map check failed because no slices were found.' Screenshot below:
I have searched this and other forums and run a few commands in Terminal that seem relevant to the issue, but am out of my depth in terms of interpreting the results. Thank again for your attention!!!
Commands run in Terminal:
diskutil list
diskutil cs list
mount
diskutil info disk1
Full Results pasted below:
diskutil list...
Ethan-Smiths-iMac:~ Ethan$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            999.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk1
   1:         Microsoft Reserved                         134.2 MB   disk1s1
diskutil cs list...
Ethan-Smiths-iMac:~ Ethan$ diskutil cs list
No CoreStorage logical volume groups found
mount...
Ethan-Smiths-iMac:~ Ethan$ mount
/dev/disk0s2 on / (hfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
diskutil info disk1...
Ethan-Smiths-iMac:~ Ethan$ diskutil info disk1
   Device Identifier:        disk1
   Device Node:              /dev/disk1
   Part of Whole:            disk1
   Device / Media Name:      ST950032 5AS Media
   Volume Name:              Not applicable (no file system)
   Mounted:                  Not applicable (no file system)
   File System:              None
   Content (IOContent):      GUID_partition_scheme
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported
   Total Size:               500.1 GB (500107862016 Bytes) (exactly 976773168 512-Byte-Units)
   Volume Free Space:        Not applicable (no file system)
   Device Block Size:        512 Bytes
   Read-Only Media:          No
   Read-Only Volume:         Not applicable (no file system)
   Ejectable:                Yes
   Whole:                    Yes
   Internal:                 No
   OS 9 Drivers:             No
   Low Level Format:         Not supported

Select the disk1s1 volume under the main drive entry, then click on the Mount icon in the Disk Utility toolbar if it goes active and see if a volume then mounts on your Desktop. If it does not, then you need to reformat the drive. And, you cannot access the volume in order to copy your data somewhere else. If you are willing to spend money on the problem, then you can always try using a software recovery utility:
General File Recovery
If you stop using the drive it's possible to recover deleted files that have not been overwritten by using recovery software such as MAC Data Recovery, Data Rescue II, File Salvage or TechTool Pro. Each of the preceding come on bootable CDs to enable usage without risk of writing more data to the hard drive. Two free alternatives are Disk Drill and TestDisk. Look for them and demos at MacUpdate or CNET Downloads. Recovery software usually provide trial versions that enable you to determine if the software would help before actually paying for it. Beyond this or if the drive has completely failed, then you would need to send the drive to a recovery service which is very expensive.
The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten.
Also visit The XLab FAQs and read the FAQ on Data Recovery.

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HT4527 After copying my iTunes library across from an external drive it does not show in iTunes. Why?

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Fri Aug 04 11:44:26 CDT 2000
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Cache performance for session cache
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null

Fixed both problems:
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Since 10.4.4 my external drive is no more recognized using firewire, but it mounts perfectly with USB
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It would be very munch appreciated..
thanks a lot for having read this long post..
External hard drive P/N:
the western digit disk 160G is in an enclosure referenced
Prolific PL3507 Combo Device
I tried to exchange the disk of this box with an old maxtor with the same bad result!
IbookG4 1.2 & IMac G4 700 Mac OS X (10.4.4)

Hi Andre, I can't remember except to say that it was mounting fine with tiger and I was able to copy files to it for backup purposes.
I just hooked it up to a PC and windows tells me the drive is not formatted. That's not a good sign, and this was stupid: I think I had the drive hooked up to my Mac Pro during the upgrade.
Idiotic, granted. But this was an upgrade, not a full install and I maybe was trusting in Apple's ability not to do extraneous stuff during an install like windows does. Oh well...
I appreciate any further ideas. Many Thanks, Frank.

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Have you written any data to the external drive? If not, perhaps you could add some data.
Are you using filevault?
You could reformat it in disk utilities.
Here is the path...
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Robert
Message was edited by: rccharles

My external HD does not mount despite it appears on Disk Utility

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Please help!!!!

If DiskWarrior can't fix it, you might try Data Rescue II...
http://www.alsoft.com/DiskWarrior/
http://www.prosofteng.com/products/data_rescue.php
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How do i repair or recover data from a corrupt USB external hard drive that does not show up on my Mac desktop or disk utility

How do i repair or recover data from a corrupt USB external hard drive that does not show up on my Mac desktop or disk utility?
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Thank you for responding.
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Folders that I copy from my Macbook to my External Hard Disk does NOT appear on any other drive that I connect the Hard disk to (TV, PC, ... etc.)

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Hi Simon. How is it formatted, FAT or NTFS?
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External drive error, does not mount: "Partition map check failed because no slices were found"

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