External hard drive won't mount any more

I do a daily backup of the data on my internal HD to an external HD via FireWire. For some reason, the backup froze tonight - 10 minutes went by with no change in the progress. The only way I could get out of it was to quit everything, Force quit the ones that wouldn't respond, then reboot.
The internal HD is fine, but the external HD that I back up to won't mount now. I ran Disk Utility, and it sees the drive, but the Finder doesn't. In Disk Utility, if I click on "Verify Disk," I get this message:
Verifying volume “FireWire Disk”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
The volume FireWire Disk needs to be repaired.
Volume check failed.
Error: The underlying task reported failure on exit (-9972)
1 volume checked
0 HFS volumes verified
1 volume failed verification
Does this mean I have lost everything on the external disk? What do I need to do to get that disk running and mounted again? There were other files on the external disk, besides the backup. There were some large video files that I will have to capture from tape again if they cannot be recovered.
Thank you for your help!

Cornelius,
Thank you for your reply. I was able to get out of the situation through luck. I read on another forum a post by someone in a similar situation, and they said that the drive would mount on a different Mac. So I tried plugging in the drive to my old iMac, and sure enough it mounted, although when Disk Utility was run, the same error message was given.
Fortunately I was able to copy the files I need from the drive to the iMac's internal drive. The copy worked even though there was obviously a problem with the external drive. Then I erased the external drive using Disk Utility, and copied the files back onto it.
So I'm back where I started, and I didn't lose any files that I really need. But it was pretty scary for a while - I thought I would have to re-do a lot of work. Fortunately I don't, but I realize how valuable it is to have a second backup in case the first one fails. I am now going to duplicate everything onto the iMac's drive until the project is finished and I can archive it all. I still don't know how the disk got so messed up, and I'm surprised that a disk can get corrupted so easily.

Similar Messages

External Hard Drive Won't Mount- Need to recover files

Hello Everyone,
I am hoping that one of you fine mac experts may be able to assist ~
Problem: External Seagate FreeAgent Desktop USB external hard drive
won't mount on desktop=ie: no access to my important files.. Please Help!
Details:
External seagate freeagent 500 GB Desktop USB HD ( only 2 months old)
(using for document / file backup-not as a startup disc)
on my Mac G3 350 MZ Blue & White Tower /768 ram/ running OSX 10.1.5 & OS9.2~
~
Problem: Started using the external 500 GB HD 2 months ago -with no problems-until this morning. Tried to double click to open it to access files
and got the "beach ball of death" and needed to restart.
My trusty G3 started up fine, however, the external HD was now
not showing up on the desktop as normal. I troubleshooted -by restarting,
trying different a/c plugs/ different USB ports , ran disk utility..called
seagate -not much help . Seagate said to try the HD on another mac-which I did-
a G5 tower- same problem.
~
The External hard drive will show up in disk utility, but is grayed out.
and when click "mount" same two messages keep showing:
message 1: "a disk attempting to mount as unknown has failed verification or has failed to
mount.please use disk utility to check the disk"
~
message 2- when unplugging and repluggin the usb in-and upon
restart:" you have inserted a disk containg no volumes that mac osx
can read to use unreadable volumes,click initialize to continue with the disk inserted ,click continue"
~
( I really need access to these files- and do not want to re-initialize the HD!!)
I ran Disk Utility /first aid "verify & repair , the following info came up:
Repairing disk "main backup 2007 ".
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid key length ( <<<IN RED )
Repair completed. "
~~
Though it said the repair was completed, the "invalid key length" issue
still comes up when re-running disk utility...Hard drive would still not
mount on desktop-even after restarting .
~~~~~
If there is a mac genius out there that can help?- it would be greatly
appreciated. I have tried to call seagate several times in the last several hours-
1st time-they disconnected me after being on hold 10 minutes-2nd call
I was put on hold for 40 minutes ..Finally spoke to someone ( they are not mac users or mac experts!)and he said I would need to send it to Seagate's Data Recovery-... for a fee of course!
~~~
At this point, I am hoping to just get the files and photos off
the hard drive- I heard about Disk Warrior-should I use that and if so
what version?
Thank you very much!
L

Will zapping the PRAM be of any use in getting the external to mount on the desktop?
Your external Hard drive is already recognized. But it cannot be mounted on the desktop due to its directory damage. You can certainly Zap the PRAM, and it will not hurt anything, but I am skeptical that it will change the situation.
Do you think the Disk Warrior 4.0 cd will even work on my G3 350MHZ running Mac OS 10.1.5?
If you boot from the CD and run it from the CD, absolutely yes. If you attempt to INSTALL it from a download or a CD, probably not.
Have you ever used Disc Warrior and is using it complicated?
I own and use Disk Warrior. You select the drive to be rebuilt, it builds a proposed new directory from the information and file fragments available.
When complete, it will provide a list of problems encountered, tell you what files have been placed in the "Rescued Items" folder, and allow you too look at your drive using the proposed new directory. Your only decision is whether the new directory seems to be an improvement over the old \[in your case, hopelessly corrupted] directory. You then tell it whether to replace the old directory with the proposed new directory, or to abandon its work and leave your Hard Drive unchanged.
Is there a good chance that the ext HD will still have my files on it- or do you think from what I've described that they are gone ?
From what you have described, your files are very likely to still be there. Sometimes in a situation like this, a handful of files cannot be recovered.
My other thought was to take the external HD there and have them try to recover the files.
Make sure you completely understand the costs involved. File recovery using a service like DriveSavers can run into many hundreds of dollars. They are prepared to disassemble your drive in a clean room and replace controller boards and read/write heads to achieve success. Your drive has serious, but not fatal, Directory damage. The Hardware, and most of your files, are likely just fine.

External hard drive won't mount, even after disk repair.

My Toshiba external hard drive won't mount on my MacBook Pro 10.8.5. I can see it in my disk repair, and when I repair, "the partition map appears to be ok." But I can't access the icon to be able to open the hard drive contents on my desktop. Help!

Hello maccynicwhoalwayshasmacs,
Thanks for the question. After reviewing your post, it sounds like trouble with an external HD mounting. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
USB and FireWire Quick Assist
Thanks for using Apple Support Communities.
Have a nice day,
Mario

External Hard Drive won't mount on desktop!

Hey, guys.
I ran into a problem this morning that I've never ran into before and I wasn't sure where to write it but I thought this is best.
Here it goes...
Last night I had a power surge and when I restarted my computer, my external hard drive did not mount on my desktop. I than proceeded with restarting my computer, I relinked all my connections and I cant seem to get it fixed. I have a lot of material on my external drive that I dont have backed up (I know, a stupid move) anyways, I dont want to lose that information. Also, when I open up disk utility, the icon for my external drive is there and the partition I made for my external drive shows up also but the title of my partition for my external hard drive is not in bolded font. I tried to click the button to mount my external drive cause the specs tell me that it is not mounted but when I press the mount button, it does nothing. I than tried clicking the unmount button and than restart my computer and still nothing.
What problem am I facing and how can it be fixed?
Thanks.

Dear Jason,
Gary's advised is, IMHO, a very sound one.
The only thing I can think of about your problem, given the information you have provided us, is to run Disk Warrior on your external HD.
In fact, DW is particularly indicated in events, like:
"...you should run DiskWarrior when you suspect that there is directory damage on one of your disks. Directory damage can result in the disk not mounting (not appearing on the desktop when the computer is started), missing files or folders, an inability to move or copy files, or crashes when files are used...".
You could actually buy your copy of DW Licence on-line and download it directly onto your internal HD, starting from this "Information you must read before you make your purchase" page. A hardware copy of the software you have so purchased, will follow by postal service (or currier, if so you choose), shortly.
Follow all the instructions you will find in the download to install the DW software onto your main internal HD and then run it on your external hard drive.
DW has saved my data several times and in similar situations as you are experiencing. IMHO, you should seriously give it a try and, even in the unfortunate event it does not manage to solve your problem, it is one of those Mac OSX utilities which ANY Mac power user MUST have handy at all times.
So, no matter what, my opinion is that it is always well-spent-money those used to purchase your copy of DW: in the long run, you won't regret it.
In the event that even DW is unable to retrive your precious data, my suggestion is to contact Micro Com data recovery. It's going to cost you some money, but if you make a leaving out of the data you've lost on your external hard drive, it's going to be worth it.
All the best.
Costa

New partition on external hard drive won't mount

I have an 2TB external drive connected by FireWire to my 24-inch, Early 2009 iMac. I created 2 partitions 1 that is about 35 GB and another that is the rest of the 2TB. The 2nd largest partition mounts fine and is being used by Time Machine for my back up. The 2nd one I wanted to use for a Tech Tool Pro eDrive. However the 35 GB drive won't mount. Well it mounts, but after a few seconds it unmounts itself. This is the message I get as it unmounts itself:
8/18/13 7:18:45.788 PM fseventsd[43]: Events arrived for /Volumes/eDrive after an unmount request! Re-initializing.
8/18/13 7:18:45.789 PM fseventsd[43]: creating a dls for /Volumes/eDrive but it already has one...
8/18/13 7:18:46.039 PM fseventsd[43]: disk logger: failed to open output file /Volumes/eDrive/.fseventsd/00000000030d4f84 (No such file or directory). mount point /Volumes/eDrive/.fseventsd
8/18/13 7:18:46.039 PM fseventsd[43]: disk logger: failed to open output file /Volumes/eDrive/.fseventsd/00000000030d4f84 (No such file or directory). mount point /Volumes/eDrive/.fseventsd
Any ideas?
I've checked the partition with Disk Utility and no errors.
Regards,
Chris Johnson

If the drive has more than one interface (USB, FireWire, Thunderbolt, eSATA), try one of the other interfaces.
Check that the data cable is securely inserted at both ends.
Try a different cable.
If you're connecting the drive through a hub, connect it directly to a built-in port on the Mac.
If you're connecting it directly, try a different port.
Disconnect all other devices on the bus, or as many as possible.
Test the drive with another Mac. Test another drive with this Mac.
If the drive is bus-powered, but has an AC adapter, connect the adapter.
Boot into Recovery and launch Disk Utility. Does the volume mount?
Start up in Safe Mode and test.
If the drive doesn't work under any of the above conditions, and if another drive does work with the same Mac, then the drive has failed. You may be able to salvage the mechanism by removing it from the enclosure and installing it in another one, or in a drive dock.

External Hard Drive won't mount - tried Disk Warrior, am backing up as a .dmg...will this work?

Hi Guys,
Hopefully someone can help! Fairly desperate situation here...
I backed up around 700GB of data to an Iomega external hard drive (supplied by the client), using my Macbook Pro...all was fine when I unmounted the drive at the end of the backup.
The client took the drive away and called me to say he mounted the drive in Windows (on a PC), and he was able to work with the files for a time, but now the drive won't mount...
I collected the drive, hooked it up to my Mac Pro, but OSX tells me it can't mount the drive. It shows up in Disk Utility in the sidebar, but not on the desktop...
I tried repairing the disk using Disk Utility and with Disk Warrior, both tell me the disk cannot be repaired...
I am currently making a backup of the drive as a .dmg file, using a program called Disk Drill...it's slow as I expected, but I'm still not sure the .dmg will mount...because surely it's just making a copy of the data exactly, of which some part is not mounting (a mount directory or something???)
Is there any way you guys can think of me somehow taking the data and backing it up onto another disk?
Specialist recovery services seem to think there shouldn't be any problem recovering the data, and of couse, as a costly last resort, that's what I'll have to do, but does anyone know how they may go about doing it? It is something vastly complicated such as a command line thing?
Sorry about the length of this question...just hope someone can help!
Thanks in advance...

You didn't say what format (filesystem type) the disk was.
However, I'd say your analysis is probably correct. Something has corrupted the disk. You can make a disk image copy to the .dmg which will preserve the data, such as it is, but I doubt extremely if it will fix any file system corruption.
Furthermore, if both Disk Utility and Disk Warrior have said the disk is unreadable I'm dubious that anything else will magically repair it and that recovery probably consists of snuffling through the disk block by block.
However if the filesystem is FAT (Windows) there may be other (Windows) utilities that can fix it.
You said you 'backed up the data'. Does that mean you still have the original data on your MBP? Are you trying to recover the client's changes?

Western Digital My Book Studio II external hard drive won't mount on Mountain Lion

I have the Western Digital My Book Studio II external hard drive. It was working fine. After upgrading to Mountain Lion, the disk does not mount. I can't find any help on the Western Digital site. Has anyone else run into this? Is there a solution?
Immediately, I'm more concerned about getting the data off this drive than getting it to work. If I take it to an Apple Store with another external drive, could they transfer the data to it for me?

Also, check the Western Digital website for software updates. They have made numerous updates recently.
http://support.wdc.com/product/download.asp?wdc_lang=en
Firmware update for Mac users
Mac release 3.1.0.10E (updated 9/4/2012)
See: http://www.wdc.com/wdproducts/wdsmartwareupdate/firmware.asp?id=wdfGeneric&os=ma c
WD Universal Firmware Updater Release Notes 1
WD Universal FW Updater 3.1.0.10E: Fixes:
• Added additional drive support.
WD Universal FW Updater 3.1.0.10D: Fixes:
• Now works with 10.8 Mt. Lion.

G-Raid external hard drive won't mount -- have tried almost everything!

My iMac (Intel , OSX 10.4.11) has been happily working with my G-Raid external hard drive for over a year. But now, after the computer cord was disconnected yesterday, it refuses to mount the G-Raid or recognize it anywhere. Can't find it in the Disk Utilities or under "About this mac -- Firewire." Called Apple service and tried everything the agent recommended...PRAM diagnostic reboot, power surge, plugging, unplugging...nothing helped. The problem isn't with the G-Raid, which works fine plugged into my old Powerbook with the same firewire. Grateful for any help, as I really need the G-Raid -- it's got all my projects, music, photos....

Can you plug it in with a USB cable on your iMac? That might get you through your crisis and even resurrect your Firewire connection. Accidentally breaking the connection on my external Firewire drives happens too often as the connector doesn't make a snug fit compared to USB. It's not a problem unless there was something in your buffers at the time the connection was broken. You may need to Repair the drive using Disk Utility when it eventually reconnects or all may be well without more intervention.

1Tb External Hard Drive won't mount

I've owned a 1Tb Seagate external hard drive for about one year, and I've installed the software that comes with it for what I thought would be "peace of mind" (now I know to reformat, but my problem is that there is content I would like to save first). I have used it mainly as a scratch disk when I work with big files, and I've never gotten to more than 25% of the total capacity in saved data. A week or so ago I was about 30 min into the work day when suddenly the warning window for improperly ejecting USB came up, but the 1Tb was still plugged in. Since then I can no longer see the 1Tb drive anywhere but in disk utility, and the second icon for it looks lighter (grayed out). When I tried to mount the drive it says to run First Aid first—because the drive could not be mounted—which comes back with no problems, and it will still not mount. I have tried verifying and repairing permissions, which shows no problems either. I've tried Kext Utility 2.6.1, SMC, and PRAM without any luck. I've tried Tuxera NTFS, and even uninstalling Seagate's software, but I haven't seen any results either. The 1Tb runs normal, the light will turn on when plugged in, and it will go off when ejected, which also works without warnings. I have all the software up to date, but I have not been able to link my problem to the OS system update like others did since it had been done several weeks before the incident.
I have seen this problem a few times rolling around, but only a few lucky ones have been able to fix the problem. I am posting this because I have not seen anybody with the same list of unsuccessful attempts, but I am hoping that there is something else that can be done.
Thanks in advance

USB Ports can sometimes be funny like that. If you haven't already, these are some little things you can try:
- First things first, unplug all your usb devices. Try plugging a device that you're sure works on your MBPR over EACH of the usb ports (just to check if they're both working correctly & supplying power on the mac itself).
- Check the USB cable's A plug (the end that connects to the mac) and make sure both the contacts are clean, and that the crevass is free from dirt/lint buildup, as it can interfere with a proper connection. (This can happen if you store cables in cases or bags).
- Sometimes easing the USB plug slightly out from the computer may help mount certain devices. If it DOES mount (abruptly) after this, then see item above on making sure your cable is clean, or swap out usb cable as it may not be working properly & try again with a new cable.
- Lastly, some devices may need a firmware update to even connect, as with the cases of the Lexar USB3.0 Card Readers and some Seagate USB HD's some folks here are experiencing with their Retinas.
Here's another thread that may also be useful concerning an external Toshiba Canvio HD.
It's not much, I know, but hope this helps, if a little.

Fantom external hard drive won't mount

I am using an imac G3 with OS 10.3.9. Until yesterday my Fantom external hard drive mounted. I dismounted it and turned it off. I went to turn it back on later and it won't mount. I selected initialize from the dialogue box that says it won't mount and when disk utility comes up it show the two icons for the internal hard drive and just one for the external so I can't do anything with it. Thanks for your help.
imac Mac OS X (10.3.9)
imac Mac OS X (10.3.9)
imac Mac OS X (10.3.9)

Thought you could use this info about getting FireWire to work!
First, you should always Repair Permissions in Disk Utility before and after any update; I would do that now. If you installed your update with FireWire plugged in, your Mac may not recognize it anymore.
Try resetting your FireWire ports by disconnecting all FW devices, shut down your Mac and unplug it from AC power (wall socket) for 30 minutes. plug it back in and try FW.
If that did'nt work, download the combo update from this site (yours may be corrupt), not Software Update, disconnect all firewire + USB devices except keyboard + mouse, Repair Permissions, re-install update, Repair Permissions again + try. Yours is the 10.3.9 Combo update. Others reading, download the Combo that applies to your system.
If that still did'nt get it Zap the PRAM. While restarting Mac hold down the following key combo Command-Option-P-R. Keep holding those keys down till you hear the second start-up chime, then release.
For those of you with Macs that are not PowerBooks or iBooks, a bad internal battery can cause FireWire to not be recognized, so make sure it's good!
Good Luck!
Cheers!
DALE
p.s. Hi to you too Sherry! Keep up the good work!

External Hard Drive Won't Mount Via USB

I have a Western Digital (Model #WD2500...) Hard Drive that is about 3 years old. I initially set it up on a PowerBook running Mac OS 10.3.x. I have two newer laptops both running Snow Leopard, and neither will recognize my drive via USB 2.0.
The weird part is that the drive will mount when connected via Firewire (400 in this case). My newest laptop is on of the new MacBook Pros and it only has Firewire 800. I'm guessing I could probably get a 400 to 800 Firewire cable, but it would be much easier to just use the USB 2.0 connection. Any idea why the drive won't mount over USB 2.0?
I went to the Western Digital site, and there didn't appear to be any new drivers or firmware for this product. The drive seems to run perfectly well over the Firewire connection, so I don't see what the issue is with USB. The documentation that came with the drive indicates that it should work with USB. This is very baffling to me, so any help would be greatly appreciated.
Thanks so much!!

In most external drive enclosures that have both USB and Firewire interfaces, the Firewire interface is able to draw enough power to run the drive. Firewire can provide up to 45 watts and up to 30 volts of power per port (not all devices supply the full wattage; my MacBook model provides up to 8 watts). USB 2.0 and earlier can only provide 5 volts at 500 milliamps (up to 2.5 watts). Some newer laptop drives are at or under 500 milliamps, but just barely, and the enclosure itself needs some power.
It sounds like the USB port on your enclosure is bad. Firewire is going to provide faster transfer rates anyway, and you don't have to bother with the power supply. Based on your comments, I suspect it still might be a bad power supply, or maybe it's not the right one for the drive. Those things are easy to mix up.
If you're brave enough to crack the external drive open, what you'll find inside is a standard off-the-shelf hard disk drive, with either a SATA or PATA interface, in an enclosure. You can move the drive to a new enclosure easily.

WD 3.0 external hard drive won't mount to Mac

I've had this Western Digital 3.0 external for some time and now it won't mount. I'm running Yosemite on my iMac. Full disclosure, I did drop the drive a day before it stopped being recognized on the Mac but it wasn't a hard drop and the external drive was running just fine immediately after the drop. I've seen some posts on here talking about WD external drives not working after updating to Mavericks but I didn't have that problem.
I've zapped the PRAM.
I've made sure it wasn't the cable - I have another 3.0 drive that mounted just fine using that same cable.
This WD external drive is self powered so it's not a power source issue.
I've tried updating the Firmware but since the drive isn't mounting, that did no good.
The USB port on the Mac is fine - plugged in another drive and other devices in that same port and they are all recognized and working fine.
Just to make sure, I tried using another port. No different result.
I tried the Option key on a restart to get to Disk Utilities but it's not seen there.
While the drive was working, I was pulling music from iTunes to my iPhone, just loading it up for a trip. I keep all of my music on this one WD external hard drive. I loaded up about 70 songs and intended to load dozens more. While pulling some songs over, things froze up. Wasn't able to do anything in iTunes or, as best I recall, anywhere else. Things just froze. I hard restarted the Mac - via the power button - and since, the external drive hasn't mounted.
About ready to try this possible solution as described in this discussion:
Your dead external hard drive is likely fine! Great hope for your 'faulty' external HD
Soooooooo . . . help would be appreciated!

Hello
Ihad EXACTLY the same thing happen to my WD hard drive... MINUS the dropping.
Was organising my iTunes and iPhoto library, kept crashing, over and over again, then the last time, i restarted and it won't mount.
Except not only is the WD hard drive not mounting, after the crash and restart of itunes etc neither is my Time Machine hard drive which is connected via a LAN cable.
Exactly the same scenario, all the ports work, all the cables are fine etc.
Just went BOOM - not happy and stopped working.
All my photos and music are on this one drive.
Did you manage to fix your issue?

Two seperate external hard drives won't mount

HELP!
Neither of my external hard drives, both AC powered, suddenly won't mount. I've swapped all the cables and ports but no joy - it can only be the mac. Any idea?! Maybe I haven't mounted them since the last software/ security update, I can't remember...
I feel like everything is breaking down one by one and it always seems to be the result of an update.

Ok, a small amount of success.... I've figured out that it's the USB adapter (Apple - The one I got with my ipod). So I changed the fuse in the actual plug, and that works fine with the laptop charger connected but not the USB part of the adapter plug - the actual square adapter than hooks onto the plug... So what can I do about that? is there another fuse inside that? I can't seem to get it open - Do I just need to buy a new one?

External hard drives won't mount after upgrading to Tiger 10.4.9. Help!

Hi, I've just got the latest iMac. Very excited! I did all the software updates, connected my Western Digital extended hard drive so that I could copy some files over onto my new Mac. It was fine at first. Then when I wanted to open up the external hard drive icon on my desktop again and double clicked on it, everything disappeared from the screen for a few seconds, then reappeared but my external hard drive simply opened the window to my personal hard drive on the Mac. The WD links to my computer via Firewire. I then connected my USB external hard drive stick and it was the same story.
I used Disk Utility to test everything and everything was fine.
I then reinstalled Mac OSX 10.4.8 and plugged in my external hard drives. Everything worked perfectly. After copying over documents and a couple of programs, and downloading a few more programs, I ran my software updates again, upgrading the operating system to Tiger 10.4.9. I attached my external hard drive and it was the same problem all over again.
I the read up the online discussions and also chatted to an Apple dealer, and their advice was to download the Intel Combo and reinstall the operating system. I have just done this and my external hard drives will still not mount properly. Their icons appear on screen but double click them and everything disappears.
Please help. This is really frustrating as I have a backlog of work to do and I seem to be wasting hours on this. Not only that, this is a brand new machine which I rightly expect to work straight away.
I look forward to your response. Thank you in advance.

Hi, try to put your HDD in other Mac and look if appear the same, also you can try to repair permission.

WD external hard drive won't mount

Hello,
I have a WD my passport 1TB external hard drive that will not mount. It has two partitions, one is a time machine backup, the other contains critical files. I thought I was backing up this second partition via SuperDuper, but for other reasons it stopped doing it's backup two years ago, so I now have two years worth of critical files that are seemingly inaccessible (my bad). I have done all the easy stuff like try it on other computers, changed cables, changed ports, tried it on PCs and Macs (I have a 2008 MBP). I have also taken it out of it's case, and even switched out the PCB with an exact copy (through PCB Solutions in Canada). Not long after I replaced the board, I got access again to the hard drive (though not right away), I began copying files as fast as possible (which was slow) and got about 25% (51GB) of the drive copied (less corrupt files). This took a couple days.
Then I stupidly shut down the computer as the drive seemed to be getting hot and I thought it worth the risk not to fry the board/drive. Alas, the hard drive would not mount again. I have tried to access it through the Terminal, as it does show up there (after a couple minutes) if I do a diskutil list like this:
Melissa-McManuss-MacBook-Pro:~ melissa$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *512.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Melissa's SSD           511.1 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                                                   *1.0 TB     disk1
It does not show up in Disk Utility or Finder however.
It will show up in Disk Utility after the Finder gives up on trying to mount it. It shows up as "1TB WD My Passport 0171D Media", but does not show the partitions.
I have read other similar cases, I can tell you that the fsck. program does not show up in the Activity Monitor. So this is not my problem.
I am out of potential remedies, but am loathe to send it to the Data Recovery people if not absolutely necessary (for obvious reasons).
Thank you in advance for any potential help!

Your best bet is DiskWarrior,...
http://www.alsoft.com/DiskWarrior/
Hold option key or alt key when selecting when choosing Rebuild, then use Scavenge, that may make a temporary directory that can then be used for copying the files.
If DW doesn't even see it or work, then...
Data Rescue...
http://www.prosofteng.com/products/data_rescue.php
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
http://discussions.apple.com/thread.jspa?messageID=11073082#11073082

External hard drive won't mount any more

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