Network drives volumes will not mount

Hi can anyone help me. At my wits end here. Have upgraded 2 machines in our office. 1 Intel Pro mac and 1 Intel iMac, upto 10.6.6
Problem is now when i log onto the ehternet network server drives or random LOCAL USB drives (basically anything external) the connecting machines restart the desktop environment and refuse to mount the drive or folder in question, sometimes it can be infinite loop style reload of the desktop until it finds what its looking for or not. Not all the time just occasionally. Have re installed the combo update but still not fixed it. Could it be a faulty Snow Leopard disc?
Should have mentioned that the server machine is running 10.4 and was running perfectly with the machines on 10.5, so presuming its not that rather the snow leopard upgrade..
Message was edited by: smuuudge

I am having the same issue at our school district. If i wipe out the account and network folder, then recreate it individually it works on both Mac and Windows. So definitely on the server end.

Similar Messages

Volume will NOT mount

We have much the same issue as others here in other threads have spoken about - after a reboot a raid volume will not mount.
Disk Utility can 'see' the drive and array, but will not mount it. RAID Admin reports no problems. I tried updating the firmware to no avail.
Then I tried a new FC card in the server, a different controller card in the xRAID, different cables and connecting the FC cable to a different XServe. No mount with any of these attempts.
XServe 2 ea 2.3Ghz G5, 2GB RAM, 1 80GB drive (cluster node config)
OSX Server 10.3.9
7 ea 180GB drives, RAID5; 1 TB array
RAID Admin 1.5 (controller firmware - now: 1.5/1.50f)
Any ideas what to try next? And no we don't have 100% backups, close but no... ;-( so any ideas worth trying appreciated!
Tks, Mark

Mark,
We recently had a similar problem. We have an XServe RAID fully populated -- split into 2 volumes. One volume would mount the other would not (after a reboot). Tried swapping fibre channel cables, re-seating fibre channel cards, etc. Our solution was replacing the PCI-Fibre card in the XServe.
Another thing we have had happen is, after reboot, one volume mounts and the other mounts about 15 mins later -- after completing fsck.
Hope this helps.
--Bonnie

Time Machine backup volume will not mount

Once I goy Time Machine up and running over almost two years ago, I have had little cause for concern. A few lengthy backups here and there but I have been able to restore without any problems whatsoever. It has been extremely useful many times.
A couple of days ago, I noticed that the backup volume was not mounted (I backup to one of my four internal drives) and launched Time Machine. I got the error:
The storage location for Time Machine backups can't be found.
When I run Disk Utility the generic disk icon is in the left hand pane but not the volume. None of the tasks are available except Erase and Partition - there is no option to Verify Disk, Repair Disk, Verify Disk Permissions or Repair Disk Permissions.
According to my logs, the last backup at 18:12 on 20th November was successful. I didn't notice that the volume had not mounted the until the next day.
I'm very concerned that I have lost almost two years of data security. Is there any way I can repair the disk or recover the backups?
Thanks.

If Disk Utility can't see any partitions, it's not good.
First, turn TM off.
Then try ejecting, disconnecting and powering the drive off for a few minutes, then reattaching it. Then try again with Disk Utility. If still no help, the drive is likely dead.
There's a very small chance that +Disk Warrior+ (version 4.1.1 or 4.2 only), or another heavy-duty disk repair app can fix it, if you already have one. But I wouldn't suggest spending the $$ for one unless you think you'll need it in the future -- DW is about $100.
Most likely, your disk is dead. There's a small chance that a +Data Recovery+ app such as +Data Rescue+ can recover some of the data. Check via Google, VersionTracker.com, or MacUpdate.com for +Data Recovery.+ There are services and apps, none cheap. Some of the apps have a free demo or test mode that will tell you if there's anything that can be recovered, and perhaps actually recover a single file; then you pay for it and recover whatever else can be recovered. You'll need another external disk to receive the recovered items.
You won't get the normal Time Machine folder structure, though, just "raw" files. Even if you do recover files, you'll most likely have to figure out what goes where and copy them to the right places manually.
So I'd suggest immediately getting a new drive and doing a new TM backup to it, so you have something. Put a second partition on it that you can use for the recovered files if and when you do that.
If those are your only backups, I'd recommend getting a second external, perhaps a portable one, and using CarbonCopyCloner or SuperDuper to make a full "bootable clone" to it, then take it to your safe deposit box, workplace, relative's house, or other secure location. And/or, you might want to look at Mozy, Carbonite, or other online backup services.

Xsan 4 will not mount volume on client

I recently upgraded my MDC and my client computer to Yosemite. I went through the migration process the best I could and created a Configuration Profile on my MDC for my client computer. I installed the profile successfully but the volume will not mount on the client computer. On the client computer within Profiles, the Xsan Configuration Profile has in red "Unsigned" underneath it, is that what is causing the problem?
Also a few notes: there are two other client computers that haven't been upgraded and are running Maverick and the volume does mount to those computers. The volume is also mounted on the MDC and if I go to Disk Utilities on the client computer I do see the volume, just not mounted.
Any help would be great! Thank you.

Thank you Claudio,
After doing much research and testing I believe you are onto something with my fsmpm or my .auth_secret file not being created. After using Server.app on the MDC I used the configure profile within Server.app. After installing the profile on my client computer it didn't mount and when looking within the Library/Preferences/Xsan folder there was no files (including the hidden .auth_secret file). So I then I used the web profile interface to create the configuration profile and this time it installed the fsnameservers and config.plist files but not the hidden auth_secret file and still no mount.
To answer some of you questions, I did try several times the "sudo xsanctl mount Volume Name" but had no success. I was previously running 10.9 on the MDC and my client computer. I am not sure if the MDC already had an Open Directory Master before upgrading and I did have a little bit of problems activating Xsan, because some of my DNS settings had changed. I got that all squared away and Xsan started working.
The reason I believe it is a fsmpm issue is because when I executed the command "sudo xsanctl i" (views the volumes connected to Xsan) I go a message reading "fsmpm not running error3". So after reading this forum Xsan: "fsmpm not running" message in Xsan Admin - Apple Support I copied the .auth_secret from the MDC to my client and still no mount. I tried again with all the files within Library/Preferences/Xsan folder and nothing. I then got the .auth_secret file from another client computer running 10.9 and still no mount, BUT when I copied all the files within the 10.9 client's Library/Preferences/Xsan the volume appeared! YEAH! But I'm not sure if this is a fix I should be happy with or continue to figure out why its not working the proper way? That way in the future I'm not running into this issue over and over again.
So I need to figure out either how to get my fsmpn running in 10.10 or figure out why my my Server.app on the MDC won't create the auth_sect file. I read somewhere that within the Xsan screen in the Sever app it should show the Authentication Secret, but I do not see this on my Xsan screen. Should it be there and if so is this where my problem steams from? Any thoughts? Thank you so much!

Xsan will not mount on clients

Xsan updated recently to 1.4. Problem started on 1.3 Working fine until reboot of one of the client computers. Now Xsan volume will not mount on any client. Updated to 1.4, ran cvfsck. Still no go. Volume is over 90%. I have read that this may cause issues. How can I get files off if I cannot mount? Thanks!

Try the following:
From finder -->Go --> Go to folder --> /Volumes
Delete the alias for the XSAN volume you want to mount.
For whatever reason the alias sticks even if the volume was unmounted. Below is an explanation from Apple.
Xsan mounts will fail if they have the same name
Xsan will not mount any volume that has the same name as any existing volume or folder located at /Volumes/.
Unlike some mounting mechanisms that automatically resolve name conflicts (for example, the Finder will append characters to each mounted volume name), the Xsan backend agent simply won't mount the volumes.
To avoid this issue, create a unique name for each volume to be mounted.

Hard drive will not mount shows up in Disk Utility

I have an external drive with a bootable OS X 10.6.8. I was in a transition between building up a SSD swapped drive. The SSD is installed in the CPU box but I have my old installation running from an external.
I have several external hard drives. They are all Firewire. Some have USB 3.0 and or eSATA options but my MacMini only talks to Firewire and USB 2.0.
I understand that you daisy chain Firewire drives and turn them on and off in sequence as they fall from the CPU box/case.
Firewire is a power source. I run the external with the OS using an AC adapter but one Firewire drive is powered through Firewire.
I have had as many as 4 external drives running along with the internal drive without a glitch while I was reorganizing files.
Today I booted off the external drive. It was running fine. I turned on one Firewire drive (the one that runs on Firewire power). That drive stumbled. I recognized the sound when there is an interruption in power. This cause the external boot drive to stall. I had to force a reboot.
Now the external boot drive will not boot up. It does not mount but Disk Utility sees it. The drive itself is bright and clear in Disk Utility but the partition (single) is faded out. I can run Verify and repair in DU. DU says it doesn't see anything to repair. It will not mount on its own or when I click the Mount button in DU. It does not produce an icon on the Desktop (because it is not mounting).
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.
Of course I will buy an AC adapter for every external drive and never run them using Firewire again but the horse is out of the barn.
I have the original installation disks and could run the Archive and Install option but it would require physically swapping drives with the internal. I'd like to avoid it if possible. It is a MacMini and tedious.
Any suggestions?

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.
I rebooted and opened Disk Utility from the DVD. The drive appeared the same with the top main line bright and the partitioned volume faded. Still was unable to mount. I ran Verify and this time a red line of text appeared "Invalid content in Journal" and at the end I ran Repair. When running I could read line by line and at one point it showed "checking volume information" then the following line "Repairing volume" the following line "Rechecking volume" more line of checking then it ended with "The volume was repaired successfully."
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.
Question: Does running Repair multiple times continue to correct bits and pieces little by little or is this a generic message and we should treat it as a problem Disk Utility cannot pinpoint and is just beating its head against the wall?
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.

Hard drive will not mount with 10.4 but will mount with 10.3

I have a G4 powerbook running on 10.4.11. There is a western digital my book external drive hooked up to the USB port. I have two partitions on it. I tried to change the group settings to read write and got an error saying I did not have permission. Now the first partition will mount, but the second which I tried to change will not mount.
Disk utility sees the drive but it is grayed out. DiskWarrior sees the drive.
I dragged out my old G3 running 10.3.9 and plugged it in. Works great. The disk drive partition mounts and all of the files are there. What do I need to do to get 10.4.11 to mount the disk partition?
The external drive is a Western Digital My Book 250G divided equally into two partitions. The partitions are in Mac extended format.

I'm having pretty much the same problem... Have a WD 500 GB external attached via USB. I can't say for sure that the WD caused this (wasn't paying close enough attention), but I've noticed that my own MacBook HD is no longer mounted. I can't seem to find anyway to accomplish this either. I've booted from another volume to run Disk Utility (repair/verify). I rebooted with the MacBook startup drive and still, no HD. And NOW I can't see the bootable partition I made on the WD external. What?
I feel like the opposite of a nerd, cuz I'm just scratching my head at this point. Oh yeah, and running 10.4.11...

External USB drives will not mount under Mountain Lion

Since upgrading to Mountain Lion, two external USB2 drives that I have will not mount and cannot be viewed in the Finder. The same occurs on a 2012 MacBook Air, a 2009 iMac 27 and a 2010 MacMini, all running OS X Mountain Lion version 10.8.2.
Both drives are Samsung Story external USB drives (one is 1.5 GB and the other is 2 GB) and both have been formatted using Mac Disk Utility with a single Mac OS Extended (Journaled) partition, one using Snow Leopard and the other with Lion.
Both still mount correctly on a friends MacBook Pro that is still running Snow Leopard, and I had no problem with the same drives under Lion. Interestingly both can also be connected to Time Capsule USB port and show up correctly.
Both drives mount correctly under Windows 7 on BootCamp partitions that I have on both the 2012 MacBook Air, a 2009 iMac 27. These BootCamp partitions have Paragon HFS+ installed so I can read Mac formated drives.
Both drives show up in Disk Utility, but when attempt to mount the drives I get the message "The disk could not be mounted. Try running First Aid on the disk and retry mounting." I can run Repair in First Aid on the disk and get the message that the volume appears OK, but again have the same problem when I attempt to mount the disk.
I have also tried using Disk Utility 3,2, but still cannot mount the drives, though the program indicates there is no problem with the drives.
I have other portable USB including a Samsung portable USB2 drive, and two external USB3 drives, and I don't have problems with them.
There is clearly a problem with Mountain Lion with accessing (mounting) these Samsung Story USB drives, and the problem appears to be with Mountain Lion itself as the problem did not occur on the same Macs with Lion and does not occur with Bootcamp partitions on the machines.
I have a lot of time searching forums, but I have not found anyone with an identical problem.
I sure hope someone can help or that Apple come up with a fix for this issue which has only developed since the update to Mountain Lion.

bj10au wrote:
Since upgrading to Mountain Lion, two external USB2 drives that I have will not mount and cannot be viewed in the Finder. The same occurs on a 2012 MacBook Air, a 2009 iMac 27 and a 2010 MacMini, all running OS X Mountain Lion version 10.8.2.
Both drives are Samsung Story external USB drives (one is 1.5 GB and the other is 2 GB) and both have been formatted using Mac Disk Utility with a single Mac OS Extended (Journaled) partition, one using Snow Leopard and the other with Lion.
Both still mount correctly on a friends MacBook Pro that is still running Snow Leopard, and I had no problem with the same drives under Lion. Interestingly both can also be connected to Time Capsule USB port and show up correctly.
Both drives mount correctly under Windows 7 on BootCamp partitions that I have on both the 2012 MacBook Air, a 2009 iMac 27. These BootCamp partitions have Paragon HFS+ installed so I can read Mac formated drives.
Both drives show up in Disk Utility, but when attempt to mount the drives I get the message "The disk could not be mounted. Try running First Aid on the disk and retry mounting." I can run Repair in First Aid on the disk and get the message that the volume appears OK, but again have the same problem when I attempt to mount the disk.
I have also tried using Disk Utility 3,2, but still cannot mount the drives, though the program indicates there is no problem with the drives.
I have other portable USB including a Samsung portable USB2 drive, and two external USB3 drives, and I don't have problems with them.
There is clearly a problem with Mountain Lion with accessing (mounting) these Samsung Story USB drives, and the problem appears to be with Mountain Lion itself as the problem did not occur on the same Macs with Lion and does not occur with Bootcamp partitions on the machines.
I have a lot of time searching forums, but I have not found anyone with an identical problem.
I sure hope someone can help or that Apple come up with a fix for this issue which has only developed since the update to Mountain Lion.
You can start here
http://support.seagate.com/kbimg/flash/213059/213059_EN.HTML
Pete

FireWire Drive in Enclosure Will not mount cleanly after installn Leopard

Help!
I installed Leopard and had a devil of a time and may have messed up my External 200 GB Maxtor drive in an Enclosure connected via firewire directly to my Mac.
Let me explain: I had a Maxtor internal 200 GB Hard Drive. I removed that drive and put it in an Enclosure connected with a FireWire Cable to my G4 QuickSilver desk top. I purchased a larger Seagate 500 GB Hard Drive and installed Leopard on it in the same internal slot where the Maxtor was installed previously. My other Internal Drive was a Seagate 250 GB Hard Drive on which I have Tiger with the latest update. Now I have two operating systems--one on the Sea Gate 250 GB with Tiger --and the other is a internal Hard Drive is 500 GB Seagate with Leopard on it. I now have installed two different version of MacOS X respectively. I select the boot drive in the System Preferences as I want to migrate to Leopard slowly due to the software programs that will require later updates with Leopard.
The external Maxtor drive now does not "mount" upon reboot like the other LaCie drives Firewire external Drives. If I toggle the drive "Power Switch" "on and off" the Maxtor in the enclosure is finally displayed on the desk top. A message comes up, that I *"did not eject the drive properly and I could loose data", "Initialize, Cancel or Eject"*. I choose "Cancel". Then the drive comes back to the desk top.
This all started up after I had to reinstall Leopard as Leopard would poll all ports and got confused--and took forever to install. I had to reformat the internal new Seagate 500 HD and wrote "0" on it and then installed Leopard on it from the DVD. It did not install properly the second time. I had to power down and disconnect all USB and Fire Wire peripherals including the Maxtor. Then I installed Leopard from the DVD and right away did the update. Finally Safari worked in Leopard. Then I reconnected all peripherals including the Maxtor.
Now the Maxtor does not display on the Desk top. When I toggle the external hard drive "off on" switch I found the "External 200 GB Maxtor data drive in an Initio Enclosure" on the disk top. In Disk Utility I tried to "repair" it and sometime that takes. It seems to have the data files on it--and I also run Disk Warrior and Tech Tools Pro. Tech Tools shows two mount points names "Disk4 Initio 6L20P0" and "Disk5 Initio L200P0". It also shows "Disk ID Disk 5s2" and also "Disk ID 4s2". I ran Both Tech Tools and Disk Warrior on it and Disk Warrior crashed during the rewriting of the Desktop during the first time I ran it.
This disk was an internal disk which I put into an enclosure but it worked previously as a data drive prior when Tiger was on a different drive. Ii worked OK as a mounted HD prior to my installing Leopard. After to installing Leopard initially on the new Seagate internal 500 GB Drive, Leopard would hang up in Safari after the initial installation.
I was on line with Apple Tech Support and I had to reinstall Leopard and do the update after reformatting the 500 GB internal Seagate. Now Leopard works OK except it does not display the Maxtor HD on the desk top. The Tiger works OK also except it also does not display the Maxtor HD on the desk top. I have to toggle the "off on switch" to get them to mount the Maxtor on the Desk top. That is when the message comes up about the "Initialize, Cancel or Eject".
What advise can you give me?
bobg

Well I am happy to report the solution to my F/W enclosure drive dilemma.
I had to do an archive and reinstall of Tiger from the DVD. Then I used the Combo updater as suggested by someone on this Group Discussion Forum to get my Maxtor F/W drive to mount and behave properly on my desk top.
I tried everything in between--but this seems to work OK for now.
After I installed Tiger as an Archive and Install from the DVD, I downloaded the Combo Updater to 10.4.11. I shut down and removed all items from my computer except the monitor and keyboard and Airport Extreme Base Station.
Then I installed the update.
I plugged in the connections including my Lacie FW external drives and they mounted easily. Then I plugged in the Maxtro in an enclosure. It mounted--as it had many times before.
Then I checked it in System profiler--and the drive and the Maxtor Volume name were displayed under the FW items in the Initio Enclosure. The other two Lacie F/W drives were also displayed.
I then jumped to Disk Utility and the drives were all displayed.
I selected the Maxtor and repaired the drive and one bad file count was detected and Disk Utility repaired it.
Then I shut down and rebooted into the Safe Mode. I opened the desk top and all drives were seen. This procedure apparently cleans out the caches and other items that might confuse the HD.
Upon reboot, I could see all 3 F/W drives and the 2 internal drives on the desk top.
Hopefully I am out of the woods--but now I have to make sure all my drivers and other items are back in service.
I have Photo Shop Elements 3 now working and so does my scanner aster I had to work on the scanner settings. My printer is still not printing yet from my scanner.
Most other items seem to work--including Safari 3.04.
I hope no one else makes that same mistake--always remove all items from your computer when a major update or install of a new Mac OS is performed.
This cost me 2 weeks of agony--including a spoiled Thanksgiving Holiday!!
bobg

External Drives will not mount

Hi guys ... this is my first post in these forums, so sorry if it is in the wrong category.
I have a Mac Pro, purchased in Feb this year. I have an iOmega Ultramax firewire drive, that is partitioned into four disks.
I have had time machine running well, and it backs everything up onto a second iOmega drive I have.
Yesterday, before I left for work, I saw TM was sbusy backing up. The finder was not responding but I just left it, as didnt have time to loko into it before leaving.
When I cam home last night, I saw it was still not responding, and TM was still trying to backup. All other apps were functioning fine.
I tried to force quit Finder and TM, but it did not work. I then shut down the Mac manually, and rebooted.
The problem has now arisen, where the partitioned drives will not mount at all. The TM backup drive is fine, and I can browse TM fine with it - so good to know all my data is backed up.
I looked at the logs in console, and see the messages saying that the drive cannot mount as it is dirty?
What I have tried as troubleshooting steps:
•Disk Utility to try and mount the drives, but they are not showing up
•Connecting the drive to my Mac Mini - still nothing.
•DiskWarrior - nothing. Only my TM backup drive and Mac HD show up.
•Running FSCK from Terminal. I can see the drives in /dev, but keep getting "Bad Super block" errors. When I try looking for another Super Block, it says nothing found, and would I like to run it manually? The same happens when run in single user mode.
•Unplugging the Mac and the drives from the Mac, waiting 5 mins, resetting the NVRAM and PRAM (booting up holding CMDPR and waiting for the second chime, shutting down, plugging in and turing n drives, rebooting ... nothing!
It seems as though I have exhausted all possible options.
I now accept that the drive is unrecoverable, and am relieved that the TM backups are OK. I am thus happy to format the drive and repartition it, then restore everything from TM. Will be a fairly big job, but at least the data is backed up.
The only problem I have, is I cannot even mount the drives to format them!
Is there any safe way of doing this over the command line. Or even better, has anybody gt any other advice as to options I can try?
I hope I have been thorough enough in my explanation here.
Thanks in advance,
Dave

The only problem I have, is I cannot even mount the drives to format them!
I have a feeling that the partition map is bad. Does the drive itself report to DU? If the drive does show up, you can select that, and click the Repair Disk button under the First Aid tab. If that doesn't fix it, with the drive selected, click the partition tab and re-partition the drive. After that, I would erase the newly created volumes with 1-pass/zero out option selected and restore the data that was on the external from TM.
If none of this works or if the drive itself (not the volumes) doesn't show up in DU, you either have a bad drive or bad controller in the external case. How old is the Ultramax? Just wondering if it might still be under manufacturer's warranty. I would check to see if you are still eligible from the manufacturer's warranty and get the whole external unit replaced. If you are out of warranty, I think it likely that you need to replace that external with a new one. I've had a drive go bad in an external case (this one I could still mount but the heads would 'freeze') and the controller on another external go bad (this one, the drive would not report to DU so I took the drive out of the enclosure, stuck the drive in another case and there was no problem with the drive.)

External Hard drive will not mount on desktop

I have a 17" Powerbook G4 that has replaced a broken iBook G4. I've been using a Western Digital MyBook Pro Edition as a secondary drive for my multimedia as well as my iTunes Library. It worked fine on the old iBook.
When I plug it into the Powerbook, using either USB2 or Firewire 800, it will not mount to the desktop. It DOES however appear in the System Profiler as "External HD Button and Lights". The drive is formatted for FAT32 and works fine on my Windows XP desktop machine, so I know the drive functions mechanically. A different hard drive, a Maxtor mounts to the desktop fine using USB2, so it isn't a bus issue.
This is driving me nuts. I LOVE this computer, but I have WAY more invested in music than the cost of the computer.
Thanks in advance.
Message was edited by: hempomatic

It took a while to figure it out but apparently there was a conflict with bluetooth. I disabled it and all is well.

After upgrading to Mountain Lion, my LaCie USB 3 drive will not mount

I just upgraded my OS to 10.8 and now my LaCie P'9230 USB 3.0 external drive will not mount. I have re-installed the USB driver and re-booted the computer and drive several times to no avail; any ideas/help?

mrfredmor_65 wrote:
I just upgraded my OS to 10.8 and now my LaCie P'9230 USB 3.0 external drive will not mount. I have re-installed the USB driver and re-booted the computer and drive several times to no avail; any ideas/help?
It's my understanding that LaCie hasn't released a Mountain Lion driver for their PCIe card yet. Sonnet uses a modified version of the LaCie driver and theirs is dead in the water too for that reason-they also warn that their driver won't work with 10.7.5 when it's released.
Indeed, yesterday I pulled the Sonnet USB 3.0 card from my Mac Pro and replaced it with a CalDigit card from OWC; CalDigit has separate drivers for 10.6, 10.7 and 10.8 and I can say that the card works with all three, the first time in 1.5 years that I've had a reliable USB 3.0 connection.

How do I repair a hard drive that was being written to while my MacBook Air crashed? (Drive will not mount)

My external backup drive will not mount. I have tried to mount it in Disk Utility via the app and the command prompt but the attempt times out. Any suggestions?
I backed up my HD the day before dropping off my Mac for repair, and then tried again just before going to my appointment. During this last and final backup my Macbook Air crashed. I have since discovered that the drive will no longer mount, likely due to the crash that occured during the last attempted backup. I am unsure if the drive can be repaired.
My logic board was short circuiting some where that controls the headphone jack. Initially this prevented me from using the jack but eventually caused my mac to crash several times before I brought it in for repair. I believe that it is the this crashing that is responsible for my back up not being accessible but that my data may still be intact.
Thanks for any help you may have!

If possible, attach it to another Mac and see if it is recognized in Disk Utility. If so, run Disk Utility>First Aid. If not, the HDD may be damaged.
Ciao.

Hard Drive will not Mount

I have a Seagate Barracuda 1.5 Gig installed in a MacPro as an additional drive and as of today the drive will not mount. Yersterday I noticed it ejected itself; I immediately rebooted and started to download the data to another drive but it ejected itself again after about 25% complete copy. I attempted to "verify drive" with Disk Utility but it was not listed. This morning it will will not mount. The drive is still under warranty so replacement is not an issue. Where I am at a loss is recovering the data. I fired up time machine and there was no data from this drive backed up (Bay 2). I checked the preferrences and the drive was not "excluded". So, I'm at a loss as to how or if I can recovery any data. I removed the drive from the MacPro and fired it up in a docking station (SATA) without results; still will not mount. Is recovering my data beyond hope? Any ideas or tips would be appreciated.
Thanks,
Koyangie

Hatter,
Tried Recovery Mode without success. Although the drive appears in Disk Utility I get an error after selecting Restore! If I click on the Image icon it will not list the contents.
There is perhaps .6 TB on this driver (images). After I posted and received yourt reply I took another look at my Time Machine and found all my data under Shared. What a relief.
Thanks for your advice. I'll return the drive to Seagate for a replacement. Hopefull I will be able to format it before sending it back.
Koyangie

External Hard Drive will not mount after upgrading to Yosemite

After upgrading to Yosemite, my external 3TB hard drive will not mount... can't see in Finder, but does appear in Disk Utility. Follow steps to Repair disk, but get a message that D.U. cannot repair disk.

See mount section.
Disk Unmount Using Terminal
Disk Utility – Force Mount Disk

Network drives volumes will not mount

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