External hard drive won't unmount for disk utility.

Im not sure if this is the right topic area but I have a white macbook and my external hard drive won't unmount. I want to erase it via disk utility but it keeps telling me other programs are using it.

Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (for Intel Macs) or APM (for PPC Macs) then click on the OK button. Click on the Partition button and wait until the process has completed.

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I have an external hard drive that shows up in disk utility but Verify and Restore are greyed out.

I have an external hard drive that shows up in disk utility but Verify and Restore are greyed out. I am trying to determine what is wrong with the drive.
I need the data on the drive and it won't show up in Disk Warrior. I have tried different Mac's and different USB cords only to find the same outcome. When selected in Disk Utility the information read as such...
Disk Description : WD Elements 1023 Media                      Total Capacity : 500.11 GB (500,105,740,288 Bytes)
Connection Bus : USB                                                               Write Status : Read/Write
Connection Type : External                                                     S.M.A.R.T. Status : Not Supported
USB Serial Number : 575837314135304D36373132        Partition Map Scheme : Unformatted
As the drive shows in Disk Utility there must be some life left in it surely. There is a possibilty that the physical connection between the USB cord and the external drive is damaged but since the drive shows up I believe it's unlikely... before I give it to the pro's is there anything else I can do to diagnose the issue?

Hello,
I have just experienced the same thing!
Although my external drive shows in Disk Utility, it does not show in Finder.
And the Verify/Repair buttons are also greyed out.
Also, although the drive is 2TB. DU shows it as having Total Capacity of only 4.14GB! (Which should be the Free Space).
I was wondering if you solved your problem, & if so, would you share your solution.
I´m afraid to Erase in case I lose all my Data on the drive.
Thanks in advance for your reply!

Internal hard drives won't appear in Disk Util

I have a bizarre problem with my hard drives now. I'm on a 2.4GHz Core2Duo Macbook Pro 15" with 10.5.4. I've switched the hard drive a couple of times before with no issues whatsoever. Now, with the exception of the brand new one that won't hold an install, my internal hard drives don't show up in the install disk's Disk Utility.
I got a new hard drive to try the other day, installed it, booted to my OSX install disk to use Disk Utility. I switched the new disk to GUID and formatted it as journaled like usual. It took 4 hours to do the install, then after the restart it tanked. It booted back to the install disk where I checked it out. It could not repair the file system, and the drive was not "mounted". I mounted it, repartitioned and formatted it, and installed again. This time it stopped halfway through the installation and said the drive might be corrupt.
I unplugged the cable and battery, held the power button for over 5 secs, then just let it sit for about 10minutes with no power source while I thought about this. I put the original drive back in, booted into OSX, and put the new hard drive in an external USB enclosure. I formatted it while in OSX, then rebooted into the install disk and installed OSX on it while it was in the USB case. It took the installation more quickly (about an hour and a half...still not 20min like my old 7200rpm Hitachi 200g), then I booted into its OSX while in the USB drive. It booted ok, so I downloaded the updates and clicked to install them. It then went into a revolving restart. Eventually I decided it was not doing this because it was happy so I shut it off.
I swapped the hard drive out with another new one, and this one would not complete an installation while inside the computer either. It acted similarly while in the USB case. HOWEVER it would always show up as unmounted after a restart and would not recognize the drive inside the computer as a bootable disk.
I put my original drive in there to give up, and it gave me the ? folder. I booted to the install disk and it did not show up in the disk utility. I put my old hard drive in the USB case, booted to the install disk, and it showed that it was there, but unmounted and it could not repair the file system.
I repartitioned my hard drive (i have time machine working..not a huge setback) in the USB case and put it back in the computer. It still would not show up in disk utility. I put it back in the USB case, installed OSX onto it (in about 20min), restarted a couple times, saw that it was working, put it into my computer, and got the ? folder again.
I went out and bought a stardard 160GB SATA 5400rpm Seagate drive to try in there, and this fresh drive is not recognized inside the computer either when I boot into disk utility.
The brand new hard drive WILL show up in Disk Utility when I boot to it from the install disk, but it will not survive a complete installation.
So now I'm running OSX from my original hard drive in a USB case until I can figure out why the old disk recognized inside my laptop is the new hard drive upgrade, but it cannot complete an installation on it.
I'm originally a Windows slave, so I can only think in terms of AHCI or SATA-card drivers, or screwed up bios. But this is all pre-os-boot, and the apple firmware seems to be pretty automatic in picking the right settings to see stuff.

I kind of feel like drawing a flowchart to show all that I've tried. Its difficult to keep everything intelligible while listing the entire last week's efforts at 2:45am. :-/
http://www.ocztechnologyforum.com/forum/showthread.php?t=41951
I also explained it here, perhaps a bit differently. Maybe some reply there might spark someone's memory of a possible problem. I understand the nature of computers (been 100% geek for 20 years), but I'm hoping there's someone out there with the specific Apple expertise to help me out. Eventually the processes I've taken and my specific situation will become clearer as the questions widdle away at this.
My original 7200rpm SATA drive that works fine won't show up when connected to the SATA cable. I've repartitioned it with HFS, and repartitioned it as free space in the USB enclosure. It simply won't show up in Disk Util. Same with the brand new test SATA drive.
The new SSD SATAII does show up, but after a 4hr install the partition is unmounted and won't show up as a boot option. I can boot to the install disk and repartition it, reinstall, or remount it. But it will never be mounted to be booted from while connected to the computer. I've had 2 of the SSD's to try, one survived one restart, then went into a never-ending restart cycle after I installed the updates. The 2nd has never successfully been mounted after the install to boot from. Now nothing can be mounted to boot from within the computer. I have to boot off of any of these drives from the USB enclosure.
If I install OSX on them while in the USB enclosure, that works, but they will not mount when connected to the SATA cable inside the lappy. The platter style SATA drives won't even be recognized...
Thanks for the instant reply, this is driving me nuts 'cuz it makes almost no sense. Thanks so much to everyone that contributes. I appreciate everything.

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?

How do I access an external hard drive that shows up in Disk Utility but will not show up in finder or on my desktop?

I have an external hard drive that just stopped showing up one day. Is there a solution to this problem that allows me to secure the data on the drive before reformatting?

I'm having the same problem bpay14, but with a CalDigit VR2 6TB RAID0 external hard drive.
One day it was showing on my desktop, the other it wasn't. And I still didn't update my Mavericks to 10.9.3 (still with the 10.9.2).
It shows up in the disk utility, and I can even Verify the disk and Repair it (but I don't wanna start repairing
something that probably doesn't need to be repaired, so I haven't clicked the Repaid button, only the Verify button) and it says its working just fine.
But it doesn't show in the Finder or the desktop for that matter.
And even if I force disconnect the cable, I get the usual "this disk was not ejected properly" notification
presumingly the disk was mounted on the desktop and I forced eject by unppluging it...
I found a way to force open the disk, through Disk Utility that's by clicking with the right mouse button
on the disk icon, and chosing OPEN "CalDigit AFRICA 6TB"... (see picture 1)
But... after that, it open a Finder window showing all my internal and external drives, but that drive's
name is in washed grey, like if it was unmounted (see picture 2).
When selected, I can see everything and work normally on the harddrive, even opening FCPROX projects or Libraries, copying from it and writing documents into it... just normal... (see picture 3)
BUT IT DOES NOT SHOW IN THE DESKTOP...
that's my problem...
I even did a Command+i for Info on the hard drive. (see picture 4)
Can anyone shed some light on this issue?
I would be eternally grateful!
Thanks in advance!!!
Cheers!

My external hard drive doesn't appear in disk utility

I've been using a western digital my book (500gb) external hard drive connected to my Airport Extreme for TIme Machine Backups. For no apparent reason, it stopped backing up a few days ago. I've plugged the drive directly into my MBP, and it doesn't appear in system profiler or disk utility. Any ideas how to get the MBP to mount the drive?

matthewfromlincoln wrote:
I've been using a western digital my book (500gb) external hard drive connected to my Airport Extreme for TIme Machine Backups.
I hate to have to tell you this, but backing-up that way is unreliable, and not supported by Apple. See Using Time Machine with an Airport Extreme Air Disk.
But, as ds store says, the disk is likely dead.

Windows based WD external hard drive not showing up in Disk Utility to reformat to Mac... how can I erase the drive

We have a WD external harddrive previously used with a PC that we want to completely erase and reformat for use with our iMac desktop for use with Time Machine. The drive shows up on the desktop of the Mac, but it does not show up in Disk Utlity, assuming because it's Windows format. Outside of the standard "erase" feature in Disk Utility, is there any way to reformat this drive for Mac OS X? Or how can I get this drive to show up in Disk Utility? Note: The drive functions properly, has power, and we are able to view its current contents through the desktop icon, so it is a working drive. And we are ok with losing all the current data on the drive.

Hmm strange, I had just moved my external Lacie drive from my windows machine to my iMac and it was showing up in disk utility still formatted fat32 or whatever. I would disconnect the drive and restart the machine then replug the drive and try again.
Also not that it will make a difference ( I dont think it will but hey why not ) try accessing disk utility from the install disk?

External hard drive not recognised after using disk utility to format

i formatted two external hard drives using disk utility on my mac mini, now they do not show in finder. they can be seen in disk utility but the repair options etc are greyed out?

Try http://pondini.org/OSX/DU1.html
Allan

My external hard drive accidentally switched off during Disk Utility's "erase free space" process. I restarted the external hard drive and Disk Utility, but now I get the "couldn't mount disk" error when trying to finish the erase. Please help!

My external Lacie Quadra hard drive accidentally switched off in the middle of "erase free space", and when I switched it back on Disk Utility was hanging. So I Force Quit Disk Utility and restarted it. Now when I try to erase I get
"Secure Disk Erase failed with the error: Couldn’t unmount disk."
But "erase free space" seems to work...
What can I do? I'm erasing as I'm giving the drive to someone else and I wanted to wipe it clean.
Also should I use "erase" or "erase free space" if I want to wipe the drive clean?
Please help!

Sorry I don't really understand.... there are no partitions on the drive. How do I repartition it?
And should I use "erasing free space" or "erase" for wiping clean my drive of everything? Erase seems to be faster last tiem I tried.
Thanks!

External Hard Drive not working thanks to disk utility format MS Dos?

hello everyone, i have a problem and i have no idea what to do, heres the deal.
a friend of mine bought a toshiba external 320gb hard drive, i have 100gb of video footage he needed, i opened the hard drive, used it without a problem, he took it home and he couldnt use it on his PC so i did some research and found out that to use it on a PC and MAC i had to format it using disk utility to MS dos, so i did that, after that both my macs dont recognize the HD and if i try a PC, it appears but you cant do anything with it, if i try to format it it says to insert a disk in that drive....
is there anyway i can fix this? or do i owe my friend a 320gb external HD?
thanks

Mac format is different than windows format. Fat32 is recognized by both systems, but has its limitations. You just need to reformat the drive to NTFS on a PC. I believe HFS+ was probably what your original drive was. If it was Fat32, it would have been recognized on the PC.
For future reference, just install the NTFS driver on your mac. You can find it here http://www.macupdate.com/app/mac/24481/ntfs-3g. Reformat the drive on a PC, install the driver and you can read and write to Windows NTFS drives and never have to worry about it again. Just right click on it in Windows and format it to NTFS.
Hope that helps.

External hard drive not showing up in Disk Utility

I'm attempting to transfer something from my Mac to my Windows with a Toshiba 1 TB USB external drive. When I plug it in, however, it doesn't show up in Disk Utility, Finder, or the Desktop

No I don't, I was using it less than a half an hour before then I plugged it in, and it wasn't popping up again.

External Hard Drive not mounting. In Disk Utility, the partition in the drive is greyed out.

So my Seagate 500GB drive, didn't mount the other day, and I investigated a bit and tried repairing the disk and this happened... please someone give me hope! Ihad so many important and irreplaceable videos and documents on this drive!!!

Anyone? Please?

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

In disk utility, it shows that my external hard drive is somehow unmounted and I can't access it in finder or repair it in Disk Utility. How can I get this working without losing my important data?

In disk utility, it shows that my external hard drive is somehow unmounted and I can't access it in finder or repair it in Disk Utility. How can I get this working without losing my important data?
Thank you!

When you erased the disk did you select Mac OS Extended Journaled as the format option?

External hard drive won't unmount for disk utility.

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