Mac Fusion drive: The disk "Macintosh HD" could not be unmounted

Hi
I recently purchased a Mac Mini with the fusion drive. When I perform a verify and repair of the disk, I get the error "The disk Macintosh HD could not be unmounted". This does not occur with any of my other computers, imac or powermac (also running mountain lion). So I am wondering if I have a defective Fusion/HD or if this is simply a peculiarity of the fusion drive itself. Please comment.

If your Fusion drive can be repaired with Disk Utility, it will be shown with red lettering. If you are not seeing red lettering, then you need to boot into Recovery mode to use that Disk Utility. When you order a Fusion drive equipped Mac, there is a special version of Disk Utility included in OS X specifically for operation with Fusion Drives.
If you have any open files on the volume you wish to verify/repair, then Disk Utility will throw its hands up and give you that cannot unmount drive message. Make sure you have quit all applications you were using that may be accessing files on the disk in question.
Apple article.

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After getting the dreaded gray/blue screen, I tried to run disk repair on the internal disk. I got an error message saying "Disk Utility can't repair this disk and restore your backed-up files. The volume Macintosh HD could not be verified completely

After getting the dreaded gray/blue screen, I tried to run disk repair on the internal disk. I got an error message saying "Disk Utility can't repair this disk and restore your backed-up files. The volume Macintosh HD could not be verified completely." What do I do now? This is an iMac and I'm running 10.6.8.

Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it. See below for how to clone a drive.
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer. Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the "C" key. Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. After the installer loads select your language and click on the Continue
         button. When the menu bar appears select Disk Utility from the Utilities menu.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.) Click on the Partition tab in the DU main window. Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer. Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
         Assistant will complete the installation after which you will be running a fresh
         install of OS X. You can now begin the update process by opening Software
         Update and installing all recommended updates to bring your installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
You may be able to backup your data if you have an erased external drive you can use. Before you do the above but after you have opened Disk Utility you can try to clone your drive:
Clone using Restore Option of Disk Utility
1. Open Disk Utility.
2. Select the destination volume from the left side list.
3. Click on the Restore tab in the DU main window.
4. Select the destination volume from the left side list and drag
       it to the Destination entry field.
5. Select the source volume from the left side list and drag it to
      the Source entry field.
6. Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive.
Now this will only work if the drive is accessible and can be cloned by Disk Utility. Otherwise, you would need to access your drive from another Mac that you can connect via Firewire - Target Disk Mode.

External Hard Drive - "The disk you inserted was not readable"

Yesterday I bought a Seagate FreeAgent 500 GB external hard drive and I ran disk utility and had it erased and formatted for my iMac. Then I put all my video files and movies on there to free up some space on my main computer hard drive. The FreeAgent external hard drive showed up on my desktop right under the main hard drive and it was working fine.
Today I downloaded and installed Boot Camp and then installed Windows XP Home Edition. After I was done, I went back to OS X and now there's no icon for the FreeAgend external hard drive on my desktop and instead a windows pops up saying "Disk Insertion-- The disk you inserted was not readable by this computer" and my only options are "Disk Utility", "Eject", and "Ignore".
So I can't access my external hard drive now but I don't want to do the "erase" option on Disk Utility to reformat it since I have all my video files on there now.
I don't know what to do-- please help!!

Contact Seagate for tech support.

External Drive: The Disk You Inserted Was Not Readable By This Computer

I have a 2TB Western Digital external drive that I've been using for a year or two as my backup for my Aperture libraries. Been working fine until now, I get the "The disk you inserted was not readable by this computer." Clicking "Initialize" takes me to disk utility with no usable options. Whatdoido?!
Did my laptop just become illiterate?

I had this exact issue with my external harddrive, I scrolled forums and did what they said and nothing, then I just happened to be in the app store and thought I would search for data recovery, a few came up and only a couple had ratings so I looked at Data Rescue 3, its £40 so I went ot their website for the trial version, downloaded and installed that, tried it and rescued a random file (limits obvioulsy on the trial verison) and it worked so paid the £40 and am currently saving all my files to another external harddrive.
Try out the trial first and if it works on one file i reccomend the the full program!
Good Luck!

"Macintosh HD could not be repaired"... Do I need a new hard drive?

So my macbook pro when I turn it on goes straight to the apple screen like normal, then it just sits there and loads forever.
I then booted it with the Disk Utility and tried Verifying and Repairing the disk (I selected my hard drive). The repair couldn't be completed and it said that "The volume Macintosh HD could not be repaired." I tried it a couple times with the same result.
Then I booted in Safe Mode and ran the "fsck -fy" in which I got a series of errors in response. The following is what I got back:
"Invalid leaf record count
(It should be 283 instead of 287)
**Checking catalog file.
Invalid sibling link
(4, 26092)
**Rebuilding catalog B-tree.
**The volume Macintosh HD could not be repaired."
I did a little bit of research on similar problems and everything has said that the hard drive is crashed and that I will need a new one.
Suggestions said to clone the hard drive to hopefully not use the files but that ultimately I need to buy a new one from The Apple Store.
Does anyone have any input as to how I should go about fixing this, keeping the files, and maybe not having to buy a new hard drive? Or what do I need to do to go about having a running computer?

I don't believe that the evidence you have presented necessarily indicates a physical failue of the drive; neither does it disprove it. What we do know is that crucial data structures on the disk have been corrupted.
Ideally, you have a current backup of your data (could be via Time Machine, disk cloning software, and/or online backup; multiple backups would be even better). If so, try reformatting the drive (while booted from your recovery partition if your system is new enough or the disks that came with your older system), reinstalling the system, and restoring from the backup. That should suffice if there is no hardware problem and your backups were from before the corruption.
Let us know if that helps. If you need further assistance, please let us know the model and year of your MacBook Pro and the version of [Mac] OS X you have been running on it.

All music gone from iTunes and when trying to put it back, "Attempting to copy to the disk Macintosh HD failed. The disk could not be read or written to."

Hello,
I have a portable 500gb HD and I use it to put music and other stuff.
Earlier, out of the blue, all of my music from iTunes disappeared, and I tried to put it back by dragging my folder "music" from the external HD to iTunes, but the message "Attempting to copy to the disk Macintosh HD failed. The disk could not be read or written to." appears and nothing happens. Only 40 albums (the same ones every time) go into iTunes before the message appear.
I tried restarting the computer and nothing happened.

This sounds more like a hardware issue, possibly a failing drive if you had mysteriously vanishing files and there are problems writing to your drive.. You could get better support on a forum for your Mac model or at lest one for your operating system version. Have you verified the disk with Disk Utility to see what it reports?

Even after resets get "The backup disk image "/Volumes/FreeAgent GoFlex Drive/MacBeth (2) 1.sparsebundle" could not be created (error 22)."

HELP! "The backup disk image “/Volumes/FreeAgent GoFlex Drive/MacBeth (2) 1.sparsebundle” could not be created (error 22)."
TC estimates over 750GB for full backup.
Late 2010 MBA is connected wirelessly to
802.11n (1st gen) TC that is connected via ethernet hub built into house to motorola router using charter.com for internet.
I have had same problem for over 150 days and multiple reboots, restarts in proper order, firmware updates, unplugs with 5min plus gaps, bypassing the tc and using external 500gb WD mybook via usb to time capsule, replacement of the WD mybook to new 2TB Free Agent GoFlex drive, etc, etc, etc! Note: I originally named my MBA hard drive MacBeth, but at some point months ago, it said backup already existed and system automatically created MacBeth (2), worked for a while, then stopped again, despite trying nearly daily.
I gave up and started using Carbon Copy Clone daily for just the 128gb on internal SSD of my late 2011 11" MacBook Air, but need to get past these time capsule errors to back up the external disk! Due to lack of space in MBA, I had long ago transferred both itunes and iphoto and all imovie/fcpx files to a 1tb external disk (WD Passport) that I keep in my bag with MBA. It is partitioned with 150gb for cloning the MBA, and over 750gb for media/itunes/iphoto/etc.
Also, I have endured months of "your hard drive is full" messages and system lockups, applying the solution given to me by genious bar (deleting all aol.com outboxes/recovered messages/spam/trash under library/mail/V2/Mailboxes folders, empty trash, restart....watch recovered hard drive space mysteriously shrink next couple days to zero.....repeat)
Due to lack of space, I had not been able to do javascript and other system updates. Yesterday, I noticed even safari bookmark bar had mysteriously emptied (not disappeared, I can hide and show the space where the bar used to be - it is just blank area with no data except for eyelass-book-topsites icons), so I transferred a few large quicktime movie files recorded with isight camera to the external disk, and freed up 20 gbs for the first time!
This got my hopes up yesterday because after I completed all system/software updates, suddenly the bookmark bar showed up and I was able to start the time capsule backup! It took overnight preparing for backup, but finally started and progressed to 12gb of the 100gb+ needed (i guess the update where it left off months ago for the estimated 750gb for the full backup?), then I put system to sleep and took it with me (thus leaving the wireless time capsule network as I do daily fully expecting it to continue when I returned home in the evening.) But alas, upon return, back to the "Time Machine could not complete backup, The backup disk image ".....sparsebundle" could not be created (error 22)" Ugh! More reboots, unplugs, 5min gaps....still Ugh!
So the problem continues...please help! Here are my settings:
About this mac:
Mac OS X V. 10.7.5
processor 1.6 ghz intel core 2 duo, memory 4 4g 1067 MHz DDR3
software up to date!
Airport Utility:
V 6.2 (620.33)
both internet globe and TC show green dots in graphic, however internet occasionally shows yellow then goes to green, but still gets error 22. Suddenly TC showed explanation mark and says lost connection and asked if I wanted to 'forget', gave same errors, then mysteriously went back to green, but still got error 22!.
Internet:
connection: connected, displays router address, 2 dns server, and domain name: charter.com
Time Capsule:
shows network, ip address, serial number, version 7.6.3, status: (green dot) Setup over WAN,
wireless clients: phones, macbooks (including this MBA), printers, wii
If you need other settings to help me, just ask! I have read a few of the other solutions in forums, but trying not to erase disks, especially since it worked for a minute yesterday!

To step sideways.. why not just use CCC to backup the 750GB of the hard disk to the TC.
You need to understand this is going to be a super slow process and each time you stop it.. it is going to give issues. CCC will at least do a more reliable job of it than TM.
I would also say.. this is going to be tough without ethernet. You need to understand the backup speed over wireless can be 10GB per hour.. that makes 75hrs to backup the disk. The air needs to run non-stop doing that.. without you touching it.
I would get another external drive.. plug that into the MBA and if you really want to use TM.. make a backup one to the other.. but CCC will again do a better job and work faster. It will be much faster than over wireless.
I am trying to think of ways around the issue of just speed.. but plainly you have lots of other issues.. being the simple unreliablity of the TM to identify the TC.
If you want to make this work.. give yourself a weekend.
Load 5.6 utility into the MBA..
http://support.apple.com/kb/DL1482
Take the TC back to 7.5.2 firmware. It is a really old version and latest firmware does it no good at all.
Wipe its hard disk using erase and start over.. give it new names for everything.
So call it TC
Set the wireless to 5ghz and name it TC5ghz
Use WPA2 Personal security. Use a 10 character passkey non dictionary.
At 5ghz you should get 2x the speed as at 2.4ghz but the air will need to be right next to the TC..
(alternatively buy the USB to ethernet cord apple have available.. it is $30 in the apple store and do it over pseudoethernet. http://store.apple.com/au/product/MC704ZM/A/apple-usb-ethernet-adapter That is the wrong store but you get the idea. )
WIth a fully clean system.. now do a full reset of TM.
See A4 http://pondini.org/TM/Troubleshooting.html
Direct the TM to back to the TC.. and make sure the external hard disk is not excluded.
Of course the TC has to be 1TB version to fit that much data.. goes without saying right.
Even over pseudo - ethernet this will take many hours.. and you basically have to leave it to work.. do not touch it.. make sure the MBA cannot sleep though.. turn off sleep.. beforehand.

HT4718 No 1. I can not activate Filevault : FileVault can't be turned on for the disk "Macintosh HD". Some disk formats don't support the recovery partition required by encryption. To use encryption, reinstall this version of Mac OS X on a reformatted

I have TWO PROBLEMS
No 1. I can not activate FileVault. It displyas as follows :
FileVault can’t be turned on for the disk “Macintosh HD”.
Some disk formats don’t support the recovery partition required by encryption. To use encryption, reinstall this version of Mac OS X on a reformatted disk.
No 2. I can not activate Find My Mac service. It displays as follows :
Find My Mac requires a recovery partition
Some configurations, such as software or hardware RAID, do not support a recovery partition and can't be used with find my mac

Restart holding down the option/alt key and see if you have a Recovery Volume.
Recovery Partition – Recreate Without Reinstalling
Recovery Partition – Recreate Without Reinstalling (Requires Installer)
Recovery Drive – Restore Missing
Recovery Disk Assistant

The backup disk image"/Volumes/TimeMachine/Macintosh.sparsebundle" could not be created (error-2).

Time machine problem. Backups from my 1TB imac 2009, to a 6 TB RAID configured MyBook Live Duo (3TB+3TB) will not work over ethernet cable. I have 800GB on my 1TB internal drive, have tried the option, command p+r and it does not work. Still get two error messages.
the backup disk image"/Volumes/TimeMachine/Macintosh.sparsebundle" could not be accessed (error-1).
and
the backup disk image"/Volumes/TimeMachine/Macintosh.sparsebundle" could not be created (error-2).
Please help.

Welcome to the Apple Support Communities
See > http://pondini.org/TM/C17.html

I get the disk could not be unmounted after my external drive was unplugged while reading and writing to it. What now?

Running OSX 10.9.3 2.5 Ghz i5 16GB ram. No other known issuses. while importing some images from my external 1TB drive my son unplugged the USB cable. I got the error that a disk was not properly ejected and the program Lightroom 4 also gave an error. I closed both notifications and restarted my comp, no recognition of the drive, shut down the comp and unplugged the external. Still no recognition in finder, system information sees the drive, Disk Utility sees the drive but keeps giving me the error "disk could not be unmounted." what else can I try before I have to book an appointment??

Hey there Sirtuc,
It sounds like your external drive is not being recognized after a restart of your computer after the USB cord was unexpectedly disconnected. Restarting is the first thing I would have done as well, and next I would reset my SMC then my PRAM and re test the issue:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
Then:
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Thank you for using Apple Support Communities.
Take care,
Sterling

HT3546 I get an error when trying to back up on my TC. Message says - The backup disk image "/Volumes/Data/Macintosh.sparsebundle" could not be accessed (error -1).

I get an error when trying to back up on my TC. Message says - The backup disk image “/Volumes/Data/Macintosh.sparsebundle” could not be accessed (error -1).
Any suggestions

See here...
https://discussions.apple.com/message/20933934#20933934

Help! Some features of Mac OS X Mavericks are not supported for the disk "Macintosh HD"

I'm on a MacBook 13" mid 2010, OS X 10.7.5, I want to upgrade to OS X Mavericks. I have searched around for a few days, I find people with the same problem but can't really get the solution for it. I prefer not to reinstall OS X, I want to upgrade. I don't have boot camp or something just a 250 GB HD.
Well, while I'm trying to upgrade from the download from Apps Store, I open the installer, press continue then accepts the Terms.. then select Macintosh HD and click install, then an warning message shows up "Some features of Mac OS X Mavericks are not supported for the disk "Macintosh HD"
As I've read the article that is included in the waring message i did try to install anyway because it say that I would be fine, but when i did try to install the installer starts and after like 3 minutes a window appears, Install Failed.
I've even try to make a installer on USB, both with the command in terminal and with Diskmaker, but it does not help.
It seems impossible to upgrade. Please Help me.

First, see the heading "What to do if the installer warns that no Recovery System can be created" in this support article. If you use Boot Camp, back up and delete the Windows partition using Boot Camp Assistant. Try the installation again.

TS1600 OS X could not be installed on your computer. OSX can't be installed on the disk Macintosh HD because a recovery system can't be created.

I just bought the new OS X 10.8 and downloaded but when I tried to install it on my computer Installation Failed and I got this message:
"OS X can't be installed on the disk Macintosh HD , because a recovery system can't be created."
I tried so many times but the same message comes out to me each time and when I restart the computer I am back to the same OS X installer and can't access my computer any more so I am really stuck I can't install the new OS X version and can't go back to the old OS X version or access my computer.
Please help
My computer is MacBook Pro 13"

OK. You have a Boot Camp partition which is why the issue. See the following:
It seems the issue is that the space at the "bottom" of your available space when Lion installs it's partition is already occupied by BootCamp. The fix was to go into Disk Utility; Select your Hard Drive; Select Partition; Move the bottom of your main partition "up" a bit to create a space for Lion; close Disk Utility; Install Lion; once Lion is successfully installed, go back into Disk Partition and drag the bottom of your main partition back "down" to the bottom of the window.
In your case use Disk Utility to "shrink" your OS X partition a little more than 1 GB.
To resize the drive do the following:
1. Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
After the main menu appears select Disk Utility and click on the Continue button. Select the hard drive's main entry then click on the Partition tab in the DU main window.
2. You should see the graphical sizing window showing the existing partitions. A portion may appear as a blue rectangle representing the used space on a partition.
3. In the lower right corner of the sizing rectangle for each partition is a resizing gadget. Select it with the mouse and move the bottom of the rectangle upwards until you have reduced the existing partition enough to create the desired empty space. The space below the resized partition will appear gray. Click on the Apply button and wait until the process has completed.
Remember that you only need to shrink the OS X partition a little more than 1 GB. Now, when you try the Mountain Lion installation the installer will be able to make the Recovery HD.

The backup disk image "/Volumes/Data/Macintosh.sparsebundle" could not be accessed (error (null))

I keep getting "The backup disk image "/Volumes/Data/Macintosh.sparsebundle" could not be accessed (error (null)).
I have updated the firmware on the Time Capsule and unplugged and replugged it in after waiting more than 10 seconds.
I cannot access the sparsebundle to repair from the Disk Utility.
Does anyone have any other suggestions?

It sounds like you have already tried some of pondini's suggestions..
But C17 is the main one, even if the error is a different number..
http://pondini.org/TM/Troubleshooting.html
Mavericks in particular is having issues with the TC..
So I strongly recommend a full factory reset of the TC.
Make sure all names are short, no spaces and pure alphanumeric. See C9 for more info.
Because Mavericks now uses SMB by default for network protocol, it is worthwhile mounting the TC manually using AFP.
In finder use the top menu, Go, Connect to Server.
Type in as follows,
AFP://TCname
Replace TCname with your actual TC name..
If the computer fails to find the TC, try again using the full domain name.
AFP://TCname.local is the standard one. The TC opts for local although you now have no place to set it in the airport utility.
If you still have trouble tell me.
Once the computer locates the network resources, it will ask for a password, public by default. Type in your password if you changed it or public. And store it in the keychain.
Now reset TM.. see A4.
And point the TM to the TC again which you have mounted.
See if that helps.

The backup disk image "/Volumes/Data/Macintosh.sparsebundle" could not be accessed (error -1).

I ma getting an error message from my Time Capsule, "The backup disk image “/Volumes/Data/Macintosh.sparsebundle” could not be accessed (error -1)." The backup is not working. How do I fix this?

Just a reboot of the TC or whole network will fix most of the network issues which are unfortunately very common with Lion and worse with Mountain Lion.
Look at C17 for that particular error code here.
http://pondini.org/TM/Troubleshooting.html

Mac Fusion drive: The disk "Macintosh HD" could not be unmounted

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