Lots of extra partitions, and unable to unmount main disk

So I'm trying to reinstall OS X. I follow the usual instructions by booting into recovery mode with Cmd+R. I attempt to erase the hard drive with the Disk Utility, but it fails to unmount the Macintosh HD partition. "Couldn't unmount disk."
So then I exit disk utility and fire up terminal to execute diskutil list only to find that there are 15 disks. I recognize the first 3 (main partition, recovery partition, and the dvd drive), but I have no idea what the other 12 disks are (they are all of various sizes with the largest being about 5 megs).
So my question is twofold:
How do I clear my main partition so I can reinstall Yosemite (ignoring the error and trying to start the internet reinstall fails on the same unmount error)?
What are all these other partitions and are they safe to remove?

If you have actually booted from the SL install DVD, your HD partition should mount & unmount as necessary with no problems unless there is some hardware problem with the HD or a related hardware item.
First, make sure you are booted from the DVD -- no Finder or user login, Disk Utility available from a "Utilities" item in the main menu bar, etc. Then in Disk Utility make sure you are selecting the correct partition for the erase (or the whole HD if you are reformatting it from the "Partitions" tab).

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Unplugged my imac by accident and unable to unmount volume for repair

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I have an IMac 25" 3 years old-on Maverick
Thanks

If the computer will not see the internal HD when you start in the Recovery volume then it may be damaged. Time to take it to an Apple Store or AASP tone looked at.
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Hi:
Click on the link below and then click on the link labeled Order Recovery Media.
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I can't expand my partition and I have free space Macbook pro mid 2010

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Hi LamboMong,
just try this:
http://refit.sourceforge.net
install, reboot twice and choose the Windows-Partition on next startup.
(The apple-bootloader doesn't display all bootable harddisks.
With rEFIt you can boot from all partitions/harddisks on your computer.)
I hope that will solve your problem.
Daniel Fernau

I am unable to install Lion. I have a Core 2 Duo iMac with 4GB of Ram and 120GB of free space - and no Bootcamp or other partitions - and yet repeatedly get the 'no recovery' error. Can anyone help?

I am unable to install Lion. I have a Core 2 Duo iMac with 4GB of Ram and 120GB of free space - and no Bootcamp or other partitions - and yet repeatedly get the 'no recovery' error. Can anyone help?

Run Disk Utility located in /Applications/Utilities before trying to upgrade to Lion in case the startup disk needs repairing.
Using Disk Utility to verify or repair disks

911... Unable to unmount disk! My external drive is 499G, the available space is 73G and it's empty!

Hello dear support community,
It all started when few weeks ago I plugged my external drive and nothing from the data would open. Then I got mad and never used it again. Now few days ago, when I plugged it into my Mac OS X Yosemite 10.10 it just went crazy! The full capacity is 499G. I go to "get info" and the available capacity is 73 and the external drive is empty. I have movies and videos of the capacity of 425G. Where did all that information go? I am sure I did not delete any of its content. I even copied the disk on my desktop but I can't open it either. It tell me: "you don't have the permission to see its content" And Also why when I go to "disk utility" to erase or repair the external disk, it shows me "unable to unmount disk" I would like to know what I shall do please! The Files are empty and I want to be able to recover my data and use the disk like I used to. Oh by the way, when I clicked in verify, it told me: "disk needs to be repaired" and that didn't work either.
Thank you for kindly help!
Regards!

Restart. That should free whatever it's showing as an open file.

I have recently downloaded Bootcamp onto my MBP. However, when i try to expand it from "downloads" it says "Unable to expand BootCamp5.0.5033 into downloads. Error 2-no such file or directory. I have tried changing the partition and Zipeg. didnt work

I have recently downloaded Bootcamp onto my MBP. However, when i try to expand it from "downloads" it says "Unable to expand BootCamp5.0.5033 into downloads. Error 2-no such file or directory. I have tried changing the partition and Zipeg. didnt work.

You need to read and follow the Boot Camp instructions. Boot Camp Assistant is already on your computer in the utilities forderf. You run Boot Camp Assistant. Part of the process is to to then download the Windows Support software. This download is then installed from within Windows.
There is no Boot Camp download that needs to be installed or unzipped from within OSx which you seem to be doing.

Failure erasing and restore partition on PB, "cannot unmount disk"

Hi,
I would like to erase a partition that I have on my 30gb internal harddrive.
I get an error message saying something like "cant eject/unmount the disk" same error message when I run the diskrepair.
when I did the restore thing ( disk image of installdisk OSX 10.4) (I skipped the erasing and whent straight for restore) I got another error message. (saying something something and (-10000))
What can I do to erase the partition and restore

Calle:
I would like to erase a partition that I have on my 30gb internal harddrive.
Do you have more than one partition on the HDD? I suspect you have only one since the HDD is only 30 GB.
Your computer is now 8 years old, as is the original HDD. The average life of these drives is 3 to 5 years, so your HDD is well past old age. You may be getting the error messages because your drive is failing.
cornelius

How I tried fix my partitions and restore a Dell Diagnostic Partition.

UPDATED: 2 September 2012
UPDATE: Now that I reflect back on the incidence, I realize that the Dell Utility partition had lost its ability to boot long before I had messed up my partition table. But I realized it only when I was testing all my partitions after fixing the partition table. But as I have already written this long post, lets just keep it here for future reference of anyone else stumbling across a similar problem. Read on to know about my experience.
RECOMMENDATION: I do not recommend trying out all the steps below as they did not completely solve the problem for me. If you need the Diagnostic Utility, download the update package from Dell's support website for your model. This package can be used to create a boot-able USB drive and/or CD/DVD. These work fine and are pretty fast also.
Something strange happened to me and I am now reporting my experience in trying to solve it (somewhat unsuccessfully!!)
First of all, my setup is: Dell Studio 1555 laptop. I dual boot Windows 7 and Archlinux. So here's how it went:
After using the partitioning tool Gparted under Archlinux to resize a partition, I found a problem had occurred. The Partition was NTFS formatted and all of my data files were stored on it. The partition worked fine under Archlinux as I was able to access my files fine under it. But in Windows, although the partition was listed under Windows explorer, it wanted to format it!! When I tried to access the partition it gave an error that it was not formatted (
The drive is not formatted, do you want to format it now?
). Of course, that was not right and Gparted had messed something up. I fixed that using Testdisk under Archlinux (See the Details). So now the partition problem under windows was fixed. But now another problem cropped up under Archlinux. When I booted into Archlinux and started Gparted to confirm everything was fine I saw something strange in Gparted. The whole space on my hard disk was marked as "unallocated" under Gparted. Windows and Archlinux could "see" the partitions. By this I mean that I was able to boot fine under both my OSes. And I could access all my files under all my partitions. But somehow Gparted was not able to "see" them. Gparted was reporting my whole disk to be marked as unallocated. After that I researched a lot and lots of stuff happened experimenting to fix the problem. I used a lot of utilities. But actually only one fixed the problem-fixparts from the gptfdisk package. But it seemed like a lot of work trying to get the problem fixed (See the Details).
Now we get to the point in discussion. I was able to get my partitions back under Gparted. But I lost the Dell Diagnostics Utility partition's ability to boot up. [Actually, now that I reflect back on the incidence, I realize that the Dell Utility partition had lost its ability to boot long before I had messed up my partition table. But I realized it only when I was testing all my partition after fixing the partition table. But more on this later.] It gave an error that the partition was not found.
So, in short: After all this restoring partitions' visibility under Gparted, I realized that the Dell Utility partition on my Studio 1555 was not booting up. To explain this, it means that when I press F-12 when starting the laptop and select Diagnostics from the menu to run the Diagnostic Utility and after running the Pre-boot System Assesment tests when I consented to boot the Diagnostic Utility partition, it gave me the error that the partition was not found. When I tried to run the "Dell 32 Bit Diagnostics (Graphical User Interface version)" update package under Windows, it resulted in a similar error: Partition not found.
For some background on what makes the Dell Utility partition so special, please read this thread and the third post on this thread.
WARNING: You and only you are responsible for your data. Please make a backup before performing any of the partitioning steps below.
NOTE: Please read the entire post before actually performing the steps.
So, to try and fix this I did the following:
Boot into Windows 7.
Open Disk Management under the Computer Management console (To open the Computer Management console, right click on Computer in the Start menu and select Manage).
Reformat the Dell Diagnostic Utility partition as FAT(not FAT32). This is the first partition on the drive (marked as Healthy (OEM Partition) under the Status column). [This step may not be required, however I had done it. See Notes below.]
UPDATE: After reading around a bit I found that these steps to format the partition might not actually be necessary. Simply changing the type of the partition (as detailed below) might also work. However as I had done that, lets just keep these steps over here.
Reboot into a Linux distribution Live CD (I had Ubuntu 10.10). Or, If you dual boot with a Linux distribution that does not complain about the now inconsistent fstab entry, you can also boot into that distribution directly. I had to boot into Live CD to fix my /etc/fstab.
UPDATE: After considering all the aspects from start to end I have come to a conclusion regarding the efficacy of this method on dual boot machines with Windows and Linux installed. I doubt anyone with a dual boot Windows/Linux setup would be able to boot into the Dell Diagnostic Utility even with the Utility Partition restored. This is detailed below.
(As noted above my Archlinux install did not boot up after I had reformatted my Dell Diagnostic Utility partition. This is because I was mounting the Dell Utility partition at boot using fstab inside Archlinux. And I was using the UUID to mount the partition. After reformatting the partition its UUID changed. So, it wouldn't mount. And because of how my fstab was setup Archlinux won't boot. So, I had to boot into a live environment to fix this. This step applied only to me. YRMV.) Fix the fstab entry.
(This step also applied to me.) Boot into the repaired Linux Distribution.
And open a Terminal.
In the open terminal run fdisk on your drive, e.g.,
fdisk /dev/sda
This is how it looks:
[abhishek@Nitaichand ~]$ sudo fdisk /dev/sda
Password:
Command (m for help):
To change the partition type give the appropriate command, i.e.,
Command (m for help): t
Specify the partition, i.e.,
Partition number (1-10): 1
Type L to see available codes:
Hex code (type L to list codes):L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Type the desired code, i.e.,
Hex code (type L to list codes): de
Write the partition table with:
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[abhishek@Nitaichand ~]$
Download the required Diagnostics Update Package from the Drivers Download page for your model. Got mine from here.
Run the downloaded package under the OS you it downloaded for. That is, run the .exe on Windows. Or, if you downloaded the .bin file for Linux then first make it executable:
chmod u+x CL1367A0.bin
And now run it under a Linux distribution with an older version of python installed (I think <2.7). I say this because the .bin package didn't run on an updated Archlinux for me, probably because it has the latest python. I ran it from the Ubuntu 10.10 Live CD and it ran fine under that.
On Windows, If you are not automatically prompted with an option to update your Utility Partition then you need to browse to the location where the package was extracted (for me it was C:\dell\drivers\R239866).
Now you need to manually run the extracted file (for me it was DDDP.exe). Most probably you'll need to right-click it and run it as an Administrator. And if all went well, it will extract/update the diagnostic utilities to/on the Dell Utility Partition.
I believe the above steps should be sufficient for someone who's lucky and who's update package is smart enough. However these steps were not sufficient for me. My "Partition not found" error was gone because I had changed the partition type. And so the update package was able to recognize the partition and extract the necessary files to it. But I was still not able to boot the utility partition. After the Pre-boot System Assessment although I no longer got the "Partition not found" error, but I was just dropped onto the GRUB boot menu prompt.
[UPDATE: As stated above, I realize that the recovery partition had lost its ability to boot long before I had messed up my partition table. But I realized it only when I was testing all my partition after fixing the partition table. Please refer to this forum thread for further Details. I do not think that it is possible longer to boot from the Dell Utility Parttion on my setup which has GRUB installed to the MBR. But the rest of the post documents my attempts to slove the problem without the knowledge from the forum post.]
Anyways, it was a pain to again and again set up/update the partition and test it after waiting half an hour or so for the Pre-boot System Assessment to complete. But I was determined to solve the problem at-least partially, until next time. So I created a GRUB entry to boot the Utility partition. Assuming the partition is the first partition on the drive (which is the case here), the grub entry is simply:
title Dell Utility
rootnoverify (hd0,0)
chainloader +1
I tried downloading an older update package. I updated my Partition with it. And tested. Still, I was unsuccessful. I researched a little bit and found this link. Out of frustration,I decided to use brute force this time . So, the below are the steps which let me have at-least a glimpse of The Dell Diagnostic Utility booting up from the partition:
Backup your partition table using the sfdisk command (not fdisk).
Follow the instructions in the link I gave above (i.e., http://community.spiceworks.com/how_to/show/1123) and build your Utility Partition from scratch.
Now after that when you try to boot into the OS you'll be presented with an blue bar on top. This is because the mkup batch file from the Dell Diagnostic/Drivers CD/DVD wiped your partition table and rewrote it with only one partition on it- the Dell utility partition.
Boot into a Live environment and restore your partition table from the backup created earlier using sfdisk.
Now boot with a Windows disc to repair your Windows boot problem. This applied to me but may not apply to you.
Again boot into a live environment and restore GRUB to MBR.
After a reboot press F-12 to get to the BIOS boot menu and select Diagnostics.
Let the Pre-boot Assessment run and after its complete it will ask you to press any key to boot the Dell Utility partition. Do that.
You'll notice your still dropped into GRUB instead of getting the Diagnostics GUI.
Now when on GRUB prompt don't boot any other OS.
Press any key (other than <Enter>, that is ) to stop the timer if you have one set.
Now look carefully at the boot menu.
Remember I told you that I had created a GRUB menu entry to boot the Dell Utility partition. Select that. And if you are lucky you might just be able boot the partition. This worked for me (finally!).
After this initial run I was unable to run the Diagnostics GUI from the GRUB menu entry again. I haven't tried to re-run the Pre-boot Assessment and wait to see, if I'm able to boot it from there. But now, I'm satisfied that at-least the file there are in a running condition.
Also, the update package can be used to create boot-able USB drives or boot-able CD/DVDs which can run the Diagnostics just fine. They are almost as fast as the partition (especially the USB which seems even faster). They are recommend, instead of going into this trouble to recreate the partition. That is unless you are a purist/perfectionist .
Notes:
At first, I panicked and tried a lot of steps that are not exactly documented above for the sake of convenience to others who might refer.
I have thus rewritten the post in a manner to make it very general in nature as it did not become very fruitful for myself. If you attempt to use this guide, use common sense where necessary .
Of course, if you are trying to build a Utility partition on a bare hard drive or you're feeling adventurous, you can always follow this link .
Last edited by bhadotia (2012-10-08 19:03:18)

bhadotia wrote:Anyway's the file downloaded from dell to update the partition for Studio 1555 is corrupted (checksums don't match). My partition still doesn't boot. I'm working to fix this and will update my post when I'm done.
The file seems to create the CD/DVD/Image and USB just fine. So I used this only to create a CD image which I then wrote on a blank CD which seems to work fine. Also, I played around a bit and had some partial success in booting the partition. I've updated my original opening post with the new findings.
Whew!! what a waste of time! Never want to do all of this again .
Last edited by bhadotia (2012-03-03 00:05:22)

Best way to migrate existing XP SP3 partition to a virtual machine to run via Windows 8.1 as physical partition and not a vhd?

Hi I have a current XP SP3 setup have been using in a dual boot with Windows 8.1(on separate partitions on different hard drives - I think these are SATA drives) but now am thinking of migrating my XP partition preferably as a live virtual machine
to be run as a guest via Windows 8.1 as host so I don't have to do the rebooting. Also prefer this to making a VHD of my XP so can use the existing partition allocated for it rather than taking up extra space as VHD on my windows 8 (and don't want yet
to replace my xp dual boot in case it does not work so well as vhd, as I have a lot of old educational programs my kids still use on it that I don't really want to put onto my W8.1). Will also save time if I don't have to convert it to VHD first. I
also do not want to reinstall a new XP Sp3 virtual machine from scratch for same reason - will take too long to resetup -just use existing as is.
I have used VMWare player and Virtual Box in past with an old 98SE system as a virtual VHD/VPC file but VMWare workstation is paid which may be the one I need to use a physical partition but I prefer to try freeware options first.
Will Hyper-V in Windows 8.1 (I have retail PRO version of both my XP and Windows 8.1) be able to do the same as VMWare workstation? OR is there another option to run the physical XP?
The other thing with my XP setup is that the user profiles that people login with are located on a different partition E (80GB) to my XP which is on J (100GB) and most of the programs for it run from partition D (over 120GB) and the XP boot loader resides
on a partition C (2GB) (which is not the Windows8.1 partition which becomes C only when it boots, but this C drive for XP may also be having the Windows 8 boot loader and files for that -using EasyBCD to handle boot menu of W7 type boot loader).
So I need a system that can mount these other physical partitions also alongside with my XP partition when it boots up.
So what are my options for running this XP SP3 setup via Windows 8 as a guest operating system?
Also will doing this be likely to require reactivation of my existing windows XP (retail) which means I cannot then use it again if I go back to the XP dual boot at times or in case the VM setup does not work?
Also do I need to change my XP first so that it boots off its own drive rather than the C partition - and how do I set this up then using EasyBCD or windows boot repair?

HI I found I had to make physical disk offline to use in Hyper-V which I cannot do and do not want to do with all partitions - cannot choose just ones want.
So now am trying to make VM of my physical XP -and other partitions neeeded but D partition is over 127Gb so cannot use Disk2VHD.
Here is what am trying now - any other suggestions for alternate software to vmware convertor/disk2VHD maybe to do partitions over 127GB? I have posted also at VMware forums but no answer as yet.
Advice on doing a physical XPSP3 conversion to a VM for Virtual box and hyper-v ultimately
Hi I need advice as to best way to convert an existing XP Sp3 install on a physical hard drive along with other related partitions to a Virtual box VM image with aim to convert that VM image to a Hyper-V VM for use with Windows 8.1 host.
I have several C (boot ini partition), D programs, E Data, etc partitions and a current dual boot with an extra XP install I use as a backup system.
My main XP is on J drive and other XP on I drive with C drive boot ini that switches btw 2 with J set as default.
I have a D partition that is over 127 Gb so cannot use Disk2VHD which would have been easier, and it seems there is not a way to make a direct Hyper-V VM from converter but only Vmware VM?
I do not have or want to purchase as yet VMware Workstation as have W8.1 Pro that can use Hyper-V to run my XP SP3.
I seem to also have an issue with COM+ corrupted on my machine XP J drive ( It tried to reinstall the COM+ but my es.dll file won't register and I did get a failed conversion with converter when tried earlier at 94% saying VSS snapshots have
reached their limit). I think this is related to my COM+ issue which I am not sure now how to fix apart from repair install of my Xp (as I have tried repairing COM with various articles searched on google to no avail) which I may do first before
retry conversion. However my ALT XP on I drive seems to be fine with being able to browse the COM+ applications ok. SO maybe I can use that instead but it is the J drive XP I want the most (not sure if will work at reboot if I do not
hot clone it?)
I have read also the manual for converter 5.5.1 ver standalone and am not sure of a few things so if someone can guide me it would be very much appreciated.
First of all which version VM should I make image of if I later want to convert it to a Hyper-V VM image (I only have free Virtual Box latest ver, VMware Player and Hyper-V on Windows 8.1 PRo) ie: VMware workstation 10 or Vmware Player 6 or lower
ver or other? OR is there another software I should install for the conversion or later conversion to Hyper-V? I prefer to use Hyper-V over Virtual Box and Vmware Player if possible, but should these others work just as well for my Xp Sp3 existing
system as a VM in Windows 8.1? Please advise which you think is best of these?
Should I leave all configuration options off while converting and even XP licence, workgroup etc or is it most likely that I will have to reactivate my XP (retail ver) once I reboot in the VM although I am putting to run on Windows 8.1 host on exact same
hardware as my current XP in dual boot (replacing my physical copies which I don't intend to use after conversion)? Can I enter licence etc later as well?
I currently have 8 GB ram total -should I leave Xp one at max it suggests of around 3Gb ram?
I have Quad core processor -but should I make Xp Vm one dual core for when it runs on W8.1 host to allow the host some processors so can run at same time or leaving my Xp at quad core will be ok?
Network - I want to use host one as I read it is safer for obsolete XP so do I set that at start or is it better to change this later too -allowing xp to have own internet access (maybe as may need to reactivate also - don't want to call Microsoft
if can avoid it)?
If I just want to convert resulting VM to Hyper-V VM -which software to use after for this that is freeware (Virtual Box or VMware Player or Hyper-V -not sure which can do it) and do I not then install Vmware tools?
SYSPprep should I do anyway regardless of what target VM will be when configuring later, even if on same hardware machine? OR can I just boot Vm and see if boots ok first?
Anything else I should set specifically for this future use of the VM image in hyper-v?
AU

Running Leopard on one partition and Tiger on another partition?

I have recently purchased a family pack of Leopard, and I am reading up on a lot of the posts, here, before I venture the installation on two machines. I intend to install Leopard one machine at a time and give a few weeks between installations.
One machine is a 20" 2.0 Ghz Intel - IMAC Aluminum (August 2007), and the other is a G4 Powerbook 17" 1.67ghz 250GB HD. I will probably install on the IMAC first.
My question concerns the G4 Powerbook 17." I have just purchased a 250gb internal hard drive; however, it has not arrived yet. From time to time, I want to be able to run a few programs in classic....., and to have that available to me in the rare event that I want to look at files formatted for classic programs. Call me old fashion or unable to let go of the past... .in any event, I have some files that may be difficult to convert or some software that I do not want to purchase in OS X because I use those programs so rarely.
Initially, I considered just having an external fire wire drive with Tiger installed on it in which I could boot classic up on the rare occasion.
My new idea has been to partition the internal drive to have 10 gb or so available for Tiger. Has anyone successfully run Leopard on one partition and Tiger on the other partition or do they potentially cause problems for one another? Any suggestions, recommendations or concerns are welcomed.

Works like a champ. I run Panther, Tiger, Leopard, and OS 9 on the G4 w/o problems.
Get a bootable, external HD, partition it into enough volumes to accommodate each machine, and make bootable backups/clones of each machine before upgrading/updating and ensure that each boots that machine and works like the original. That allows you to revert to the previous good state without having to reinstall anything. See these for details:
http://docs.info.apple.com/article.html?artnum=106941
http://www.macmaps.com/upgradefaq.html
http://www.macmaps.com/backup.html
http://www.thexlab.com/faqs/installswupdates.html
http://www.thexlab.com/faqs/backuprecovery.html
Once that's finished, review these for upgrading options:
http://discussions.apple.com/thread.jspa?messageID=5757385
http://discussions.apple.com/thread.jspa?messageID=5666369
http://discussions.apple.com/thread.jspa?messageID=5646414

Unable to unmount volume for repair.

"Unable to unmount volume for repair."
It only does it to 2 of my 4 external disks.
Do I do something wrong ?
Thanx anyone.

You can't risk sawing off the tree limb you are standing on.
Your Mac will not Repair:
• The Boot drive
• A drive with Open files on it
the solution for drives with open files is to do a restart and do not re-open old Applications. The solution for the boot drive is to use Recovery_HD as the "place to stand" and run the version of Disk Utility from there. (this means you are no longer booted from the Mac OS X partition, and the regular boot Volume is then free for full repair.)
If the drive passes Verify, it does not need to be repaired.

Question: Unable to unmount disk to reformat My Book for Aperture export

Hello,
I upgraded to Aperture 3.01. I had never exported an Aperture library to an external hard drive before. Aperture 3 would not recognize the My Book Essentials (1 TB) for export. I cannot unmount the disk when trying to reformat from MS-DOS (FAT) to Mac OS Extended (Journaled). I went on the Western Digital website to download driver updates and that hasn't helped either.
Thanks,
Steve K

Same exact issue. Macbook Pro w/500SSD. Booting from the recovery partition, unable to modify partitions. No firmware password (if that mattered) etc. Had 2 partitions, now reformatting for single partition and error reads:
Partition failed
Partition failed with the error:
Couldn't unmount disk.
-pr

Help needed. I have a 3TB external hard drive partitioned into 1TB's. I used one partition as backup for the main computer hard drive. But now it is greyed out as shown in the disk utility and its name changed, i dont know how that happened, i tried verif

Help needed. I have a 3TB external hard drive partitioned into 1TB's. I used one partition as backup for the main computer hard drive. But now it is greyed out as shown in the disk utility and its name changed, i dont know how that happened, i tried verifying and repairing it but had no luck. I also tried mounting and unmounting it but still no solution. Anyone to help please?

Looks bad. I would strongly advise backing up the stuff on the other two partitions as soon as possible in case the rest of the drive goes wrong.
Beyond that, Disk Utility has limited abilities to repair disks, DiskWarrior uses a different approach and might, emphasis might be more successful. It has certainly done the job for me in the past when Disk Utility could not.
See http://www.alsoft.com/diskwarrior/

Lots of extra partitions, and unable to unmount main disk

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