Iphoto is placed in a disk image (sparsebundle)

Ever since I did this time capsule is backing up 18 GB a time. I have a sneaking suspicion that it can't differentiate the delta found in the image so it backs the whole .sparseimage file. Is this true?

Bingo! Same goes for vmWare Fusion, Parallels Desktop, and Entourage monolithic files. If you don't need to back those up, exclude them from TM backups and use another backup method.

Similar Messages

Time Machine Backup Error. Time machine could not delete the backup disk image .sparsebundle

Time Machine is giving an error message. Time Machine couldnt complete the backup. I am using the Seagate GoFlex Home. Error message states Time Machine could not delete the backup disk image "/volumes/Go Flex Home Backup/iMAc.sparsebundle". Does anybody have any ideas?

I have deleted all files in the Time Machine backup via Windows, Finder, and GoFlex UI.
I think this is your problem.. you need to follow the exact setup from seagate to get TM running again.. please read the manual... I do not have one but I do have another brand of NAS and setting up TM involves a fairly complex set of instructions.. because it is not a native Apple device.. your computer does not recognise it as TM capable.. you need to use the work around the manual will explain.

Image browsing very slow - iPhoto library on a shared disk image

Hello,
I'm experiencing serious slowness when browsing images with iPhoto. I get the spinning beach ball for several seconds every time go to next image. According to the activity monitor my CPU load is close to 100% when this happens. The problems started when I got a new camera and had to update to Photo 11 to get the RAW support. Also, I had to update to Mountain Lion to get iPhoto 11 running.
My library is on a shared disk image, and my wife and I are sharing the same library. I have increased the size of the image a couple of times as my library has grown. We have 17680 pictures in the library. Mostly RAW format.
I have tried flushing the iphoto cache and rebuilding the library. No effect. Then I created a new library (non-shared) and that seemed to work fine. The problem seems to be related to the disk image. I don't know what to do? Is there something I could try?
I'm running OS X 10.8.4 and iPhoto 9.4.3. There is about 100 GB free space on my boot drive. Here is my hardware Overview:
Model Name:    iMac
Model Identifier:    iMac9,1
Processor Name:    Intel Core 2 Duo
Processor Speed:    2,66 GHz
Number of Processors:    1
Total Number of Cores:    2
L2 Cache:    6 MB
Memory:    4 GB
Bus Speed:    1,07 GHz
Thanks,
Lasse

Using a disk image in the Shared folder has worked for few that it's not a method I would advise using in any situation. Get an external HD as TD has suggested. You'll be a lot more satisfied with the results if you do.
OT

HT3728 My Time Machine tells me it cannot complete the backup to my Time Capsule because the backup disk image sparsebundle is already in use.

The 2GB hard drive on my iMac failed and has just been replaced under warranty.
When I got it back I restored my Time Capsule and started back ups of the iMac and the MacBook Pro.
Now 2 days later it is telling me that Time Machine couldnt complete the back up to my Time Capsule as the backup disc image sparsebundle is already in use. It is saying this for both machines which presumably means a problem within the Time Capsule.
What does this mean and what should I do about it?

See # C12 in Time Machine --- Troubleshooting
http://pondini.org/TM/Troubleshooting.html

Time machine - "the backup disk image could not be mounted"

SInce a few days, I am unable to backup via Time Machine.
I always get the message:
TIME MACHINE ERROR
The backup disk image could not be mounted
I use an Apple Time Capsule and still have more than enough free space on it.
Use OS X 10.5.5
Help.....
Tks

Rosy,
*_"The Backup Disk Image Could Not Be Mounted" (Console - “Failed to mount disk image”)_*
First, it is important to distinguish this error message from another, similar Time Machine error that states “The backup volume could not be mounted”. This is important as the causes and cures for these two errors can be very different.
Consider each topic below separately. When one option does not resolve your issue, then move on the next one.
*Unmount the Backup Disk Image* (TC)
If, for some reason, you have manually mounted the Time Machine backup disk image (sparsebundle), or Time Machine failed to eject it after the previous backup, subsequent backups may fail. (Console - “Failed to mount disk image”… “Backup failed with error: 21”)
Eject the backup disk image (white drive icon) by either clicking the little Eject icon to the right of the disk image in the Finders’ Sidebar, or Ctrl-Click the drive icon on the desktop and select “Eject” from the contextual menu. Now try backing up again or launching Time Machine to view previous backups.
*“Disconnect All Users…”:*
If your Time Machine backup drive (“Backup of Users Computer”) is mounted on your desktop or in the Sidebar of the Finder window. then Time Machine may think the drive is already in use. Alternatively, if the Time Capsule hard disk has been recently accessed by a Windows machine, it may not have fully relinquished control. Do the following:
Open Airport Utility and select the Time Capsule on the left.
Click “Manual Setup”.
Select “Disks” at top of window.
Click “Disconnect All Users…” at bottom of window.
Close the Airport Utility.
Now try Backing up again.
“I got it resolved. Apparently it had to do with one of the files being open on the disk from the drive. I had browsed the disk with one of my windows boxes here and it must have left one of the folders "open". Anyway, I rebooted the TC and we are good to go now.”
*Proper Computer Name* #
Make sure your computer has a proper name. Go to System Preferences --> Sharing. Time Machine needs to differentiate your computer from others on your network (i.e. "Bills MacBook" or "Office iMac"). If the "Computer Name" field is blank, create a name. Realize that if this step is necessary, you will likely have to start the Time Machine backup process over again and do another full initial backup.
According to this article, [http://support.apple.com/kb/TS1760], Time Machine may experience problems if your computer name includes certain characters. Make sure the computer name only includes ASCII characters from the following set.
(0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ)
Once a change in the computer name occurs, you should stop and restart Sharing on the affected computer. Uncheck and then recheck Sharing in the Services list on the left.
Let us know if any of the suggestions above resolves your issue.
Cheers!

Time machine error: The backup disk image could not be mounted

Time Machine worked OK for several months. Now I get this error every 10 minutes or so.
I unplugged Time Machine capsule and "Change Disk" in Time Machine options.
Nothing helps, I continue to get this error.
I cannot Enter Time Machine either. "Connecting to Server, Connecting to backup" does not work.
Help please because I will probably have to archive and reinstall Leopard. I need the backups,
Christine

Christ1ne,
Before you reformat the disk, consider these causes of this error.
*_"The Backup Disk Image Could Not Be Mounted" (Console - “Failed to mount disk image”)_*
First, it is important to distinguish this error message from another, similar Time Machine error that states “The backup volume could not be mounted”. This is important as the causes and cures for these two errors can be very different.
Consider each topic below separately. When one option does not resolve your issue, then move on the next one.
*Unmount the Backup Disk Image* (TC)
If, for some reason, you have manually mounted the Time Machine backup disk image (sparsebundle), or Time Machine failed to eject it after the previous backup, subsequent backups may fail. (Console - “Failed to mount disk image”… “Backup failed with error: 21”)
Eject the backup disk image (white drive icon) by either clicking the little Eject icon to the right of the disk image in the Finders’ Sidebar, or Ctrl-Click the drive icon on the desktop and select “Eject” from the contextual menu. Now try backing up again or launching Time Machine to view previous backups.
*“Disconnect All Users…”:*
If your Time Machine backup drive (“Backup of Users Computer”) is mounted on your desktop or in the Sidebar of the Finder window. then Time Machine may think the drive is already in use. Alternatively, if the Time Capsule hard disk has been recently accessed by a Windows machine, it may not have fully relinquished control. Do the following:
Open Airport Utility and select the Time Capsule on the left.
Click “Manual Setup”.
Select “Disks” at top of window.
Click “Disconnect All Users…” at bottom of window.
Close the Airport Utility.
Now try Backing up again.
One poster reported: “I got it resolved. Apparently it had to do with one of the files being open on the disk from the drive. I had browsed the disk with one of my windows boxes here and it must have left one of the folders "open". Anyway, I rebooted the TC and we are good to go now.”
*Proper Computer Name* #
Make sure your computer has a proper name. Go to System Preferences --> Sharing. Time Machine needs to differentiate your computer from others on your network (i.e. "Bills MacBook" or "Office iMac"). If the "Computer Name" field is blank, create a name. Realize that if this step is necessary, you will likely have to start the Time Machine backup process over again and do another full initial backup.
According to this article, [http://support.apple.com/kb/TS1760], Time Machine may experience problems if your computer name includes certain characters. Make sure the computer name only includes ASCII characters from the following set.
(0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ)
Once a change in the computer name occurs, you should stop and restart Sharing on the affected computer. Uncheck and then recheck Sharing in the Services list on the left.
# Try removing the apostrophe from the disk images name (sparsebundle).
*A Stalled .inProgress Files:* #
It may be that the previous backup attempt was ungracefully interrupted leaving remains that Time Machine can’t deal with.
Stop any current backup attempt. Choose “Stop Backing Up” from the Time Machine menu.
Open the Time Machine Preferences and turn “OFF” Time Machine.
Open your Time Machine drive.
Open the folder labeled “Backups,backupdb”.
Now open the folder containing backups of the computer in question.
Are there any “.inProgress” files there. Delete them by dragging the file to the Trash. Or Ctrl-Click the file and select "Move to Trash" from the contextual menu. (Give this time as deleting a large file on an external disk can take a while.)
Turn Time Machine back “ON”. Now try backing up again.
NOTE: If the above procedure becomes impossible to perform, try accessing the disk image from another Mac. Some have discovered that attempting a repair from another computer succeeds where the original computer failed.
Let us know if any of the suggestions above helped to resolve your issue.
Cheers!

Why does screen saver prompt for secure disk image password?

Okay, seems like an odd problem, but here it goes.
I go into System Preferences->Dektop & Screen Saver. As the program "loads" availabe image sources and such I get a pop-up requesting a password to my secure disk image.
Yes, I have a secure disk image in my home directory.
Yes, the secure disk image is currently "locked" (Not mounted in finder).
I click cancel (a few times, probably 2 maybe 3 times) and things continue along fine.
I select a photo source that I want for a screen save and exit peferences.
I then go an start the screen saver (I'm using Hot-Corners).
I get the message "Looking for pictures....." for , well...basically forever...
Sure enough I touch the mouse to leave my screen saver and there is the pop-up again. Asking for me to unlock my secure
disk image.
I thought this might be related to Spotlight. I tried reading several threads and have gone as far as taking my entire hard-drive/volume
and putting it into the "Privacy" tab under spotlight.
Anybody have any idea on what is going on and how I might get it so the "Desktop & Screen Saver" stop prompting me to unlock my
secure disk image? (WITHOUT having to make sure the disk image is unlocked before I sleep my screen or open the screen saver utlity)
As always, I am only speculating that this is Spotlight related so that could be a red-herring....
thanks in advance.
OSX:10.7.3
imac/3.1G/Intel

Update: i made some progress on this issue. I found that in the ~/picture/iPhot Library/Database/ directory
there is a file called Library.apdb. This file has an entry for the secure disk image i have/had. I moved the file
to Libraryapdb.bkup and sure enough, my picture problem went away. The screen aaver panel no longer prompts
me to unlock my secure disk image.
So now the next chapter of my problem;when i open up iPhoto it wants to rebuild my photo library(which makes
sense and is what i want to haopen) so i allow it. After about 25 mins it has rebuilt the iPhoto library, but there is
one problem. The secure diskimage reference is back in the Library.apdb file that has been recreated!
So now i need to figure outnhow to get iPhoto to remove anynreference to a phot library i once had on the secure
disk image but have long since removed.
I first created an iPhoto library on my secure disk image by holding the option key and invoking iPhoto.
I removed that library awhile ago....
So how do i make iPhoto remove a no longer used iPhoto library?

"Backup disk image could not be mounted"

I have been using time capsule successfully for about 5 months. But now it has suddenly started returning a time machine error "the backup disk image could not be mounted".
Anyone got any suggestions?

towersfamily,
*_"The Backup Disk Image Could Not Be Mounted" (Console - “Failed to mount disk image”)_*
First, it is important to distinguish this error message from another, similar Time Machine error that states “The backup volume could not be mounted”. This is important as the causes and cures for these two errors can be very different.
Consider each topic below separately. When one option does not resolve your issue, then move on the next one.
*Unmount the Backup Disk Image* (TC)
If, for some reason, you have manually mounted the Time Machine backup disk image (sparsebundle), or Time Machine failed to eject it after the previous backup, subsequent backups may fail. (Console - “Failed to mount disk image”… “Backup failed with error: 21”)
Eject the backup disk image (white drive icon) by either clicking the little Eject icon to the right of the disk image in the Finders’ Sidebar, or Ctrl-Click the drive icon on the desktop and select “Eject” from the contextual menu. Now try backing up again or launching Time Machine to view previous backups.
*“Disconnect All Users…”:*
If your Time Machine backup drive (“Backup of Users Computer”) is mounted on your desktop or in the Sidebar of the Finder window. then Time Machine may think the drive is already in use. Alternatively, if the Time Capsule hard disk has been recently accessed by a Windows machine, it may not have fully relinquished control. Do the following:
Open Airport Utility and select the Time Capsule on the left.
Click “Manual Setup”.
Select “Disks” at top of window.
Click “Disconnect All Users…” at bottom of window.
Close the Airport Utility.
Now try Backing up again.
One poster reported: “I got it resolved. Apparently it had to do with one of the files being open on the disk from the drive. I had browsed the disk with one of my windows boxes here and it must have left one of the folders "open". Anyway, I rebooted the TC and we are good to go now.”
*Proper Computer Name* #
Make sure your computer has a proper name. Go to System Preferences --> Sharing. Time Machine needs to differentiate your computer from others on your network (i.e. "Bills MacBook" or "Office iMac"). If the "Computer Name" field is blank, create a name. Realize that if this step is necessary, you will likely have to start the Time Machine backup process over again and do another full initial backup.
According to this article, [http://support.apple.com/kb/TS1760], Time Machine may experience problems if your computer name includes certain characters. Make sure the computer name only includes ASCII characters from the following set.
(0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ)
Once a change in the computer name occurs, you should stop and restart Sharing on the affected computer. Uncheck and then recheck Sharing in the Services list on the left.
Let us know if any of the suggestions above helped to resolve your issue.
Cheers!

Disk image not mounted

I have had a host of problems since i installed a Time Capsule. The latest is that after reinstalling my system software -- another story -- I have not been able to make back-ups. The message I get is back up failed, disk image not mounted. What is this? On my time capsule there is a disk image of my hard drive on a dog eared page called a sparse bundle. I'm sure this is easy, but I'm stumped.

huk730,
Welcome to the Apple discussion!
Consider the following causes of that error message. Also bear in mind that when you reinstall the system software, Time Machine cannot continue using the same backups as before and will start a fresh set of backups. [http://support.apple.com/kb/TS1338]
*_"The Backup Disk Image Could Not Be Mounted" (Console - “Failed to mount disk image”)_*
First, it is important to distinguish this error message from another, similar Time Machine error that states “The backup volume could not be mounted”. This is important as the causes and cures for these two errors can be very different.
Consider each topic below separately. When one option does not resolve your issue, then move on the next one.
*Unmount the Backup Disk Image* (TC)
If, for some reason, you have manually mounted the Time Machine backup disk image (sparsebundle), or Time Machine failed to eject it after the previous backup, subsequent backups may fail. (Console - “Failed to mount disk image”… “Backup failed with error: 21”)
Eject the backup disk image (white drive icon) by either clicking the little Eject icon to the right of the disk image in the Finders’ Sidebar, or Ctrl-Click the drive icon on the desktop and select “Eject” from the contextual menu. Now try backing up again or launching Time Machine to view previous backups.
*“Disconnect All Users…”:*
If your Time Machine backup drive (“Backup of Users Computer”) is mounted on your desktop or in the Sidebar of the Finder window. then Time Machine may think the drive is already in use. Alternatively, if the Time Capsule hard disk has been recently accessed by a Windows machine, it may not have fully relinquished control. Do the following:
Open Airport Utility and select the Time Capsule on the left.
Click “Manual Setup”.
Select “Disks” at top of window.
Click “Disconnect All Users…” at bottom of window.
Close the Airport Utility.
Now try Backing up again.
“I got it resolved. Apparently it had to do with one of the files being open on the disk from the drive. I had browsed the disk with one of my windows boxes here and it must have left one of the folders "open". Anyway, I rebooted the TC and we are good to go now.”
*Proper Computer Name* #
Make sure your computer has a proper name. Go to System Preferences --> Sharing. Time Machine needs to differentiate your computer from others on your network (i.e. "Bills MacBook" or "Office iMac"). If the "Computer Name" field is blank, create a name. Realize that if this step is necessary, you will likely have to start the Time Machine backup process over again and do another full initial backup.
According to this article, [http://support.apple.com/kb/TS1760], Time Machine may experience problems if your computer name includes certain characters. Make sure the computer name only includes ASCII characters from the following set.
(0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ)
Once a change in the computer name occurs, you should stop and restart Sharing on the affected computer. Uncheck and then recheck Sharing in the Services list on the left.
Let us know if any of the above was helpful.
Cheers!
Message was edited by: Glenn Carter

HT3275 Time Machine error (109). Could not access backup disk image

I keep getting a Time Machine error message that says it can not access the backup disk image "……sparsebundle". I have had issue after issue with Time Machine. I have completely started over twice with setting up Time Capsule. Please help!

For informed suggestions, see #P2 in Pondini's excellent support document.....Using Time Machine with a Time Capsule
http://pondini.org/TM/Time_Capsule.html

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.

My back up failed and I get a messageTime Machine couldn't complete the backup to "TimeCap". The backup disk image "/Volumes/Data/Mary Fleming's MacBook Pro .sparsebundle" is already in use.

I noticed today that my last back-up was this a.m. and it has tried several times to back up since but I keep getting this message
Time Machine couldn’t complete the backup to “TimeCap”.
The backup disk image “/Volumes/Data/ MacBook Pro ."sparsebundle” is already in use.
I have never had this problem before and don't know what to do. I am not that great around computers so if anyone can help I would appreciate it. I did try to do some research but could not understand any of the content I read. I sure don't know what "sparsebundle" is and this is the first time I ever heard the term.
If anyone can help woold appreciate it.
I have Version 10.9.1

This is a standard issue..
Been around since LION but you missed out.. !! Well the old rule applies.. there are three types of Mac users.
1. The bugs have bitten you, and you have done the work arounds.
2. The bugs are biting you and you are now trying to find out what is going on.
3. The bugs will bite you. And in the meantime you laugh at everyone with problems and say it must be all their fault. Doesn't happen to my system.
You were simply in the last group.. now, with the wonders of mavericks to help, you got bit.
The solution is simple.. unplug the power cord from the TC .. count to 10.. power up the TC again.
No luck look at the more technical help.
C12 here. http://pondini.org/TM/Troubleshooting.html
Your naming might also be an issue if this continues to happen.. see C9.

How to fix this error message The backup disk image "/Volumes/AirPort Disk/FARES DEL VALLE's iMac.sparsebundle" could not be accessed (error -1).

how to fix this error message The backup disk image “/Volumes/AirPort Disk/FARES DEL VALLE’s iMac.sparsebundle” could not be accessed (error -1).

The troubleshooting C17 is the specific article.
http://pondini.org/TM/Troubleshooting.html
This is generally a Lion error.. and you will need 5.6 utility to get access to the disk area.
So download the real utility. Run it instead of v6 toy version.
http://support.apple.com/kb/DL1482
Go to the manual setup, disk page and click on disconnect all users.. that will unmount all users connected to the disk and allow it to start working. But there are a number of other issues that are possible cause. Pondini lists some of them.

MacPro backed up to Time Machine, added Mac Mini now get "The backup disk image "/Volumes/Data/Jerry Booher's MacBook Pro.sparsebundle" is already in use." error when Mac Pro tries to back up

MacPro backed up to Time Machine, added Mac Mini now get "The backup disk image “/Volumes/Data/Jerry Booher’s MacBook Pro.sparsebundle” is already in use." error when Mac Pro tries to back up

It is standard Mountain Lion error due to the networking ability which is comparable to wet string. (actually that was lion.. it dried out some with Mountain Lion.. higher in the hills perhaps!!)
See C12 and C17
http://pondini.org/TM/Troubleshooting.html
But many people are suffering the same issue..
And the above is even a little out of date.. you might need to do a reset to the TC.
Welcome to Apple's beta program for everyone.

HT3275 For the past several days, I have been getting this message during backups: Time Machine could not complete the back up. The backup disk image "Volumes/Data/iMac.sparsebundle" could not be accessed (error-1).

For the past several days, I have been getting this message during backups:
Time Machine could not complete the back up. The backup disk image "Volumes/Data/bhoppy2's iMac.sparsebundle" could not be accessed (error-1). When I click on the 'help' icon on the message, it reverts to a blank page, and I cannot find anything online regarding the term 'sparsebundle.' In addition, I cannot access previous backups any longer.
Help?

See C17 in Time Machine Troubleshooting by Time Machine guru Pondini:
http://pondini.org/TM/Troubleshooting.html

Iphoto is placed in a disk image (sparsebundle)

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