Disk Utility won't partition my drive.

I have a LaCie external hard drive with a capacity of 298 GB and 247 GB used leaving 51 GB free. I am trying to create a 30 GB partition of just free space, but when I tell Disk Utility to start, it will start working for a while saying "Modifying partition map" and have the blue and white barber-shop pole for the loading bar. After a couple of minutes, Disk Utility will popup with and error saying there isn't enough room on the drive. Can someone explain this to me?

Kappy wrote:
There are no free utilities for defragmenting a drive. Only the cloning I described is free.
Here's what you should do:
To resize the drive do the following:
1. Open Disk Utility and select the drive entry (mfgr.'s ID and size) from the left side list.
2. Click on the Partition tab in the DU main window. 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 new volume's size. The space below the resized partition will appear gray. Click on the Apply button and wait until the process has completed. +(Note: You can only make a partition smaller in order to create new free space.)+
4. Click on the [+] button below the sizing window to add a new partition in the gray space you freed up. Give the new volume a name, if you wish, then click on the Apply button. Wait until the process has completed.
You should now have a new volume on the drive.
That's what I did and it didn't work.

Similar Messages

Disk Utility won't partition ext. drive

Hi everyone,
I would like to split my external MyBook Pro drive in two so I can keep Time machine B/ups separate, but Disk utility keeps informing me that there is not enough space! I only want approx 80gb of the remaining 105gb. Where am I going wrong. Any help would be much appreciated. Thanks.

Are you willing to erase the contents on the external hard drive? Disk utility won't subdivide existing space, you have to do the entire drive at once. However, there are utilities (I believe they are purchase/commercial only) that will sub partition an existing disk partition.

Disk Utility won't erase iMac drive

I have a late 2012 27" iMac.
I was taking it to the Apple Store to fix The Mechanism™ broke. (The tilt hinge). As I knew fixing it would entail leaving the iMac there for several days, I cloned my drive and erased the iMac.
HOWEVER, when trying to do it, both form a USB install drive I set up AND from the Recovery Partition, Disk Utility would fail to erase the drive. It would quit and go back to the install drive directory.
I then booted back to the regular drive, manually dragged most of the stuff to the trash and emptied it. I then went back to the USB drive and tried one last time.
This time, the drive reformatted like it was supposed to. I tried again, it worked again.
I loaded Mavericks on, and packed the iMac up and went to the store (where it is now).
The "Genius" had no idea why the erasing didn't work earlier, and since things now did work, I couldn't replicate. They're diagnostic scan showed everything was good.
It's the 1TB + Fusion drive.
BEFORE I manually erased everything, there was around 120 gb free on the drive. After there was 900+gb free.
Anyone seen anything like this? Have ideas what was happening?

Kappy wrote:
There are no free utilities for defragmenting a drive. Only the cloning I described is free.
Here's what you should do:
To resize the drive do the following:
1. Open Disk Utility and select the drive entry (mfgr.'s ID and size) from the left side list.
2. Click on the Partition tab in the DU main window. 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 new volume's size. The space below the resized partition will appear gray. Click on the Apply button and wait until the process has completed. +(Note: You can only make a partition smaller in order to create new free space.)+
4. Click on the [+] button below the sizing window to add a new partition in the gray space you freed up. Give the new volume a name, if you wish, then click on the Apply button. Wait until the process has completed.
You should now have a new volume on the drive.
That's what I did and it didn't work.

Disk Utility Fails When Partitioning FireWire Drive

I am getting this error when attempting to partition my FireWire drive.
"Disk utility has lost its connection with the Disk Management Tool and cannot continue. Please quit and relaunch Disk Utility."
I know that Panther users have been having this same error pop up when they attempt to repair permissions. Something about the iTunes 6.0.2 update. I attempted to remove the package files, which was the fix for that issue, and then partition the drive, but it didn't help. This is a different issue. I can repair permissions fine, as well.
Booting from the Mac OS X Tiger install DVD, and using Disk Utility from there, works just fine. I want Disk Utility to work from the startup volume, however.
Has anyone else experienced this issue?
Does anyone have any suggestions as to how I can correct it?
Thanks!

10.4.6 Combo Update has fixed the issue.
Thanks so much! I'm glad you happened to be awake and reading this board. I think something strange happened with the 10.4.6 update in the first place, because my Dock is always restored to the default look (I customize it with TransparentDock) every time Apple updates the OS. Also (maybe I shouldn't say this on an Apple board), my iBook is running Front Row, and it wasn't broken after the update, but it is now, which is fine, as long as Disk Utility works.
Thanks again for your help!

Disk utility fails to resize portable drive partitions with error message "requested change in size is too small".

I am using a 1TB WD studio passport portable drive with my 2011 MacBook Pro. I have the portable drive partitioned into 4 volumes: 355 GB, 320 GB, 320 GB, & 4 GB. But Disk Utility won't allow me to split the third of those into 160 GB /160 GB. All volumes verify as seeming "to be okay". Seems if Disk Utility could create me a 4GB partition that 160 GB is plenty big enough, right? Something's not right; Can you help me with this please?

What is on those partitions and or the partition you want to split in two?
If you don't have any data on partitions or if you can save it someplace else for the time being then why not just Re-Partition the whole drive into the sizes you now want.

Disk Utility won't resize a partition

Disk Utility won't resize (eliminate smaller partition from a 2-partitioned internal) Hard Drive. This is the message I get:
"Partition failed
Partition failed with the error:
Filesystem resize support required, such as HFS+ with Journaling enabled."
Help files offer no information on this error. I followed the Help instructions to do this operation, but the resize doesn't work. The older, smaller partition shows up in Disk Utility but is dimmed out. It will activate at highlight, but is not recognized on the desktop.
Any suggestions as to how to fix this problem?

Intel based Macs use a different partition scheme called GPL or GUID rather than what PowerPC used, APL.
You could try reformatting, or get a new system, and run BootCamp and Windows even.
Even if you've used Macs for years, there is always a place on my book shelf for this one, David Pogue's "Mac OS X: The Missing Manual (Leopard Edition)"
http://books.slashdot.org/books/08/02/27/1551206.shtml

If leopard won't boot from dvd, use disk utility mount to partition

wanted to share a way that i successfully installed os 9, tiger, and leopard on 1 hard drive. first of all, leopard was the only installation that i had difficulty with. it would not boot off the original dvd, no matter if i held down the 'c' key or the option key, so this is what i did after a lot of reading on the internet to try and troubleshoot this issue.
First thing i did was partition my internal hard drive in 3 partitions using disk utility. the 3rd partition was around 9gb. I installed os9 first on the 1st partition, i then installed tiger on that same partition. then i put in my leopard dvd, and opened up disk utility. and clicked on "restore", and dragged the dvd image as the "source", and chose the 9gb partition as the destination, and clicked on restore. then, i changed the "startup disk" to start from the 9gb where i just restored the image, and rebooted, and went through the leopard setup and chose the 2nd partition as the place to install. this should work with the dvd, or if you made an image from the dvd. I hope this helps someone else whose dvd won't boot, because it was very frustrating after you purchase a faster processor, and faster video card so that your system meets the requirements, and then the dvd won't boot.

Two ways. Use another computer to restore the install disc to one of those ext HD. Then, use it to boot the other machine. Get an ext CD/DVD reader and use it to read the install disc and boot the machine. However, if both the HD and optical reader are kaput, then a trip to an Apple repair station is in order.

Disk Utility: Backup to partition on external drive?

Hi people. Would be glad of an answer and any comments on this.
I have 3 Macs at home, a new G5 dual core and 2 G4 imacs, networked wirelessly. At this point I only backup my G5 to a second internal HD, by using Disk Utility's 'Restore' function.
My preferred plan is to get an external Firewire 400 drive, make 3 partitions on it, and do the Disk Utility 'Restore' for the 3 respective Macs. That way it's not only a backup, but a bootable solution if one of the machines dies.
My second choice is to add one of those generic network hard drives to the router and try to back up to that(essentially as an FTP/Samba disk), but it would be slow and not bootable at all.
Question: Will disk utility allow a partition, either on a firewire drive or network drive, to be the destination for a 'restore'? Or will it only recognise whole volumes?

Hi, Daniel.
You wrote: "Question: Will disk utility allow a partition, either on a firewire drive or network drive, to be the destination for a 'restore'? Or will it only recognise whole volumes? "Disk Utility will recognize a volume (partition) on a FireWire drive as the destination for a Restore.
Using the Restore function for backup is quite time-consuming as it has to backup everything every time you perform a backup. You will get much faster results by using a proper Backup and Recovery solution that supports incremental backups, i.e. backing up just the changes from the source to the destination (backup) so that the two are synchronized. For advice on the backup and recovery solution I employ, see my "Backup and Recovery" FAQ.
People have had mixed results using NAS (Network-attached Storage) for backups. I frankly think that it's still a bit early to try that route. Using an external FireWire drive has always given be good results.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

Desktop or Disk Utility won't show External Hard Drives

The Desktop or Disk Utility won't show 2 of my old external hard drives and so they are currently unsusable. My computer however recognise other external drives.
320GB Western Digital MyBook Premium model number: WD3200D032-000
500 GB Western Digital MyBook Premium model number: WD5000E032
I have same issues both of these external drives.
The blue circle lights come on so power is getting to it.
Tried 2 USB cables, one I know for sure is working - Nothing.
I am using Lion 10.7.4 on a mid 2009 13" MacBook Pro
All efforts to help much appreciated

No they haven't worked on this computer before. I using them on my old MacBook Pro (a computer which is no longer working) which ran Snow Leopard.
The 500GB drive "stopped working" with that old MBP too
But the 320GB drive was always working with old MBP if I remember correctly.
Cheers

Disk Utility won't add new partition

I have an external 250GB hard drive connected via USB to my Mac Mini (Early 2009) computer. The drive has a GUID partition table that was created using Windows Vista SP 1. The first partition on the disk is a 128MB Microsoft Reserved partition. The second partition is a 120GB NTFS partition. When I try to use Disk Utility to partition the remaining 112GB of space as a Mac OS Extended Journaled partition I keep getting an error message stating "MediaKit reports no such partition". How do I get around this bug in Apple's Disk Utility application?

techguy378,
As they always do, Microsoft has undoubtedly created "their own" proprietary implementation of the GUID partition table. The effect, in this particular case, is that Disk Utility cannot see that unused space. That doesn't mean this is a Disk Utility "bug."
If one were to do the same thing with Disk Utility- create 2 partitions on a drive that do not fill the drive- that empty space would be included in the partition map. Simple. In your case, however, it appears that Vista has just excluded that empty space from the map entirely. Neat trick, huh?
I think your only solution will be to add a partition in Vista, if that is possible without destroying the current volumes. You can then reformat the new partition in Disk Utility.
Scott

How to recover after performing an 'Erase' and then 'Partition' within Disk Utility of an External USB drive?

Hi - I accidently ran an 'Erase' and then 'Partition' within Disk Utility of an External USB drive (meant to run it against another drive that was plugged in). Does anyone have any suggestions on if it is possible to recover from this? It has all my family photos on it and my backup is a few months old :-(
I tried running Stellar Phoenix Mac Data Recovery but it found what looks like basic mac folder structure (probably from the first erase). I think what messed me up was that I rain the repartition which formats the drive a 2nd time! Any help is truly appreciated!
thank you,
-Steve

Hello RalphR_MI,
Take a look at this page, which lists several articles. Please let me know if any of these help you restore your backup.
Also, take a look at this article, as well as this one.
I hope this helps. I'm not sure of a few things, so I'm sorry for sending you so much, but I'm confident it will give you something new to try.
Please let me know if this helps. Good luck!
↙-----------How do I give Kudos?| How do I mark a post as Solved? ----------------↓

Disk Utility won't let me delete the partition disk

can some body help me for that ...?

What specific steps have you tried so far. Is your disk full (with only a few GB left on it)? When you go to Disk Utility, are you selecting your drive device (above the listed volumes) or are you selecting your boot volume or other volumes in an attempt to split them up?

Stuck at "starting login window" and Disk Utility won't fix it...

I downloaded some security updates, and since restarting my computer as required, I have never been able to start it up since. It gets stuck on the "starting login window" screen, with the little blue bar still shimmering and mouse still moving, but just won't ever load the login screen, even after hours.
I've seen a few other people have had this problem, and tried to follow some of the recommendations, with no joy. I tried several times to repair the disk permissions with Disk Utility, but it has an internal error saying it lost the connection to the disk manager, or something similar.... when I try to repair the disk, it fails saying something about "overlapped extent allocations" and an "invalid node structure".
I can start up in single-user mode, and doing a fsck had the same result.
What can I do??? Some people suggested an Archive and Install manoeuvre, but I'm scared of losing all my files! Will it erase them all? Do I have to back up all my files before doing this? How can I back them up if my computer won't start?
I know almost nothing about computers - all I know I have found in the past few days searching through these discussion boards trying to find an answer! I have an important essay due on Monday which is stuck in my computer, so I'm a little scared!
I'm using Mac OS X Panther or something.... not sure how to find out exactly which one, as my computer won't start!
Any help would be greatly appreciated!
iBook G4

Hi, you have some serious directory damage there, and it was probably there before the updates. An Archive and Install would not be recommended. If you did that you would likely have more problems then you have right now.
If it were me I'd run Diskwarrior and Tech Tool Pro on it. DW for the invalid node structure and Tech Tool Pro for the Overlapped Extent Allocation. But you probably would have to buy both of them, and there's no guarantee either one will fix it.
Apple doc.#25770, talking about Overlap..... says the easiest way to fix it is to Erase and Install. If you are running 10.3.9 and had access to a retail Tiger disk, you could try booting up on it and running Disk Utility. Tigers DU has the ability to fix Overlap.... sometimes, Panther's does'nt.
This is the best way to Erase and Install. First backup all your important stuff, if you can, as the following will erase everything on your drive; it will be unrecoverable. Put your install disk in your Mac and Restart while holding down the C key. In Tiger, When you get to the install screen, don't click install and go to the title bar at the top of the screen and click on Utilities (in earlier OS's click on the installer menu).
Click on Disk Utility and choose the hard drive you want your OS on. Then click on the Erase tab. In Tiger, click on the Security Options button near the bottom (it's similiar for Panther and Jaguar).
Once in there choose Zero Out Data (write zero's in earlier versions). This will map out any bad blocks on your drive and bring it back to almost new condition (providing there's nothing wrong mechanically with it, bad bearings, defective or damaged surface, etc.).
Once this is done, go back to the install screen and begin the "Erase and Install" installation. This will put a factory fresh system on a clean hard drive.
Cheers!
DALE

Disk Utility 13 problem with USB drives

There appears to be a problem with Disk Utility 13 (part of OS X 10.9). At least, so far as I can tell, everything traces back to this app, or possibly OS X 10.9 itself.
I recently upgraded my MacBook Air to OS X 10.9 (reformatted hard drive, installed system from scratch, updated with all the latest Apple updates). I pre-checked all my third party software to make sure it was 10.9 compatible before installing it after the system cleanup, so everything I’m running supposedly has been approved as safe for 10.9. But I’m seeing a problem formatting USB drives that I do not encounter when running under 10.8.
I have a Seagate STAA500101 (“FreeAgent GoFlex”) drive connected via Seagate’s USB3 adapter that I’ve used for some time as a Time Machine backup. Post-overhaul, I decided to erase the backup and start fresh. When I attempt to format it (single GUID partition) with Disk Utility, I see the following messages go by:
Formatting disk1s2 as Mac OS Extended (Journaled) with name Untitled 1
Could not mount disk1s2 with name (null) after erase
Then there’s a pause, and the format appears to conclude fine. But if I run a “Verify Disk” immediately, I get this:
Verifying partition map for “Seagate FreeAgent GoFlex Media”
Checking prerequisites
Checking the partition list
Checking for an EFI system partition
Checking the EFI system partition’s size
Checking the EFI system partition’s file system
Checking all HFS data partition loader spaces
Volume on disk1s2 has 0 bytes of trailing loader space and it needs 134217728 bytes
Problems were found with the partition map which might prevent booting
Error: Partition map needs repair because a data partition needs loader space.
As the drive has just been formatted, that seemed odd. I took it over to another Mac still running 10.8.5 and formatted it there — it worked just fine. Verified just fine. Took the drive back to my MacBook Air and tried to verify the disk — same failure.
I wanted to rule out bad media, so I took a Lexar 16GB USB flash drive and tried to format it with Disk Utility 13 — got the same problem.
The only success I’ve had formatting USB drives under 10.9 is to boot up into OS X Recovery. Disk Utility there formatted my Seagate drive without an error. But once I booted back into normal 10.9 operating mode, the drive once again fails to verify; it makes me leery about using it as a Time Machine backup.
I suppose it’s possible there could be some background component like Sophos causing problems when formatting drives, but if I format a drive via OS X Recovery or another Mac under 10.8, that wouldn’t explain why the drives fail to verify.
Anyone got any other observations on this issue?

Problem resolved. I'm posting this note for anyone else who might run into this situation and come across this discussion.
It actually did turn out to be Sophos -- Cloud, that is. I'd been using Sophos' free Mac antivirus software on a variety of systems but forgot that I was now testing out Sophos Cloud on my own MacBook, which is their new endpoint solution, and supposed to be compatible with OS X 10.9 (although the Mac version is listed as "beta") Sophos Cloud includes a new feature called Device Control which allows you to create a company-wide policy to control access to hardware such as USB drives, optical drives, etc. But apparently it's still pretty buggy. I had my Device Control configured with the default setting of "monitor but do not block" but it was most definitely gumming up the system. With Sophos Cloud installed, here's what happens if I try to run "Verify Disk" on any attached drive. Note on the left side how "disk2s2" shows as a sub-volume for each hard drive.
So if I uninstall Sophos Cloud, reboot and rescan, here's what I get:
Works fine. Note that the "disk2s2" subvolumes are also gone. This is the way Disk Utility also appears on a 10.8 or 10.9 system, even if you have the standard free Sophos for Mac software installed. It's only Sophos Cloud that's not playing nice. It also appears to have stopped me from being able to play DVDs from an attached Apple USB SuperDrive -- that problem was likewise solved by removing Sophos Cloud.

Disk Utility won't start up in 10.5.3

I have been unable to open up my Disk Utility at all. I was able to do so earlier, perhaps with 10.5.0 while I was mounting my external hard drive. Now, I cannot mount the hard drive, and therefore cannot use Time Machine all because DIsk Utility won't open. I've diagnosed my hardware with "Disk 1" and found no problem. And, I've reinstalled the operating system. Any ideas?

Chris:
I just had the same issue on my son's MacBook. As long as you have a wired keyboard, the following will work.
1. Shut down the computer if it is on.
2. Press the power button to start the computer.
3. Immediately press and hold the Command (Apple) key and the "s" key for single-user mode.
4. Type mount -uw / (then press the Return Key) wait for next line to appear with # root/
(there is a space between t and - and another space between w and /)
5. Then Type "passwd" (without quotation marks then press the Return Key)
6. Enter new password (this will be for the root user account) (watch your fingers when you type because it doesn't show what you are typing, then hit the Return Key after you type it.
It will prompt you to retype the new password again, so retype it again and then hit the Return Key) wait for next line to appear...
7. Then Type "reboot" (without the quotes and hit the Return Key)
after the computer restarts and comes up with the login window....
8. Login with any of your usernames just to get the desktop up.
9. After desktop comes up choose System Preferences, then choose accounts. Unlock if you have to and using the username: root ..... and the password you just setup in the single user mode You now should be able to make users including your existing user account an admin.
After you log back in under your real account, it is advisable to deactivate the root user account. To do this,
1. Click the Finder icon in the Dock.
2. From the Go menu, choose Utilities.
3. Open Directory Utility.
4. Click the lock in the Directory Utility window if you need to unlock the utility.
5. Enter an administrator account name and password, then click OK.
6. Choose Disable Root User from the Edit menu.
Hope this helps.
David

Disk Utility won't partition my drive.

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