OS X :: Disk Utility Reports Wrong Disk Size
Jan 13, 2011
I'm new to mac, have been using mine for only three months now, but couldn't help noticing a strange thing. When I go to Disk Utility or cmd+i on a selected partition, the size reported by OSX is incorrect. E.g. I have a 250GB disk, so I'm used to seeing 232GB as usable disk space, which is a totally normal thing. However, OSX tells me that my disk is actually 250GB. More advanced partition utilities (currently I'm using iPartition but suggestions are welcome) report the disk size correctly. So I began to doubt whether folder sizes are reported correctly or "scaled up" to match the size of the disk?
E.g. if I was an ignorant consumer and tried to put 250GB worth of data on the disk, it wouldn't fit as there is not enough physical capacity to accommodate it, is that right?
Is it the normal behaviour or I screwed something up in the system?
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Aug 26, 2009
I partitioned my disk using Terminal's diskutil. I decided i didnt need the partition anymore, so i deleted it (using Disk Utility.app) and added the free space to my mac partition. Basically, Finder and Terminal dont show the free space added back, and Disk Utility shows the space added back to the disk. I tried restarting, repairing disk (which coincidentally had an unrelated problem), repairing permissions, but the problem is still happening
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Jan 30, 2010
Disk Utility when repairing said my laptop had some nested folders that when beyond the recommended 100 deep. But it does not say where or what. I know there must be a real physical limit, and i am having disk problems and what to eliminate all possible causes.
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Jun 23, 2008
I have a LaCie d2 160GB hard drive hooked up via FW800 to my PowerBook and I've decided to resize some of the partitions on the drive. I've done this before without troubles, and running Verify/Repair Disk on the drive reports no errors, but when I go to resize any of the partitions on the drive.
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Sep 8, 2010
My new 2010 hexacore Mac will have 24G memory, an OWC Extreme Pro 120G SSD (positioned in the lower optical bay) and four 2TB WD RE4 drives. I'll use my old Synology 209 NAS (two 1TB WD Green Raid 1 drives) for TM backups over 1000Mbps Ethernet. Yes, I'll need to upgrade to a larger NAS very soon. This will be my first Mac Pro (have MBPs and iMac) and will be used for web design and development (mostly Adobe CS5 products).
The SSD will be used for boot and application files. I plan to use Disk Utility to create a 1+0 Raid array for data files. For a Scratch disk, should I:
1) create a partition on the 1+0 Raid Array for Scratch
2) partition a chunk of the SSD for Scratch
3) attach a spare external 2.5" WD drive via Firewire 800 for Scratch
Based on my reading, it seems that option 1 makes the most sense but I'm not entirely sure if you can partition a 1+0 array with Disk Utility. I'm pretty sure option 3 is quite silly but wanted to toss out the idea. Lastly, are there any generic recommendations on scratch volume sizing?
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Sep 20, 2009
I forgot the name of a small app that allows to browse a disk and calculate folder sizes in order to clean a disk. I think the icon was a disk with a broom over it.
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Feb 22, 2010
I bought a new 2TB Time Capsule, and had problems completing the initial backup. I finally sourced the problem to files that were buried deep in a stack of folders, which seemed to make the file name/path too long. Anyway before I realized that I tried to reformat the Time Machine, and this seemed to work ok. However Airport Utility is now reporting the Time Capsule Disk Size as being 1.8TB, rather than 2TB.
I think before I reformatted the disk it showed as being 2TB in this menu, but I cannot be sure. I am worried that I have somehow formatted it wrong and lost some data space? If I go into Disk Utility, it does say there that the Data partition is 2TB, so it seems strange that Airport Utility shows it at 1.8TB. Can someone else who has the 2TB Time Capsule let me know whether in Airport Utility it shows as being 2TB or 1.8TB?
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Oct 7, 2010
After I erase the hard disk it shows 74.5gb free, almost. It says there is 42.3mb of space being used by 2 files which I understand are used for read write or partitioning or whatever.
When I then leave disk utility and go to the actual installer, the destination disk (untitled - 74.5gb) shows only 73.9gb free space. What is taking up an additional 500mb of space on the hard drive?
Apple support told me that somehow the disk has been altered and I lost space on the disk or I am now using a seperate partition that isn't showing up. Disk utility shows only one partition with 74.5gb free space. He told me I can find information about how to 'merge' the disk on the apple support section under troubleshooting articles for disk utility. I have been unable to locate this information.
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Nov 25, 2009
I am trying to repair my disk so I can install bootcamp, but when I reboot my machine and run disk utility and choose repair disk, it hangs. Does anyone have any ideas ?
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Apr 24, 2012
I have a 2TB Western Digital My Book Studio FW800 external that has 5 partitions, connected to my 2011 iMac. I had help doing the partitions and don't really remember the reasoning, but one is just for my SuperDuper! backup, one is Miscellaneous, one for movie clips off my camcorder, one for misc scanned photo's and one for my genealogy research. I back up using Time Machine to a Time Capsule and also to this WD hard drive with SuperDuper!
Recently I'm getting a pop up message that "Mac OS X can't repair the disk "Genealogy"'. And it needs to be reformatted. It's become a read only disk. When I look in Disk Utility it shows all the partitions as "Mac OS Extended (Journaled)" EXCEPT for the one in question. I also noticed that there are a lot of files with "date created" being the same date in 1969! These files may be letters I've written or photo's I added to that partition within the last few years.
I think I have to completely reformat the entire external hard drive to repair this, but I want to make sure. Because it's going to be a major hassle backing it all up to another external (having to get one first) and then figuring out how to make the files that have turned "read only" in that one partition, back to their original state! Does this sound right, that I have to reformat the entire external hard drive? And how do I get the read-only files back to their original state.
Info:
iMac, Mac OS X (10.7.3)
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Jun 24, 2014
I get this question mark along with a folder when starting up. I tried holding down the option key when turning on the power and then I get an internet recovery along with a globe. I click on the arrow below it and it takes maybe 15 minutes to start up. Then i get this disk utilities screen. I'm now unable to do anything. When going into disk utility, disk 0 shows with Mac OS X base system underneath it. All the clickable buttons are faded out. Is there something wrong with the hardrive? and where could i get this fixed? There isn't a warranty on it.
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Jan 2, 2010
Running Diks Util on my iMac 10.6.2. i am given this warning.
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Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent" has been modified and will not be repaired.
Is it something I should heed and what to do in that case?
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Oct 9, 2010
I had windows vista installed but suddenly the audio decided to become faulty, after spending a day trying to fix it i realized I have a windows 7 install disc so i might as well just replace vista with windows 7. I didnt take care of vista or ever register it so it became quite a task to upgrade so i just deleted the partition and went to create a new one and just do a full install of windows 7.
I made the partition but the wrong format, so i removed it through boot camp assistant and created another, except now it keeps giving me the "back up the disk and use disk utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using boot camp assistant again" Now, I'd love to do this, except I have no idea what I'm doing and WHY this error has occured. After becoming frustrated I switched from my imac to my macbook pro and received the same error when trying to create a partition. So any help on exactly what I need to do would be a HUGE help. I only use windows for music production (I know, seems backwards, but I use Sony Acid and FL Studio so I'm stuck with Windows)
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Feb 28, 2009
I'm trying to repair my hard drive. I restarted from the OS X Mac Mini install CD (holding down the letter C when I heard the chime), opened Disk Utility from the Utilities folder, selected my hard drive image, but the "verify disk" and "repair disk" options are grayed out. I'm at a loss as to how to proceed.
Information:
Mac Mini
Mac OS X (10.5.8)
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Jan 9, 2010
I have 43GB available on a 120GB drive on my MacBook base model and I'm trying to partition via BootCamp.I'm trying to allocate 32GB to the Windows partition but I keep getting the following error message:Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again.Now I've backed up my disk and launched disk utility, and try to follow above directions here but the Mac OS Extended (Journaled) area is grayed out and when I click apply after highlighting the MacBook are (in blue), it errors out and says the disk is out of space.
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Aug 3, 2010
One of my drives is showing issues that Disk Utility isn't catching or can't find. I've heard about Diskwarrior, iDefrag, Drive Genius, etc... but which one is the most comprehensive, is there a "best of breed" disk app out there or one that does more than the others?
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May 14, 2012
Running Disk Utility's Repair Disk function from DVD, how long should this take to complete with a 1 TB drive? It's been nearly 24 hours so far. I booted the computer from the DVD, and after verifying the disk was told the disk needed repair.
Info:
iMac G5, Mac OS X (10.4.3)
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May 15, 2012
How do I launch disk utility from the Snow Leo install disk?
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Jun 12, 2012
I am having problems with my Mac running slow. I had a friend guide me to run a "repair disk permission".I did that but I am not sure if I am to click clear history.Also should I do anything else to help my Mac run better?
Info:
iMac, Mac OS X (10.6.8)
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Sep 12, 2014
Macbook Pro running on OSX Mavericks is having problems.
Today I turned my Mac on, and it started up with a loading wheel and a loading bar. When the loading bar finished, the Mac turned itself off. I tried many times, same happened every time. I then went into OSX Recovery, started repairing Macintosh HD, but the error message saying "Disk Utility can't repair Macintosh HD" came up and now I don't now what to do.
Is there any way I can back up my files in this situation? Is there any way I can repair the disk without having to erase all data and reinstalling OSX? Or do I really need to bring it to a Apple Store for repair?
Info:
MacBook Pro, OS X Mavericks (10.9.4)
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Jun 27, 2014
I have a Seagate 1 TB Backup Plus Drive which was working perfectly fine until I plugged it into a USB hub. It detected it while in the hub and I was able to get files off of it, but when I ejected it from the hub and put it back into the USB slot on the computer it was not detected by finder. It shows up in the disk utility and I clicked verify and repair and it says:
Verify and Repair volume “Seagate Backup Plus Drive”
Checking file system
Volume repair complete.
Updating boot support partitions for the volume as required.
Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
Is there any way to get this to work properly again? Or if not is there a way for me to recover my files on the external hard drive?
I have a Macbook PRO late 2011 running OS X Mavericks.
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Feb 22, 2010
I ran installer then went to disk utility and pushed disk repair. it ran and indicated in green that no repairs were necessary. i then went to startup disk and only the Diks and network startup showed up but no hard drive. i also open computer to make sure was not wet muddy due to leak in cooling system but all was dry
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Apr 30, 2009
I am having an issue Partitioning my Internal HDD because some files cannot be moved it was able to Partition a while back when Installed Vista but I deleted that Partition as I needed a bigger one for Windows 7 Beta It says I need to "Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume." does that mean I have to reformat my entire HDD? as I don't want to do that.
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May 26, 2009
I'm currently in the process of trying to install Win7 on my Macbook Pro (purchased July '07) using an ISO burned to a DVD with Disk Utility. Unfortunately, the DVD isn't bootable, and while the symptoms match what's in this blog post, the author's solution involved using a Windows-only program.
I'd like to know if it's possible to re-burn the ISO without the version number in the filenames as in the original solution, but with Disk Utility or something else that a Mac can use.
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Sep 7, 2009
Anyone knows why my external HD (USB disk connected to Airport extreme) does not show up in disk utility? (It sits on my desktop just fine and is fully functional) I' want to erase a partition but now i don't know how.
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Dec 2, 2009
I have a problem with Disk Utility , when trying to format an external fire wire drive.
I cleaned out the drive and proceeded to erase it with zeros. After this Disk utility will not display the subdirectory or verify, repair, partition, erase the disk. The main disk name is still visible, but I cant access any functions.
Error message says input output error.
DiskWarrior will not help, as the original directory is beyond recovery.
I suppose that I have damaged the original directory, and now I would ask the honourable forum if there is any remedy for my actions?
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Apr 27, 2010
If I want to make a bootable clone of my boot drive onto an external FW hard drive which I can restore from if my internal boot drive becomes corrupted, do I need 3rd party software like Carbon Copy Cloner, or can I just create an image of the boot disk in Apple's Disk Utility and save that to the external FW hard drive?
Apart from incremental updating, what is the difference between these two methods in terms of being able to restore my computer to a previous state with all my applications installed? (I keep my data stored on a 2nd internal hard drive and am happy with manually backing this up to another external HD). So my reason for wanting to make a clone of my boot drive is so that I don't need to waste time re-installing all of my applications from DVD...
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Apr 6, 2012
I have run the Disk Utility verify function against my system partition. It tells me there are minor issues that need fixing up and I should run the repair disk function, by booting using Command-R and using the Disk Utility to repair the drive.Problem is, when I boot using Command-R and select Disk Utility the partition is shown greyed out and the Verify and Repair options do not work.I think this could be because the partition is encrypted. The utility does not offer me the chance to unlock the partition with my passphrase.How can I repair the filesystem errors on this partition?
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Apr 25, 2012
Fortunately I got a time machine backup. And its restoring the drive while in Lion recovery mode. Here's what happened... I dont have a router a my place at the moment and so my two phones (iphone 4 and htc android) connect to my internet using my MBP's wifi via internet sharig. For some reason they were not able to get an IP from the mbp. After doing some wifi swtich toggles and forgettig & rejoining the network, i decided to reboot all my devices. I shut down my modem, phones and restarted my mbp. On reboot, after the chime, it showed an unsusal 'progress bar' under the apple logo. The bar progressed to about 10% and then the mbp just powered off. This happened several times even after PRAM and SMC reset.
So now i booted with cmd+r pressed and in recovery mode ran a 'verify disk'. It said the verification stopped and that i should repair the disk. When i tried to do that it said the disk cannot be repaird and that i should back up as many files as possible and attempt to format the disk and restore it with time machine. It is precisely what im doing at the moment.
1. Mbp wont sleep even when internet sharing is off
2. Mbp wont lit the onboard display upon opening it in clamshell mode until i removed the 3.5mm audio cable of my speakers from the audio out port!
Info:
MacBook Pro, Mac OS X (10.7.3), Mid 2010
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May 11, 2012
I want to erase a bunch of ancient floppy disks before dumping them and the drive, and I'd like to script an automated solution that will ensure that the media I'm erasing is in my floppy drive, and I'm not blasting one of my Hard Drives by mistake. I'm hoping that my script will be able to trace from the drive to the floppy to ensure that I've got the right target, else quit before doing any damage. The names of the floppy disks themselves are varied, but the name of the drive itself is stable and known. Disk Utility shows the name of the drive (Y-E DATA USB-FDU Media) and the name of the particular disk volume in the drive at the moment. I can find the floppies in the /dev/disk# special file, but I haven't found the drive itself.
I think Disk Utility automatically appends "Media" and maybe "USB-FDU" to a string that it pulls from somewhere, but I can't find that source. how/where Disk Utility digs up the info on the drive itself?
Info:
Mac Pro (Early 2008), Mac OS X (10.7.4)
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