Mac Pro :: External Hard Drive Seen In Disk Utility But Partition Won't Mount?
Sep 2, 2014
I've been running a Toshiba 1TB external drive on my Mac Pro tower and it's been working fine. But yesterday it wouldn't mount. I could see the drive in Disc Utility, but the partition wouldn't mount. I brought it into work where I'm running an iMac and it mounted just fine. Why would it stop working on one computer (where it was previously fine) yet work okay on another? And how do I get it working on the tower?
Info:
Mac Pro, iOS 7.1.2
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Aug 29, 2014
I've recently converted to the Mac-side:
I'm having difficulty with my external hard-drive, here's the info on that one:
Disk Utility won't allow me to mount the drive, I've tried using a number of softwares to read it (working under the assumption that it's an NTFS drive), including Tuxera and Paragon. I have too much stored on the hard drive to empty it back onto my old computer, and so I'm not able order to re-format it.
Info:
MacBook Air, OS X Mavericks (10.9.4)
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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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Jan 7, 2011
I have an external 750GB hard drive that I previously formatted as FAT 32 because I wanted to be able to plug it into Windows computers as well. I was not very thoughtful at the beginning and I just created one big 750GB partition. I currently have 450GB used and about 300GB free.
I would like to create a new partition in the free space without losing the data I have in the disk, and format the new partition as Mac OS Extended to use it for Time Machine backups. Presumably Disk Utility can do it, but when I go to the "Partition" tab it says "This partition cannot be modified" and the "+" sign below it is grayed.
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Apr 18, 2010
The hard drive is a 1TB Western Digital my book I bought it in January I think. I tried to format it to Mac OS Extended (Journaled) when I got it but for some reason every time I try to erase the part thats named disk3s2 or partition the main one it stops a little before half way through. I don't think its the hard drives fault so I called apple about it one day and they helped a little but it didn't work. Thanks in advance if you can help me. Also a few times I waited about seven hours for it while I was at school and when I came home it didn't move.
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Jan 29, 2010
I have a 1/3 full external drive that is currently formatted for MAC OS External.
I want to partition the drive in half and use the 2nd partition for Windows FAT32.
However, when I try to do this with Disk Utility it does not give me the FAT32 option.
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Nov 12, 2009
I was making a partition on my USB external drive in order to put a disk image of Snow Leopard on it, so I could boot off of it.
I added a 10GB partition to the drive, and clicked Apply. The following dialogue box came up:
Partitioning this disk will change some of the volumes. No volumes will be erased.
This volume will be added:
"Snow Leopard"
This volume will be resized:
"XXX HDD"
I clicked Partition, and it finished very quickly. I checked Finder, and the entire drive, BOTH partitions are completely empty.
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Aug 25, 2014
I wish to change partition scheme, sizes, in an external drive. All the partitions are MacOS extended (Journaled) and they map, according to the layout in Disk Utility, as follows: Partion 1, 2, 3,4 where 1 is at the top and 4, the bottom. I want to make partition 2 larger, so I decreased partition 1 by half. Now the layout is 1 a, 1b, 2,3,4., where 1b is now free space. Disk Utility will not allow me to increase the size of partition 2 by dragging the corner. Which of the following options (if any) will allow me to increase the size of partition 2, without erasing the data, using Disk Utility:Select partition 2 and manually writing a new value in the size box, equal to the present partition’s size plus the free space?If I delete partition 1 completely, will I then be able to increase the size of partition 2?If I delete partitions 1, 3, and 4, will I then be allowed to increase the size of partion 2?Is there another option?
(Actually, partition 3 is an eDrive, a data recovery utility created by TechTool Pro 7, so I don’t really know how it’s formatted.)
SeagateHD 1.5TB USB drive.
Info:
Time Capsule 802.11n (2nd Gen), OS X Mountain Lion (10.8.2), MacBook Pro, iBook Dual USB
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Apr 28, 2010
I have a Lacie 1TB external drive. I'm trying to create another partition on it using Disk Utility so that I can use one of the partitions for Time Machine. When I go to add another partition, or even just resize the existing one, I get an error saying drive must be HPFS+ with Journaling enabled. It is. I've seen reference to this error in searches, but have not found a solution. Is there a fix for this, or another tool that I can use to re-partition my drive without wiping out existing partition? I have about 450GB worth of data on the drive that I might be able to store somewhere else temporarily, I would just prefer not to have to go through that....
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Dec 26, 2010
I can boot into bootcamp with no problems. I have been wanting to be able to open the bootcamp in Parallels. Here is the issue:
1. The partition 'disk0s3' is greyed out in Disk Utility. It is not mounted. Mounting does nothing.
2. For reference, the Windows 7 is formatted as NTFS. It is a Windows 7 64-bit install
3. Verify disk does the following:
Verifying volume "disk0s3" ** /dev/disk0s3
Invalid BS_jmpBoot in boot block: efbbbf
Error: This disk needs to be repaired. Click Repair Disk.
4. repairing does the following:
Verify and Repair volume "disk0s3" ** /dev/disk0s3
Invalid BS_jmpBoot in boot block: efbbbf
Volume repair complete.Updating boot support partitions for the volume as required.Error: 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.
I have stuff on the Windows partition that I don't want deleted. I'm really stuck on this -obviously, I can just continue to boot into bootcamp, I just would rather open it from Parallels. I'm not sure what or if I made some mistake in setting up Bootcamp, I thought I followed the directions to that. I do know I formatted the partition as NTFS during the install - as I think Windows 7 requires it. I have tried installing NTFS-3G - it is installed, but didn't do any good when trying to mount the drive.
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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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Jun 3, 2014
Disk Utility Crashed whilst creating a Partition, and I now have ~100GB missing, which was the amount I had allocated to the new partition.
The new partition didn't get created, and I now have 100GB missing from the Hard drive. I have a 1TB hard drive, and when I go to Disk Utility, it says: Capacity : 999.35 GB (999,345,127,424 Bytes)Available : 586.1 GB (586,103,844,864 Bytes)Used : 310.52 GB (310,524,317,696 Bytes)
Which adds up to about ~900GB.
I tried Repairing Disk in Disk Utility, booting into Recovery Mode and Repairing Disk there, but neither made a difference.
Info:
MacBook Pro (15-inch Mid 2012), OS X Mavericks (10.9.3)
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Oct 17, 2010
I have an external hard drive that was used on a PC. I want to use it on a Mac. I went into disk utility and did an erase. (Extended Journaled and in security options changed it to zero out data). I can now use it on the Mac how ever it is telling me that there is 54.1 MB of used space. I want to have access to this. How do I do it?
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Sep 12, 2009
I installed SL two days ago and my LaCie firewire external has been working fine. i put it to sleep last night, and when I woke it up today, I got the warning telling me that I had disconnected it improperly (Which I hadn't, because the computer was asleep and the drive never was turned off). This has happened before and I usually am able to shut it off then turn it on again. But this time it won't mount. It shoes up in Disk Utility and System Profiler, but not in the Finder.I have tried switching firewire ports and restarting but to no avail.
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Dec 23, 2007
Will running the 'repair disk' disk utility on an external drive screw up any of the files on my external hard drive? I only want to run it because I can't transfer a file from my HD to the external...it's a 6 gig video file in quicktime format, and I'm getting 'error 1309', which I understand is related to file size on FAT32 format. I know it's a huge file, but I've moved others to the external that are over 20 gigs with no problems (iMovie projects, etc). Anything I can do to get this file moved to the external?
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Jun 10, 2012
I had downloaded some files to add to an external hard drive, the hard drive was assigned to a pc before adding these files so it wouldn't let me add files from my MacBook..
Had a look around online and made some changes (well thats what I thought) and I was able to transfer files form my MacBook onto the external hard drive.
What I then figured out was that there was nothing left on the hard drive except for the two file sI just transferred..
It turns out I deleted everyting without noticing.
The stpes I followed was to go to disk utility then select the hard drive and click erase (not knowing this would erase evrything).
So now I have two files on my hard drive and no idea how to recover the 'delted' files.
I tried using Disk Drill, which found the files but then it said I need to buy the full version to recover them.
I am wondering if there is any free methods to recover these files at all
Info:
MacBook Pro (13-inch Early 2011)
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May 27, 2009
A new Hitachi external HDD i downloaded will open in disk utility, but wont allow me to partition to format (gives me an error) and wont let me run repair or anything else. Trying to figure this one out.
All it will let me do is erase the drive to FAT
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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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Apr 15, 2009
I have a WD Terabyte drive that I have used for over a year with no problems. A couple of days ago my roommate went to use it and disconnected the drive from my computer without ejecting it first. He used it with his PC and disconnected it without "safely removing" it from his computer and now it will not mount to my desktop of been seen by PC. Disk Utility sees the device but I get an error when I try to repair the disk or verify the disk. It gives me an "error on exit" message. I really need the 700GB of info on that drive. Don't know what to do next.
Information:
Powerbook G4
Mac OS X (10.4.11)
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Aug 17, 2009
I've got an external 500gb Seagate drive with 2 journalised partitions.....one for my time machine backups and the other for holding audio samples for my drum machines and such. All of a sudden today the audio partition won't mount but the time machine partition still works fine. I go into disk utility and it shows ther but just says unable to mount when I try to mount it. It suggests first aid so I verify and repair numerous times and it says everything is ok. I can boot up Ubuntu in VMware andboth partitions are visible and all the files are there....everything is just as it should be. I was using 10.5.7 and just upgraded to 10.5.8 tonight and nothing changed.
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Mar 24, 2009
I'm trying to use my 500 GB external HD as solely a storage drive now whereas it used to be storage and backup, with separate partitions for each. I have deleted the backup partition (the first partition) successfully with Disk Utility, but how can I resize the remaining partition into the free space before it on the disk? I can't drag it or enter the desired size in the text box, it doesn't seem to want to get any larger. Is there any way to do this without purchasing ipartition? I have an old version from Tiger, but I'm not sure if that will work safely on leopard, and I do not want to lose my rather larger collection of ripped dvds on this external drive. Here's a screen shot of what i now see in disk utility.
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Jul 18, 2010
I deleted my Boot Camp partition in Disk Utility (as usual, Windows wasn't working and wouldn't fix). I resized my Macintosh HD partition to cover the whole drive and repartitioned. Now Disk Utility says that the partition's capacity is 160 GB and that I've used 40 GB and that 70 GB is available. My Boot Camp partition was 50 GB. I've read that to fix it I have to boot from my install DVD, go to Disk Utility, set the number of partitions to one, and delete the entire drive so that there's zero data left. Then I'd reinstall OS X and restore from a Time Machine backup. As of now, I have no external hard drive.
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Mar 31, 2009
I've been backing up my Powerbook G4 for a few months using Time Machine to an external firewire drive with two partitions; one for the backups, and a much larger one for all my music, video, pictures, etc. I got a new mac mini over the weekend and I want to format the Time Machine partition without erasing the one with all my other files so I can start backing up the Mini.
Is this possible using Disk Utility? If so, how?
Both computers are running Leopard.
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Aug 6, 2010
I have an external 500GB Freecom USB HDD with two Data partitions on it (FAT32 and NTFS). With a Windows tool, I made the two partitions smaller in order to free up some space (ca. 200GB) for an additional Mac OS Extended (Journaled) partition. This partition I wanted to create with the Mac OSX 10.6.4 Disk Utility. When I pluged in my USB HDD in my new iMac it mounted the two partitions, NTFS and EXT32 and the Disk Utility tool also showed the free (unpartitioned, almost 200GB) space on the HDD. Then, I chose to create a new Mac OS Extended (Journaled) partition and let the tool do it. ...which I probably shouldn't have done. Disk utility stopped and showed an error message saying that it cannot read the partitions anymore and that it needs to be closed. No partitions can be mounted anymore since then on this HDD. Here is the logfile entry of Disk Utility (unfortunately, it's in German):............
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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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May 25, 2010
My external hard drive has been corrupted and the error message is telling me to reformat it. However, through all the research I have done to find out how, everything I've found has told me to use Disk Utility to just erase everything on the disk to do this. When I try to do this, it tells me that I can't erase anything because the disk cannot be unnmounted. What should I do?
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May 20, 2009
I'm having a series of problems. First some intermittent audio problems with Garageband, then, then some external drives won't mount, and now I can't sync to my disk from the iMac. I've run Disk Utitilies a few times and when I do Verify Disk Permissions, it finds a list of things to fix, I then hit Repair Disk Permissions and it fixes them, and then hit Verify Disk, and it say the disk appears ok. When I do Verify Disk Permissions again though, it finds another long list of things to fix. Is this serious? What should my next step be? Should I reinstall the entire system?
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Dec 29, 2008
Just bought the WD Elements external Hard drive, plugged it in... and it won't mount on my G4!
-Checked all USB ports
-Doesn't show up in Disk Utility or System Profiler
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Oct 5, 2009
Hello everyone. I've been using an external Western Digital My Studio (500GB) drive for the last year or so with a Core2Duo Macbook Pro, and have had no problems until this morning. The drive is used primarily for Time Machine backups, but I also have some photographs stored as well.
This morning, just after I'd begun copying some of these files to another external drive, the WD drive went down, and now will not mount/showup in Finder. It DOES show up in Disk Utility, though with the Time Machine volume grayed out. I get a "could not mount" error when I click on the "mount" icon, and nothing else I try (rebooting, unplugging drive power supply, etc). has worked. I'm trying to avoid the erase-and-reformat option, because I'd lose some potentially valuable images.
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May 21, 2012
I have a Lacie 1TB external hard drive that keeps disconnecting from my Time machine to back up data.how to remount, I can not find it anywhere .....
Info:
Macbook, Mac OS X (10.5.1)
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