Why won't my external hard drive mount in Disk Utility even when it shows up on the list?

Hey all,
For the last few years I've used a Samsung S2 1TB external harddrive to back up all my files, this includes photos, music and a vast amount of resources required for Uni. However I plugged it in for the first time in about two months and discovered that neither my Macbook Pro (late 2011) or my Mac Mini (early 2013) are able to mount the hard drive.
It shows up in Disk Utilty however the harddrive is greyed out and when I manually try to mount it I get an error message saying that it can't be mounted and to use the first aid 'Repair disk permissions' feature which would be all good and well were that not also greyed out.
I've read a fair amount on this forum that suggest that Mavericks has caused quite an issue with harddrives and although I don't know for sure, the harddrive did stop working at a very similar time to when I updated. I've sinced used the basic version of 'Disk Drill' on the harddrive and all the files show up perfectly which leads me to believe that perhaps the issue isn't with the harddrive itself but perhaps a compatibility issue.
I was just wondering whether anyone had any advice or had suffered a similiar issue, preferably in relation to the Samsung S2 harddrive. The partition type is a Windows_FAT_32 and it's a USB hard drive.
Thanks in advance!

Because there's a problem with the disk's directory structure; these are often the result of improperly unplugging drives or forcing a computer to shut down. Proceed as instructed, or try using a more powerful utility such as DiskWarrior to repair it.
(111975)

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Why won't my external hard drive mount?

Hi
I am having problems getting my new iMac to recognise an external hard drive. It is a 40gb Western Digital hard drive that I copied over photos and music from my old computer (not an Apple) on. When I plug it in to the USD port it recognises the hard drive but then drops it after about 2 minutes and then it won't recognise it again until I restart the computer at which point it recognises it again for 2 minutes.
The hard drive work's fine on my Thinkpad and my Dell desktop.
Can anyone help?
Thanks.

It doesn't make sense.
Anyway, I found the solutions. Download software for solving this problem.
Here is the link:
http://www.macupdate.com/app/mac/24481/ntfs-3g

Why won't my external hard drive show up anywhere? Something wrong abt NTFS.

Why won't my external hard drive show up anywhere? Something wrong abt NTFS. After my OS turn to OS X Lion, this problem occur. I couldn't solve it, anybody?

It doesn't make sense.
Anyway, I found the solutions. Download software for solving this problem.
Here is the link:
http://www.macupdate.com/app/mac/24481/ntfs-3g

HT1338 I was backing up my MacBook with Time Machine on my new (correctly formatted) external hard drive. It was going fine when my 2 yo knocked the hard drive. Now TM said "failed" and the Mac refuses to recognize the external hard drive. Help please?

I was backing up my MacBook with Time Machine and using my new (correctly formatted) external hard drive. All was going well when my 2 yo knocked the disk leading to a "failure" by time machine (Latest Backup: Failed). Now the MacBook will not even recognize the hard drive. I have rebooted, tried all I can think of, but no acknowledgement of the drive. The drive itself makes noise and vibrates as if working, but nothing from the Mac. Please help or $100 down the drain... Thank you.

You may have already done these resets in the "tried all I can think of " portion of your post.....if not then here they are.....
PRAM
support.apple.com/kb/HT1379
SMC
support.apple.com/kb/HT3964
.....hopefully that is all that is required.....

How do you fix bad blocks on an external hard drive without using disk utility

so basically does anyone know how to fix bad blocks on a external hard drive without using disk utlility please

Oh...if you have data you are trying to save then its best to try cloning the drive to another one, which should save its data as-is to another drive. Hopefully you can do so without there being hangups around the bad blocks and keep at least most of your data intact. I'd recommend you try using Carbon Copy Cloner to do this, but you will need a secondary drive that is at least the size of the data on the problematic drive.

Why won't my external hard drive open

So I downloaded mavericks when it came out and now one of my external hard drives will not open but disk utility Will recognize the hard drive but I cannot access the lights on the hard drive work you can feel it spinning but it just won't access I've tried everything I know the hard drive fine why won't my Mac read my drive?

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

Why won't my external hard drive appear in Finder?

I have an Iomega 320GB SPHDU external hard drive which I was using as my backup disk for Time Machine and also to store other files (documents, photos, etc.). I have been using for some time now and never had any problems, however this morning, I plugged the hard drive into my MacBook Pro, which is from early 2011 and on operating system OS X 10.9.4, using the USB ports and the hard drive did not appear in Finder. I checked to see if it had appeared in Disk Utility which it does, but Disk Utility is telling me that the hard drive needs repairing. When I try to repair the hard drive, I get the message '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.' As I said I have never had any problems with it before, but this has just occurred this morning and I'm unsure why it has happened.

Because there's a problem with the disk's directory structure; these are often the result of improperly unplugging drives or forcing a computer to shut down. Proceed as instructed, or try using a more powerful utility such as DiskWarrior to repair it.
(111975)

Why won't my external hard drive connect to my mac anymore

I have a 1 Terabyte external HD that I use for my timemachine back ups. I eject it whenever I need to use my laptop away from my desk and re-connect it so it will do an automatic back up. the other day, it would not eject at ALL, so I ended up having to shutdown my laptop and disconnect it. Later, when I went to reconnect it to the laptop, my Mac doesn't recognize it. I have rebooted the laptop and the external hard drive multiple times, but when I plug the HD into the laptop, the Mac still doesn't "sense" it. I can't do any backups at the moment.

From reading similar threads, and from my own experiences, the prevailing wisdom seems to be that:
* the drive must be formatted as Mac OS Extended (Journal), not FAT32, NTFS or other
* the drive must not be currently used as a time machine disk
* (theory) the drive must not have previously been used a time machine disk
From my own experiences, I had 3 externals that worked w/ iMovie 11 but not w/ FCP X. With some experimentation, I was able to confirm the above items.
- one drive was a TM disk, and just wasn't ever going to work. Annoying, but at least an identified issue (or bug)
- one drive was once a TM disk but I'd stopped using it as such. I'd manually deleted the backups on it, but suspect that TM likely leaves invisble files around to identify meta on file lists, exclusions, etc. Showing invisibles in finder listed a plethora of files that I wasn't willing to research. Went into disk utility, formatted as Extended Journaled, and the disk started to appear in project and event windows in FCP X.
- one drive was formatted as NTFS. I use Tuxera to read/write NTFS and this seemingly caused no problems in iMovie. With numerous threads discussing FAT32/NTFS incompatability, I opted to format this disk and then restore my old iMovie events and projects. Again, this resulted in the drive being visible in FCP X.
One note, as mentioned above, in the case of the disk wehere I restored old iMovie events/projects, the disk didn't immediately show in the events window (but did show projects immediately). The solution was to insure that the events window was grouping events by disk. The default layout hid away my external disk until I did this--and once grouped properly, I was able to then import my iMovie events into FCP X successfully.
Good luck...the support for exernal drives (and likely NAS) seems really poorly documented. I lost at least two days to this.

Why won't my external hard drive show up in the hard drive list in final cut pro x?

I can't figure out how to get my external hard drive to show up in the list of available drives in final cut pro x. It works just fine in iMovie 11 and every where else on my MacBook pro. The external hard drive I am trying to get to appear is an iomega 1 TB hard drive. Please help as I have a ton of footage on it and don't have the room to move it to my internal drive on the MacBook.

I have the same problem with internal drives. Only the one with the largest free space shows up. The others ”blink” in the Event viewer, and then disappear. Sounds like a bug...
Regards,
Rabbe

Why won't my external hard drive show up in the hard drive list in final cut pro 8?

I can't figure out how to get my external hard drive to show up in the list of available drives in final cut pro x. It works just fine in iMovie 11 and every where else on my MacBook pro. The external hard drive I am trying to get to appear is an iomega 1 TB hard drive. Please help as I have a ton of footage on it and don't have the room to move it to my internal drive on the MacBook.

From reading similar threads, and from my own experiences, the prevailing wisdom seems to be that:
* the drive must be formatted as Mac OS Extended (Journal), not FAT32, NTFS or other
* the drive must not be currently used as a time machine disk
* (theory) the drive must not have previously been used a time machine disk
From my own experiences, I had 3 externals that worked w/ iMovie 11 but not w/ FCP X. With some experimentation, I was able to confirm the above items.
- one drive was a TM disk, and just wasn't ever going to work. Annoying, but at least an identified issue (or bug)
- one drive was once a TM disk but I'd stopped using it as such. I'd manually deleted the backups on it, but suspect that TM likely leaves invisble files around to identify meta on file lists, exclusions, etc. Showing invisibles in finder listed a plethora of files that I wasn't willing to research. Went into disk utility, formatted as Extended Journaled, and the disk started to appear in project and event windows in FCP X.
- one drive was formatted as NTFS. I use Tuxera to read/write NTFS and this seemingly caused no problems in iMovie. With numerous threads discussing FAT32/NTFS incompatability, I opted to format this disk and then restore my old iMovie events and projects. Again, this resulted in the drive being visible in FCP X.
One note, as mentioned above, in the case of the disk wehere I restored old iMovie events/projects, the disk didn't immediately show in the events window (but did show projects immediately). The solution was to insure that the events window was grouping events by disk. The default layout hid away my external disk until I did this--and once grouped properly, I was able to then import my iMovie events into FCP X successfully.
Good luck...the support for exernal drives (and likely NAS) seems really poorly documented. I lost at least two days to this.

External hard drive seen in Disk Utility, but will not mount.

My external hard drive has power and is spinning, but will not mount. It was fine yesterday. It shows up in Disk Utility and is verified and repaired. Tried the drive on 2 other macs with same result. Tried a new enclosure and that did not work. Tried all ports...usb and firewire. Any way to save my data?
I have screen shot of the partition info from Disk Utility for the hard drive included:

Hi Dominic,
If this is still not mounting, it may be worth trying a PRAM reset...
http://support.apple.com/kb/ht1379
Ben

Why won't my new hard drive mount on my new MacBook Pro but will mount on my old MacBook Pro

I bought a new MacBook Pro to replace an older MacBook Pro. I also bought a new Toshiba 1T portable hardrive to backup my new computer. The Toshiba hard drive will not mount on the new computer, but it will mount on my old computer.
However, I have two other portable hard drives (320 MB and 500 MB) that do mount on the new computer. I am puzzled as to why the new MBP will not display my Toshiba 1T portable HD.
Any ideas?

The only way I could get my Toshiba 1 TB USB 3.0 drive to work was to buy this cable from Amazon: http://www.amazon.com/gp/product/B005M0ICG2/ref=oh_o05_s00_i00_details
I tried a Kindle cable, I also ordered a thick data / power cable and it would not work. So I tried this dual USB cable and my drive is working great now.
You may be able to find it else were but the bottom line is you have to use both USB ports on your MacBook in order for this drive to work. I'm using a late 2011 MacBook Pro.
SyN

Why doesn't my external hard drive mount anymore?

Hi Apple genius'
I need some help here to avoid having to pay $$$ to send my hard drive off to be recovered. I was using it and deleting some old photos I'd not accessed in a long time and then the drive froze and crashed the computer. I had several apps open at the time and didnt think anything of it until I restarted the mba and the external drive didn't show. It doesn't appear in disk util, but does show in systen profiler (see attached pic). Is there any way I can get this drive back or does it need to be in the hands of the pros in a lab?
It's a western digital passport 1TB with a usb3.0 connection which has worked solidly since I bought it in Feb this year. I called the "tech support" who asked me to switch my mac off and on again then plug the drive in. Thanks WD! How helpful.
Can you guys out there help me?

Do you have a backup of your disk? If not, proceed at your own risk.
I would try to repair the disk using Disk Utility?
If that doesn't work... try DiskWarrior to repair the drive directory.
Beyond that you will need professional help to recover your data.

Why won't my external hard drive show up in iMovie 11?

My external USB drive - formatted as Mac OS Extended (Journaled) shows up fine on my desktop, and worked fine with iMovie in the past. Now, it won't show up in the event library, or in the "Save to:" menu when I try to import video. I can see my iMovie projects and events on the drive in Finder, but iMovie just doesn't recognize the drive. Argh!!! Any ideas?? Thanks in advance!

Luyen wrote:
Ignore ownership? Yep, it's checked.
although some say it's plain voodoo, but try the Disk Utilitys 'repair permissions' command
You'll find the DU in your applications/utilities Folder ........

Can't modify external hard drive partition with Disk Utility

Hi,
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. Can anybody help me repartitioning my drive without losing my data?
Thanks!!!

That would likely be because the drive is partitioned MBR and not GUID. You cannot repartition an MBR partitioned drive on the fly. What you need is a drive that is partitioned using GUID (GPT) with on partition formatted for the Mac and the other formatted FAT32. But to do that you must start the drive from scratch:
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the entire partition in the rectangle by clicking on it (the lines will turn darker blue) and click on the [+] Add button. The volume will be divided in two. Select each volume and resize as your require.
5. Select one of the volumes you just created. Set the format type to Mac OS Extended (Journaled.) Click on the Erase button.
6. Repeat Step 5 using MSDOS as the format type.
This will work with any PC that understands the GPT partition scheme which is Vista and Windows 7. Otherwise, you should just leave the drive as it is and forgo using Time Machine or purchase another drive for Time Machine.

Why won't my external hard drive mount in Disk Utility even when it shows up on the list?

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