Non-formatted External Harddrive not showing in Disk Utility

I have an empty external hard drive that is not formatted. I would like to format this and use for storage of some of my larger files. However, it doesn't show up in Disk Utility, or also doesn't show up when checking off "Show External Drives" in finder preferences. If I have it plugged in to the mac during start up, I only get a grey screen, the mac will not start. I've tried this on my 2010 Macbook Pro and 2012 Macbook Pro, same results. I have to unplug it for the computers to start. Both are running OSx Yosimite. Any suggestions of programs that will format this

Sounds like a broken ext HD. Replace it.
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.2), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

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External drives not showing in disk utility

All of a sudden, my mid 2011 iMac has stopped recognizing 2 external hard drives via either FW800 or USB. The drives don't even appear in the Disk Utility. I switched to another account, and the drives still do not appear. Flash cards still work, either via the slot on the side or via an external reader plugged into the same USB port which would not connect to an external hard drive.
How do I sort this out? Thanks.

Hello
try use your 2 HD into other mac ?
try change cable ? check for power cord ?
HTH
Pierre

Thunderbolt WD Duo, does not show in Disk Utility

Hi Have imac 27 (late 2012) with 10.8.3 update OSX. Connecting to WD Thunderbolt Duo, the disk does not show in disk Utility, sys log or in any connection to the system. WD utility does not seems it either. Restart does not help. By disk returning to seller, the disk works fine on other comp (with the same cable, with the same power adapter)
Is there any issue known with the thunderbolt ports? Tried both all found on internet, but no resolution, to my issues.
Seems to be my imac hardware or maybee the software (thunderbotl 1.2) update.
Lukas

All thunderbolt port tried, cable exchanged, no change
I have done following procedure , no change
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

External hard drive not showing in disk utility

my samsung external hard drive has always worked with no problem on my mac..
I have just plugged it in to do some work and it will not appear anywhere..
not even in disk utility
i have tried the USB port and it is working fine because i also have a mouse and that worked fine in that port..
PLEASE SOMEONE HELP ME!

Try following tips.
USB and FireWire Quick Assist - Apple Support

External harddrive not show correct files

thanks for your time.
i've not had this problem before. i have an external harddrive and lately some of the files have been incorrect. and now it's been happening to most of the files on the drive. for example if i click on a video file a different video will show. it's usually on of about 3 videos, so if i click on 30 different video files, the same wrong movie will show up about 25 times. other videos won't open at all. the same for a lot of pictures on the drive and other types of files.
the drive is probably suffering from some kind of corruption, but i'm not sure if the part of the drive that points to a file is corrupted and can be repaired maybe. i've ran disk utility and it says the drive is fine. has anyone else had this issue and come to a conclusion short of running a recovery program?
thanks.

HI sorry thats what I ment. The disk utility(application) in the folder utilities. The strange thing is that Yesterday the hard drive did apear there. I thought maybe it has something to do with NTFS application. As before I had installed this I could only read but notwrite to files on the hard disks. So I uninstalled and reinstalled the software,,,,,now the hard disk does not appear anymore in disk utilities .....I'm getting futher away from an solution .... :-( what can this be ? ever heard of an problem like this ? I thank you in advance for taking your time to look into this problem.
Regards,
Terrence
see both screeshot. Only the usb stick appears. and see preferences also

My external HD will show in Disk Utility but not in Finder

Here is the External hard drive info.
Type :           Partition
          Disk Identifier :           disk1s2
          Mount Point :           Not mounted
          File System :           Mac OS Extended (Journaled)
          Connection Bus :           USB
          Device Tree :           IODeviceTree:/PCI0/EHC2@1A,7
          Writable :           Yes
          Universal Unique Identifier :           A15B5F63-3A83-30E2-B2D2-7EF07CF136BE
          Capacity :           999.86 GB (999,860,912,128 Bytes)
          Owners Enabled :           No
          Can Turn Owners Off :           Yes
          Can Be Formatted :           Yes
          Bootable :           Yes
          Supports Journaling :           Yes
          Journaled :           No
          Disk Number :           1
          Partition Number :           2
It will show up in Disk Utility but not show up in finder. Ive tried mounting it, verifing it, repairing it. Nothing is working. I dont know what else to do! Please somebody help! I was in the process of backing this up when this happend

Also, here is the log of my disk utility with my external. Im not sure if that will help at all
===== Tuesday, September 3, 2013 11:18:20 AM Pacific Daylight Time =====
2013-09-03 11:18:24 -0700: Verifying partition map for “Seagate Backup+ RD Media”
2013-09-03 11:18:24 -0700: Starting verification tool:
2013-09-03 11:18:24 -0700: Checking prerequisites
2013-09-03 11:18:27 -0700: Checking the partition list
2013-09-03 11:18:27 -0700: Checking for an EFI system partition
2013-09-03 11:18:27 -0700: Checking the EFI system partition’s size
2013-09-03 11:18:27 -0700: Checking the EFI system partition’s file system
2013-09-03 11:18:27 -0700: Checking all HFS data partition loader spaces
2013-09-03 11:18:27 -0700: Checking Core Storage Physical Volume partitions
2013-09-03 11:18:27 -0700: The partition map appears to be OK
2013-09-03 11:18:27 -0700:
2013-09-03 11:18:27 -0700:
2013-09-03 11:18:43 -0700: Verifying and repairing partition map for “Seagate Backup+ RD Media”
2013-09-03 11:18:43 -0700: Starting repair tool:
2013-09-03 11:18:43 -0700: Checking prerequisites
2013-09-03 11:18:43 -0700: Checking the partition list
2013-09-03 11:18:43 -0700: Adjusting partition map to fit whole disk as required
2013-09-03 11:18:43 -0700: Checking for an EFI system partition
2013-09-03 11:18:43 -0700: Checking the EFI system partition’s size
2013-09-03 11:18:43 -0700: Checking the EFI system partition’s file system
2013-09-03 11:18:44 -0700: Checking all HFS data partition loader spaces
2013-09-03 11:18:44 -0700: Reviewing boot support loaders
2013-09-03 11:18:44 -0700: Checking Core Storage Physical Volume partitions
2013-09-03 11:18:44 -0700: Updating Windows boot.ini files as required
2013-09-03 11:18:44 -0700: The partition map appears to be OK
2013-09-03 11:18:44 -0700:
2013-09-03 11:18:44 -0700:
2013-09-03 11:18:46 -0700: Verifying volume “Steven Polanco Mac”
2013-09-03 11:18:46 -0700: Starting verification tool:
2013-09-03 11:18:46 -0700: Checking file system2013-09-03 11:18:55 -0700: Checking Journaled HFS Plus volume.
2013-09-03 11:18:55 -0700: Checking extents overflow file.
2013-09-03 11:18:56 -0700: Checking catalog file.
2013-09-03 11:19:10 -0700: Checking multi-linked files.
2013-09-03 11:19:10 -0700: Checking catalog hierarchy.
2013-09-03 11:19:22 -0700: Checking extended attributes file.
2013-09-03 11:19:34 -0700: Checking volume bitmap.
2013-09-03 11:19:35 -0700: Checking volume information.
2013-09-03 11:19:35 -0700: The volume Steven Polanco Mac appears to be OK.
2013-09-03 11:19:35 -0700: Repair tool completed:
2013-09-03 11:19:35 -0700:
2013-09-03 11:19:35 -0700:
2013-09-03 11:19:39 -0700: Verify and Repair volume “Steven Polanco Mac”
2013-09-03 11:19:39 -0700: Starting repair tool:
2013-09-03 11:19:39 -0700: Checking file system2013-09-03 11:19:39 -0700: Checking Journaled HFS Plus volume.
2013-09-03 11:19:39 -0700: Checking extents overflow file.
2013-09-03 11:19:40 -0700: Checking catalog file.
2013-09-03 11:19:54 -0700: Checking multi-linked files.
2013-09-03 11:19:54 -0700: Checking catalog hierarchy.
2013-09-03 11:20:06 -0700: Checking extended attributes file.
2013-09-03 11:20:18 -0700: Checking volume bitmap.
2013-09-03 11:20:19 -0700: Checking volume information.
2013-09-03 11:20:19 -0700: The volume Steven Polanco Mac appears to be OK.
2013-09-03 11:20:19 -0700: Volume repair complete.2013-09-03 11:20:19 -0700: Updating boot support partitions for the volume as required.2013-09-03 11:20:29 -0700: Repair tool completed:
2013-09-03 11:20:29 -0700:
2013-09-03 11:20:29 -0700:

External Hard Drive doesn't mount, not showing in Disk Utility

I have had this Western Digital external hard drive for a few months now and until this evening it worked fine. It won't show up on my Macbook Pro and it is not present in the Disk Utility section. The light on the external hard drive is on so it doesn't appear to be a power issue. I have another of the same exact hard drive and it works fine. I tried switching USB cables and even power supplies and I can't get it to work. Does anyone know how to recover the files or is the hard drive toast?

Something's wrong inside the case; it's either a problem which is preventing the computer from properly connecting to the drive or the drive itself is dead.
Data recovery from a failed drive can only be done by a professional service, which can charge hundreds or thousands of dollars.
(93717)

External Hard Drive showing in Disk Utility - but not desktop.

A little background:
Yesterday, I moved my shelf where I have my modem, Airport Extreme, Airport Express and an external HD connected to the extreme to be a wireless HD for all users to access. Everything worked great - no problems whatsoever.
Problem: I have reconnected everything exactly as it was and reconfigured it as it was and now the external HD is having issues. When connected to the extreme, I can see it in the airport utility, but cannot gain access to it in that way. When I connect directly to my macbook, it is recognized by the disk utility, but does not appear on the desktop.
I don't know if this may have caused the problem, but I carelessly, unplugged the power bar for which all the above mentioned hardware plugs into when moving the shelf. Now, everything works as it did, except I can't get the express to show up once it is configured (but this isn't surprising as I had to fight with it the first time I configured it - not uncommon I am told), and the HD is no longer accessible via the network, or when directly connected to my macbook.
Help! According to the utilities, the data is still on the disk, I just can't access it in any way.

From the Disk Utility, select the drive and click on the Repair Disk(not Repair Permissions) button. If the Disk Utility finds a problem it can't fix, DiskWarrior or TechTool Pro will likely succeed.
(24355)

External hard drives not showing in disk utility

When I connect a new Eagle/Consus W-Series external hard drive enclosure to my 15" PB, the hard drive doesn't show-up in the left hand pane of the Disk Utility window. The only thing that shows is the drive in the PB. The hard drive in the enclosure is a WD SATA and is connected via USB cable. The same thing happens, or doesn't happen, when I'm connected via ethernet to my G5 2.3GHz Dual Core: when I open Disk Utility on the PB, the drive on the G5 doesn't show. What I'm trying to attempt is to mirror/clone Tiger from my PB onto the new, to me, G5 using SuperDuper.

Hi, Bob. I obviously didn't understand the situation properly, and now that I realize that, I'm afraid I still don't.
When the G5 is connected, via ethernet to my PB, the hard drive does not show-up in the PB's disk utility pane.
The G5 doesn't have a hard drive in it now, is that correct? So why connect it via Ethernet to the Powerbook?
If you're trying to clone the Powerbook's hard drive onto the G5's drive inside the external enclosure, all that needs to be connected is the external enclosure to the Powerbook, via USB cable. The G5 itself isn't involved in that process at all. When the G5's drive is in the enclosure and connected to the Powerbook, does it appear in Disk Utility on the Powerbook? If not, see my previous suggestions, with the exception of my comment about it not working with either computer.
If the SATA hard drive doesn't appear on the Powerbook's desktop or in Disk Utility when it is in the G5 and the computers are properly networked via Ethernet, recheck your sharing settings: the G5's drive must be shared to be visible to the Powerbook. In that mode, you may not be able to clone the Powerbook's drive to the other one, because the drive in the G5 is being used to run the G5. But if the G5's drive is partitioned, you should be able to clone the Powerbook's drive, via Ethernet, to a partition other than the one which contains the OS that's running the G5.
While the hard drive is in the external enclosure, I can hear it spinning, and am assuming that all the connections are working properly.
If the drive spins, you can be sure it's getting power, and that's good. But you can't safely conclude from that that any or all of the data connections are working properly; in fact the evidence suggests the contrary.
In short, there may be not one but two problems at work here: incorrect sharing settings when the two computers are networked, and a bad cable, connection, or enclosure when the drive is connected to the Powerbook via USB.
EDIT: Let me also add that if the only Tiger installer discs you have are the ones that came with the Powerbook, then having copies of that Tiger installation on both of your computers would be a violation of the software license that accompanied those discs, which entitles you to have Tiger installed on only one computer at a time. If that's the case, you should really buy a retail Tiger installer disc to use on the G5.
Message was edited by: eww

My Macbook Pro mid 2012 is not reading/connecting to my (working)external hard disk(also not showing in disk utility)

I connected my 500GB Storjet external hard drive to my mac(Mountain Lion) http://in.transcend-info.com/products/Catlist.asp?modno=325 but it is not connecting to it. Disk Utility is also not showing it. and the hard disk is working... My PS3, My Sony TV and my other laptop(win7) is detecting it... Also whenever it gets connected a blue light blinks, but It doesnt for mac. I have tried reformatting to both FAT32 and NTFS... Please help..
Also I sorta screwed my Mac so I had to do the internet recovery thing and only after that such problems occured, it was working fine before. So it installed Lion first and then Mountain Lion. It wasn't working on any of the OS.

Power down the Mac, Full power off. Connect the drive using the Y cable and then turn the Mac back on.
If it still doesn't show in at least Disk Utility then start checking your USB ports to see if both are working properly. Just plug in a USB thumb drive and that should show in both Finder and Disk Utility. If one of the ports isn't seeing the thumb drive then that port is bad and the system needs to be services by Apple.

Mac-formatted external HD only access with Disk Utility

Hello!
I read a lot about problems with Mavericks and WD harddrives. But i did not found anything about my problem:
- bought a new HD and formatted with Disk Utility
- copied all important data to it, all fine
- next day for my surprise i couldn´t see this HD in Finder
- looked in Disk Utility and the HD is there
- if i click on the drive and "open" then i can see it in finder and have access to all data, but if i click on "reveal in finder" i can´t see it!
- i started CarbonCopyCloner and did a complete backup to a new second backup HD, CCC recognized the HD and everything worked fine
- now the backup HD has the same problem, i can see it only in Disk Utility
- it seems that the error moved from one drive to the other, so my guess is it has nothing to do with brands or a hardware failure
- i´m searching now for hours but i don´t find a solution
- i now have one (very important) data HD and a backup HD as a clone with the same problem
- all other HD´s i have are showing correctly in finder!
Does anyone have any ideas?

After hours of searching this is the solution:
Open Terminal, then
defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder
sudo chflags nohidden /Volumes/"Name Of Drive"
killall Finder
defaults write com.apple.finder AppleShowAllFiles FALSE
killall Finder
This thread helped me:
http://forums.macrumors.com/showthread.php?t=209905&highlight=drive&page=4

Partition Tab not showing in Disk Utility

Hello again everyone,
I'm attempting to partition my LaCie 2TB (RAID1) Disk in Disk Utility, however the partition tab is not showing up..
There are 4 items visible in the Disk Utility window:
1) the Internal OS Disk
2) the LaCie 2TB (RAID1) Disk
3) & 4) the two slices/partitions of the LaCie mirrored RAID
I select the 2TB LaCie RAID1 Disk, however it only shows the "First Aid" & "RAID" tabs.
The "Partition" (as well as "Erase" & "Restore") tabs are not available or shown.
When I select the Internal OS Disk all the Tabs are shown, and when the 2 slices or partitions of the RAID1 are selected it shows the "First Aid, Erase, Partition, Restore" tabs..
Am I missing a step here?? I know I'm not supposed to select the slices/partitions of the RAID, but instead to select the LaCie 2TB Disk itself, however this is the only option which does not show any "Partition" Tab..
Any assistance is GREATLY APPRECIATED.. Thank you!

Have you tried this:
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 two. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
I'm sort of confused as to why you would partition a 3 GB drive into just a single 1 TB partition, but that's what I understood you to say. Is this 3 TB drive installed in an enclosure that actually supports a drive of that size? Older enclosures may not and should not be used.

New HDD not showing in disk utility

Help please!
i can up on a broken G5 i have replaced the HDD. now i am trying to install tiger. but the new internal HDD is not showing up in disk utility.
i plugged my passport in and it popped right up.
some one please let me know what you think.

Well, having a had hard drive connected may cause a grey screen (if the system cannot successfully perform a check of connected devices). Not sure about the fan.
If you have not done so yet, be sure to try resetting PRAM
http://support.apple.com/kb/HT1379
If that does not help, you can also try resetting the SMU (power management).
http://support.apple.com/kb/HT1767
Follow the procedure precisely.
It is also possible that the old drive was not bad and your iMac has some other problem. Did you ever test the previous drive on another Mac (or connected externally) to confirm it was faulty? That +other problem+ may be what you are experiencing now.
Also, I asked this previously but, are you able to start up the iMac using the optical drive, with a Mac OS X installation disc in there?

Macbook Pro won't start/HD not showing in Disk Utility

Hello, this problem is probably detailed elsewhere but i'm not finding anything that seems to fit. Thanks in advance for the help. My 2010 era Macbook Pro w/Maverick isn't starting up beyond the gray screen. I tried resetting PRAM and starting up with the install disc to run disk utility, but none of the actions to verify, repair, etc were available. Restarted and now the drive doesn't show up at all. Any suggestions?
I'm hoping to at least get it started so I can run Time Machine again -- been traveling and haven't updated in several weeks.
Thanks, -Tess

Tess,
since you have Mavericks installed, you can try this: boot your MacBook Pro into Recovery mode by holding down a Command key and the R key as it starts up. Once the OS X Utilities menu appears, select Disk Utility. On the left-hand side of the Disk Utility window, is your internal disk’s boot partition (typically called “Macintosh HD”) shown? If so, select it. On the right-hand side, press the Verify Disk button if it’s not greyed out; if it is greyed out, or if it reports that errors were found, press the Repair Disk button. Once the verification/repair is completed, exit Disk Utility and select Restart from the Apple menu to restart in normal mode.
When you’d run Disk Utility from your grey installation DVD, did it show your internal drive on the left-hand side of the Disk Utility window?

Hard drive not showing in Disk Utility?

Recently, I went to install Windows 10 via Bootcamp and set up two partitions (one for OS X, 500gb and one for Windows, 500gb). I accidentally installed Windows onto of the OS X partition and somehow the Windows OS disappeared so I currently have no OS to boot in to. I can run Yosemite off of a USB, but when I go to Internet Recovery or Disk Utility, it only shows this.
Disk Description : Media
Total Capacity : 0 Bytes
Connection Bus : SATA
Write Status : Read/Write
Connection Type : Internal
S.M.A.R.T. Status : Not Supported
Partition Map Scheme : Unformatted
I know the hard drive can't be dead because this is a brand new laptop and it was working just fine before. How can I get the drive fixed?
Instead of buying DiskWarrior since it's $110, can I just buy a new 1TB HDD and put it into the computer? Can I hook up my laptop via Firewire to my iMac and reformat the drive or something?

OGELTHORPE wrote:
Or try and boot the MBP with the OPTION + COMMAND + R keys. The display should show a revolving globe. By following the instructions, this will connect the MBP to the Apple servers and allow you to erase the HDD and reinstall the ORIGINAL OSX.
Ciao.
The problem with this option is that the computer does not recognize that there is any space on the hard drive itself. The hard drive is just labeled as "Media" and has 0 bytes available. I tried using GUID partitions but Disk Utility says the drive is too small.

Non-formatted External Harddrive not showing in Disk Utility

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