OS X :: External Hard Drive Not Recognized - Unknown Device
Jan 31, 2010
Another one of those "external hard drive not recognized" problems: I am using a Mac Mini. The external LaCie drive is in one of those beautiful boxes designed by a guy named Porsche. It's connected via Fire Wire. I have my iPhoto library stored on it. It was working just fine for the past two days after I first connected it.
Now it does not show on the Desktop. It is identified only as "Unknown device" in "About This Mac." iPhoto doesn't recognize it. I've looked at the other threads on this subject here and have reset the PRAM. Disk Utility recognized it for a while and said the disk was OK. Now Disk Utility does not recognize it at all.
I turned off the drive and turned it back on. That resulted in an alarming series of beeps, almost like somebody was sending the Morse code symbol for "E" over and over again. I turned the drive off and then on again. Now the light goes on and the drive whirs nicely. I am using System 10.6.2. Or rather, at this point it is using me.
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Oct 9, 2007
I am a photographer. I use 4 X 1TB LaCie external hard drives to store my digital images. 2 as masters for different business segments and 2 as their back-ups. They are daisy-chained using Firewire 800. Recently my G5 has stopped recognizing one of the drives. Is there any way to get my machine to re-recognize the missing drive? I have rewired the four drives to see if there was a problem with the cabling, but this does not appear to be the case. I am coming up to the 1 year warranty period on this drive and need to get it back to LaCie if there is no other solution.
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Nov 1, 2008
I've got an external hard drive. It's a "My BooK" Western Digital 500 Gb that uses both USB and Firewire. I've used it many times successfully with my MacBook but today, my Macbook will not recognize it.
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Apr 9, 2012
my new MacBook Pro not recognizing my hard drives. Yes, thats two hard drives I have that don't seem to work on this computer but both work on my older MacBook and many other computers.
Info:
MacBook, Mac OS X (10.5.8)
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Apr 11, 2012
I recently invested in a refurbished iMac which is running Mac OS X Lion 10.7.3 (11D2001).
I am trying to access my existing external hard drive through the machine and although this lights up when plugged in, it doesn't appear in the finder. Other Memory sticks work without problem.
It is a Western Digital Elements 160GB Portable Hard Drive that has worked and continues to do so without problem on my ancient iBook G4.
Info:
iMac (21.5-inch Mid 2011), Mac OS X (10.7.3)
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Jun 1, 2014
I have used a Samsung HX 1Tb external hard drive under OSX Snow Leopard with absolutely no problem. Since I upgraded to the free (improved?!?) OSX Mavericks my Macbook Pro cannot "see" my hard drive. All I get when I plug it in is the following message -
my MacBook thinks that the hard drive is formatted for windows - but why should it work OK under Snow Leopard but not with Mavericks? I don't want to simply reformat the external drive because I'll lose all the files stored on it.Is there suitable software/Apps that I can use to let my Mac access this external hard drive.Incidentally my partners new Macbook Air can still read this hard drive.
Info:
MacBook Pro (15-inch Mid 2010), OS X Mavericks (10.9.3)
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Sep 19, 2010
My WD firewire 800 drive has stopped working, I can hear it spinning when I plug it in but the light doesn't come on and my computer doesn't recognize it. I've tried both the firewire and usb connections.
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Jan 20, 2009
I have two external hard drives, one 250GB for my Time Machine, and one 500GB for other stuff. I had accidently formatted my 500GB to use for Time Machine, but realized, I didn't need that much storage, so reverted to the 250GB for Time Machine and the 500GB for storage. But it seems, in the formatting stage (for Time Machine), it set my file system for the 500GB to Mac OS Journaled. I can see this hard drive on the Mac, but it does not recognize it in Windows (although I hear the USB plug in sound, doesn't show up in "My Computer"). Does this have to do with the formatting? If so, how can I format it so that the external hard drives can be read by both Mac OS X and Windows? Does it require moving my data (before formatting?)?
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Feb 20, 2012
I have a new seagate 500gb hard-drive, it is recognized on Disk Utilities and not only that it also says the hard drive is 2tb.
Info:
MacBook Pro
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Mar 21, 2012
I am trying to pull up my Western Digital External Hard drive after connecting it via USB. I used to be able to open it through Finder and there is nothing showing up.
Info:MacBook Air, Mac OS X (10.7.3)
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May 31, 2012
I just installed a new internal hard drive into my macbook as my old one was failing. Before doing this I backed up all of my information through Time Machine onto a Seagate FreeAgent external hard drive. I've been using this external hard drive for the past two years and I've never had any problems with my macbook mounting it. Once I had all of my personal information backed up I took out the external hard drive and then proceeded to take out my old internal hard drive and installed the new one. I installed the Mac operating system and the Macbook started up just fine but when it came time to reload all of my personal setting using Time Machine my macbook didn't recognize that there was an external drive plugged in. I know it isn't the external drive as it mounts just fine on other laptops. how I can get my macbook to mount the drive so that I can transfer all of my information onto this new internal drive?
Info:
MacBook, Mac OS X (10.5.8), Seagate FreeAgent
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Nov 27, 2009
I know how to change the name of a partition. But I want to change the name of the actual device I want to change that. Any ideas?
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Jun 23, 2014
i have Macbook Pro 2011 8GB RAM, 1 TB Hard drive OSX Mavrick. i recently ejected my back up drive but it was not a properly ejected now when i plug in the computer it doesnt come up as hard drive. it shows up in the disk utlity but it doesnt open its my backup drive and i dont want to loose m data
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Aug 23, 2014
My G drive External Hard disk is not recognised by windows laptops yet it works on my MacBook Air
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Sep 8, 2014
So I plug my external hard drive into my IMac via a usb port, the drive turns on but the drive never appears on my desktop. How do I access my external hard drive when it is not recognized automatically?
Info:
iMac, OS X Mountain Lion (10.8.5)
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Aug 7, 2009
On my Rev. C. Before I installed it, my fan kicked in only when I had a external device attached, hard disk drive, optical drive, etc. Now it runs more often. Not a big deal, but thought worth mentioning.
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May 30, 2012
when I connect my Garmin Edge 705 to the MacBook Pro (Mac OS X 10.7.4) the device won't mount as USB-drive instead it just goes into charging mode. This wasn't the case earlier with the MacBook Pro (>10.7.3) and this isn't the case with a MacBook running still on Snow Leopard.
Therefore I assume that something has changed in the Mac OS X 10.7.4 particularly in the Finder?
Info:
MacBook Pro, Mac OS X (10.7.4), MacBook, Mac OS X (10.6.8)
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Jun 14, 2012
I'm using a 500GB WD external hard drive to store a lot of data. It's been working fine, plugged into a USB hub. Suddenly, today, the drive stopped appearing when I plugged it in. I've tried plugging it in directly to the computer, it doesn't help. In system profiler, the USB port shows up as : Vendor Specific Device. The ID is confirmed as being from Initio, so I was rather dismayed. Upon trying the drive with another computer, same thing. The drive just shows up as an Initio device, not my external drive. I've rebooted and changed cables many times.
MBP 2010, Core2Duo.
OSX 10.6.8
Info:
MacBook Pro, Mac OS X (10.6.8)
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Sep 9, 2009
I know this is going to be an incredibly easy fix, but I can't find it. The Hard Drive on my new iMac is not appearing on my desktop, nor is it appearing in the "Device" menu in Finder.
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Jul 20, 2009
I've just got a new external HD, but it's not being recognised by Mac OS X (10.5.7). I assumed it was because it was in a Windows format, so booted Windows, but it then turned out it wasn't formatted at all. What is the easiest way to make this an HFS+ (the Mac OS extended format), and how do I do it as I can't see it anywhere on the Mac (including Disk Utility)?
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Jun 5, 2014
Why did the Mavericks install create two shared user folders on my hard drive ('brw0080929854c2' and 'netgear106ebe') ? What should I do with these, delete or are they essential ?
Info:
iMac, OS X Mavericks (10.9.3)
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Jan 18, 2010
Just booted up a new 27" iMac and only have my Magic Mouse and wired keyboard connected. Went to the Bluetooth preferences and it shows "Apple Mouse" as connected. And then it shows another item 90-84-9j- etc. listed as not connected. The info about it reads as follows.
Type - Unknown
Services - None
Paired - Yes
Configured - Yes
Favorite - No
Connected - No
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Apr 16, 2009
I have tried troubleshooting, searching this forum, & googling to no avail. I'm hoping someone smarter than me can figure this out.
Short Version:
Purchased this hard drive:
[URL]
and purchased this external enclosure:
[URL]
when I plug it into my macbook, PC, or a powerbook, the disk is not recgonized, I can not get Disk Utility to even recognize that the hard drive exists. I thought it may be a bad drive, so I sent it in to Seagate Warrenty, they sent me a new one and I'm still having the same problem. Does anyone know how I can format the drive or any way I can get it to be recognized?
Longer Version:
My powerbook crashed, so I purchased this HD to replace it. I installed the 1st seagate and when i went to install OSX and said select destination drive, there was none there to select. I was able to repair the original HD so I reinstalled it and went to install OSX and it DID show the drive to install it on, so I don't think that it is the computer/motherboard. Then I sent in for the 2nd seagate, tried getting it to work with the external enclosure and installing internally in the powerbook, etc. nothing seemed to work.
I am wanting to install the new drive in the powerbook as the old drive is on its last leg (but currently works). Every thread i have searched for that was similar, there was no solution that I could use.
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Dec 28, 2009
I plugged in my hard drive into my Macbook Pro and it wouldn't show up on the desktop. Opened the finder, and it wasn't there either. I went into the disk utility and it was there. So then I thought maybe rebooting the computer would help. Then I plugged it into my friend's Macbook and it showed up no problem. The last time I used it I remember that error appearing where it forces you to shut off the computer. Does that have anything to do with it? I do photography and I have my entire collection on this hard drive, so restoring it is not an option. Like I said, the device was recognized and worked fine on my friend's laptop, just not on mine.
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Mar 20, 2010
I've had a 1TB external drive (Samsung Story) working wonderfully as a Time Machine backup for the last month. It had been unplugged for the last couple days, but I plugged it in today to do a back-up. Unfortunately, it wasn't recognized. It stills lights up and makes noises so I don't think it's dead, but no matter which USB port I put I use or how many times I restart, my MacBook won't recognize it anymore.
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May 8, 2010
Just a few seconds ago, my WD Mybook external HD wasn't recognised. The sign came up saying that you should eject your drives before disconnecting them (although I didn't disconnect it). So I unplug it and try to plug it back in and it isn't recognised. The hard drive is powered (I can hear it spinning), I tried switching firewire cables, I tried it with another computer, and it isn't recognised
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Mar 8, 2012
I've been having several problems with my mid-2009 MacBook Pro; 2 minute beachballs and failure to startup. So I've purchased a new new WD Scorpio Black thinking it was a HD issue, but after replacing my old HD with the WD, Disk Utility wouldn't recognize the new drive. So I searched around and found out that Hard Drive Cable failure is an issue on this certain MacBook. So I ordered a new Hard Drive cable and just replaced that today, thinking that my new HD would be recognized. However after going into Disk Utility via the OS X Install DVD, my new Hard Drive was still not recognized.
Info:MacBookPro
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May 27, 2012
Have a mid 2009 13" 2.26 dual core. Started getting flashing folder with question mark icon and found hard drive failed. Tried two different drives, WD Scorpio Black 750GB 3GB/s 7200rpm and Seagate 500GB 3GB/s 7200rpm. Neither is recognized by the computer. What next? And yes I have the updated firmware.
Info:
MacBook
Pro, Mac OS X (10.6.5)
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Dec 27, 2006
I'm having some troubles with an external enclosure and my sister's new imac. The enclosure I'm using is a Tao Tec 2500 (2.5" drive) IDE --> USB device with the Y-cable. The drive has been formatted to NTFS and has some files on it. As far as I can tell though the version of OSX the new imac is running should support read capability with the file system though. The computer is a latest generation imac (purchased about 12/20/2006) and running a new revision of OSX (about 1.0.4.7 I believe). My problem seems to be the computer simply does not recognize the drive. Disk utility doesn't see it nor the usb manager in system tools. The LED indicator on the drive indicates that it's receiving power and I've tried swapping the usb ports around just to be sure I don't have a bumed port. It simply seems like OSX just doesn't know the drive's there.
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Jul 7, 2009
I have a first gen white macbook core duo. I am trying to install a new 320GB Seagate HDD in my laptop to replace the 60Gb drive. I installed it but I can't get the OS to recognize the Hard disk when it is installed in the computer. I have no problems when it is installed in an external case. I have booted off the Leopard disk but it does not show a drive available to format, I booted off the original drive in the external case and the disk utilities does not show another drive attached. If I put the 320GB drive in the external enclosure, disk utilities recognizes it right away. I have formatted it with GUID format but it doesn't work when installed directly in the macbook.
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