My external hard drive suddenly not recognized (retina macbook pro)

Windows 8 has a great feature which is "windows to go", so I have installed windows 8 in my external hard drive. The problem just happened. I was using windows via my hard drive. I shut down the computer and turned on mac system.  Then the hard drive wasn't detected!
I have tried doing following things but didn't work:
I plugged out and plugged in the the external hard drive again.
I restarted the mac system.
I put my charger on.
I opened the console and here are the "Message"...:
1/18/14 8:53:51.000 AM kernel[0]: USBMSC Identifier (non-unique): 012345678933 0x152d 0x539 0x1302, 3
1/18/14 8:53:52.000 AM kernel[0]: MacAuthEvent en0   Auth result for: 10:bf:48:3d:cb:03 Auth request tx failed
1/18/14 8:54:39.000 AM kernel[0]: MacAuthEvent en0   Auth result for: 10:bf:48:3d:cb:03 Auth request tx failed
1/18/14 8:57:13.000 AM kernel[0]: MacAuthEvent en0   Auth result for: 10:bf:48:3d:cb:03 Auth request tx failed
PLEASE HELP ME!

It is formatted for both PC and Mac
I have tried finding it in Disk Utility, no dice...
Tried both USB Ports
And a reboot is still unsuccessful..

Similar Messages

  • External Hard Drive suddenly not recognized

    I have a WD 500GB external hard drive that I use to back up my data. I only have one hard drive as I'm currently living abroad and couldn't bring a 2nd with me.
    I plugged in my external last night to back up my MacBook Pro and it backed everything up. I even went into Time Machine to go back and restore a file or two and that worked without problem. I have been using this drive for about a year to back up everything on my Mac and, although sensitive, it seems to work okay.
    I plugged it in this morning and nothing. My Mac will not recognize that the drive is not plugged in in Time Machine or in Finder. If I go to Apple Logo > About This Mac > More Info... > Storage tab, it just shows my internal hard drive and my CD/DVD drive. If I click on Disk Utility with the drive plugged in, it shows my Hard Drive (Macintosh HD) with two icons, one inset below the other and both in black font, and then my external hard drive has two underneath, but only the top one is black font - the one underneath is greyed out.
    It goes like this:
    250.06 GB Hitachi...
         Macintosh HD
    500.08 GB WD My Passport
         Time Machine Backups (greyed out)
    Superdrive (greyed out)
    When I clicked on the 500GB one and told it to repair/verify it said the disk was working fine. I tried unplugging and replugging in the drive (it is not recognized in Finder so I could not properly eject the disk). I restarted my Mac with it unplugged and plugged it in afterward and nothing.
    The HD itself is working, the light is blinking (not solid) and I can feel the hard drive spinning, but I'm at a loss as to what to do to get my Mac to recognize it again.
    Any suggestions would be helpful.
    Thank you!

    I also wanted to add, when I click on the greyed out Time Machine hard drive that's listed and then click "Info", this is what it says:
    Name : Time Machine Backups
    Type :           Partition
              Disk Identifier :           disk1s2
              Mount Point :           Not mounted
              File System :           Mac OS Extended (Journaled)
              Connection Bus :           USB
              Device Tree :           IODeviceTree:/PCI0@0/EHC2@6,1
              Writable :           Yes
              Universal Unique Identifier :           56EF6088-FFCE-300B-81D7-3E0986532AB5
              Capacity :           499.74 GB (499,735,552,000 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

  • Portable External Hard-drive is not recognised on Macbook Pro after latest update

    Recently my Seagate Portable hard-drive is no longer recognised in Finder, disk utility or the system profile. It no longer sufficiently powers the device as no light appears but the external hard-drive does make a noise. The device still works with other macs.
    So far I have tried turning it off and on and have consulted my local apple store with no luck.

    Do other peripherals work when connected to the MBP?
    Try a NVRAM reset:
    http://support.apple.com/en-us/HT204063
    Ciao.

  • My external hard drive is not recognized by my computer.

    My external hard drive is not recognized by my computer. I used it earlier and it was fine however my computer froze and I unplugged my hard drive without properly ejecting it. Now when I plug it in nothing pops up. I've tried on three different computers and no luck. I hope this is fixable! Please help.

    Care to share which OS you are using?
    Repair permissions & restart your computer.
    Zap the PRAM

  • Setting up an external hard drive to back up my MacBook Pro?

    I am currently using a 320GB Western Digital external hard drive to back up my MacBook Pro using Time Machine, soon however I am going to be putting Windows 7 onto my machine so I am trying to figure out how I am going to back up the Mac OS X and the Windows partition at the same time using this hard drive. I am thinking about completetly erasing the drive and putting 2 partitions on it in 2 different formats (one for Mac OS X and one for Windows). I am also thinking of using Carbon Copy Cloner instead of Time Machine because it creates bootable backups. However, now that I am thinking about using Carbon Copy Cloner I am wondering if FAT32 will work for both partitions? (I have been using Mac OS X extended (journaled) only because it works with Time machine). I need help though because I would not know how to go about completely erasing/resetting the drive etc.. then partitioning it and formatting it. I am also wondering if there is a windows equivalent of CCC or Super Duper to back up the Windows partition. Thanks for your help in advance.

    I'm inferring from the way you wrote about using Windows that you plan on using it through Boot Camp.  Have you considered using VMware Fusion (or Parallels) instead?  Then Time Machine would back up the virtual machine along with everything else.  You also have the advantage that you can use both Mac OS and Windows at the same time - you don't have to choose one or the other.  There are two disadvantages.  First, since both Mac OS and Windows are running simultaneously, you need more memory.  I'd recommend no less than 8 GB if you run any serious software on either OS.  You can get away with 4 GB, but at times the system will be really slow.  Second, the virtual machine images are BIG - mine typically run over 20 GB - so you'll probably want a bigger backup drive if you go this way.

  • How do i transfer music from an external hard drive to itunes on my macbook pro?

    how do i transfer music from an external hard drive to itunes on my macbook pro?

    easy just open iTunes and Finder together and drag the songs into iTunes
    George Karakadas, hope this helped u. if it helped u PLZ RATE MY AANSWER AS: "CORRECT ANSWRER" thnx

  • The external hard drive is not recognized by my macbook pro (yosemite).

    The external hard drive that was recognized by my older iMac (snow lion), is not recognized by my new macbook pro (yosemite).
    Can anyone help me with this? Thank you!

    Can you see the drive in Disk Utility?
    See mount section in 1st linked article.
    Disk Unmount Using Terminal
    Disk Utility – Force Mount Disk

  • External hard drive is not recognized in Migration Assistantt

    I had my hard drive replaced on my iMac, Mac OS 10.4.11, Snow Leopard.
    I backup my computer using Time Machine onto an external hard drive.
    In Migration Assistant, the external hard drive does not show up. There are no choices to choose to migrate from.
    Any suggestions please!

    See Pondini's TM FAQs, for starters.

  • External Hard drive will not mount on Macbook Air (mid-2011) OSX 10.9.4

    Hello Everyone!
    Needs some help resolving this issue.  External hard drive (Toshiba v63600-C) will not mount anymore on my mothers-in-law's macbook air.  She notice this problem starting on the Aug 6th.  You can see it in the Disk Utility but is not mounted.  I can get the her ext hard drive to mount on my Macbook Pro with no problem.  I also tried my personal ext hard drive (Seagate) on her Macbook Air and it will not mount.  Not sure what is going on here.  Any help is appreciated in resolving this issue.
    Disk Utility
      Mount Point : Not mounted  Capacity : 1 TB (1,000,096,367,104 Bytes)
      Format : Windows NT Filesystem (Tuxera NTFS)  Available : -
      Owners Enabled : -  Used : -
      Number of Folders : -  Number of Files : -
    Actions Taken So Far:
    1) Confirmed "external disk" is selected under Finder's Preference
    2) Reset PRAM
    3) Ran Verify Disk and Repair Disk under Disk Utility with no change.
    4) Tried manually mounting disk in Disk Utility but get "Mount Failed" error

    You may believe this is Apple's problem but I just like Baltwo have had absolutely no problems with any of my Firewire drives in Lion. So unless you can come up with much stronger evidence to the contrary, I doubt that your feeling are going to carry any weight at all.
    Allan

  • How do you separate corrupt files from good files on a external hard drive importing them to my macbook pro

    how do you separate corrupt files from good files on a external hard drive importing them to your macbook pro

    You open them one at a time into thier respective programs and see if they are good or not and then send the bad ones to the Trash and the good ones to the appropriate folder.

  • External Hard Disk SUDDENLY NOT RECOGNIZED!

    The mac is suddenly no longer recognizing my external hard drive. I have called apple support, but the only solution they suggest is for me to bring it into an Apple store for a repair... Unfortunately I don-t have the time right now to go to an apple sotre, and I was wondering if any of you out there had a solution,
    ISSUE: External Drive (Buffalo Ministation 1TB) no longer recognized by mac.
    INFORMATION/TESTS:
    - PRAM AND SMC rests were done, but this made no change.
    - Safe boot and login with another account didnt change anything
    - Disk doesnt appear on disk utility
    - Did another update of OS X 10.8.2
    - The external drive works fine on other macs and PCs so the external drive it self is fine.
    - All the USB ports are fully funcitional with other USB sticks and External hard drives.
    PROBLEM:
    I believe and so does the apple care, that the computer is no longer supplying sufficient power to the external drive in order for it to run.
    Does anyone know a fix?
    OR, is it possible that a hard disk, which has both USB 2.0 and 3.0 capabilities, suddenly stops working on USB 3.0 ports but continues working on a USB 2.0 port? I have no other USB3.0 ports in my hands in order to test the device!
    Thanx for your help!

    I'm guessing it's connected via USB, however, if connected via firewire I'll include the following links.
    USB and FireWire Quick Assist
    http://support.apple.com/kb/HT1151?viewlocale=en_US
    What to do if your computer won't recognize a FireWire device
    http://docs.info.apple.com/article.html?artnum=88338
    Dealing with FireWire problems (drives not mounting, devices unrecognized, etc.)
    http://www.macfixit.com/article.php?story=20041221081432908
    Common fixes for USB device issues (unrecognized, etc.)
    http://www.macfixit.com/article.php?story=20070824012114701
     Cheers, Tom

  • External Hard Nrive Suddenly Not Recognized...

    I've had my 200GB Western Digital external hard drive for almost two years. About 3 days ago it suddenly wasn't recognized by my Macbook. It's disappeared from Finder, it's not in Disk Utility, and I don't know how to fix it. It powers up when I plug it into the USB drive, but none of the 170GB of music files that I store on it can be found by iTunes.
    I'm convinced that I'm basically screwed.
    Someone please tell me that I'm wrong.

    I'm guessing it's connected via USB, however, if connected via firewire I'll include the following links.
    USB and FireWire Quick Assist
    http://support.apple.com/kb/HT1151?viewlocale=en_US
    What to do if your computer won't recognize a FireWire device
    http://docs.info.apple.com/article.html?artnum=88338
    Dealing with FireWire problems (drives not mounting, devices unrecognized, etc.)
    http://www.macfixit.com/article.php?story=20041221081432908
    Common fixes for USB device issues (unrecognized, etc.)
    http://www.macfixit.com/article.php?story=20070824012114701
     Cheers, Tom

  • External hard drive is not recognized after attempt to format

    I just got a new macbook and couldn't use my external hard drive because it was formatted on a PC and only allowed me to read the data. I backed up the data on the 250gb hd and then used Disk Utility to erase the hd and format it as "Mac OS extended (journaled)." After beginning, Disk Utility stopped working and showed up as "not responding" in the Activity Monitor.
    Now the hd does not show up on the desktop and can only be seen in Disk Utility. If I try to erase again or partition the hd the utility stops responding. If I try to zero out the drive it continues to say "preparing to zero" indefinately. Now the hd is also not recognized by windows except in the windows disk utility, but it does not even give the option of formatting/initializing it, so that is not an option.
    Has anyone ever seen anything like this before, or have any idea of something that I haven't tried yet. I really want to get the drive working and have exhausted all the ideas I can come up with. The internet has not provided too many ideas either.
    Thanks so much for your help.
    Black MacBook   Mac OS X (10.4.6)  

    I have crazy solution to format it to FAT 32, it work a couple times on my several MAxtor, and Western Digital HD. But this is the last resort and if you are not handy and familiar, don't do it.
    It happen on my external HD, so I crack the enclosure open, pulled the HD out and attached it as internal HD on a PC after adjusting the jumper to master and make sure no other HD attached to the motherboard. Make sure the motherboard detected (you can see it from bios menu).
    Insert a bootable installer disk before XP ('98, ME, or 2000), and start from there until a promt comes, and type fdisk and you delete the old partition and create a new partition and restart once using the disk still and format it using FAT 32.
    After that you put it back to the enclosure, and mount it to MacBook as a new HD with default factory format.
    If you don't have the installer disk, this might help :
    http://www.bootdisk.com/
    But if your maxtor still under warranty better talk to them first and they might willing to reformat it for you.
    Hope this help your external back and let you use it on your MacBook.

  • My external hard drive is not recognized

    I have the apple external disk drive.  I have used it numerous times.  I just plugged it in and the computer is not recognizing it.  I have tried both USB ports.  How can I fix this?

    A: USB desktop or 2.5" port powered?
    B: did you just install mavericks
    C:  DOES IT show in disk utility?
    Can you confirm it on another Mac?
    Apple doesnt make HD, what HD is it marked as?
    Likely its a dead SATA bridge card, a very very common problem with USB and external HD
    see here:
    Your dead external hard drive is likely fine! Great hope for your 'faulty' external HD
    report back with more info

  • Music from External Hard Drive suddenly not playing...

    The other day I disconnected my external hard drive to use it elsewhere, plugged it back in later, then suddenly none of my songs located on it could be played on itunes...
    Funny thing is that if I right click and go "show in windows explorer" it takes me to the correct directory on the external...however when I go to play the song the small speaker icon appears next to it, however without the "sound waves" that appear when a song is playing....
    Can anyone help me out???
    Thanks

    If you have relocated the media folder to an external drive and then start iTunes with the drive disconnected iTunes will reset the media folder to the default location on the internal drive. It will also assume that all files on the drive are "not present". Correct the location of the iTunes Media folder, then close iTunes, wait a few moments and open it again. iTunes should now find your files.
    tt2

Maybe you are looking for