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  1. 07-28-2011, 08:29 AM #1
    tompam is offline

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    Unhappy OS X Lion will not read external hard drives and USB flash drives
    The other day I bought the OS X Lion from the App Store and it installed successfully on my Macbook Pro. Today for the first time I connected my external hard drive to my laptop but it couldn't be detected. I also connected another of my external hard drives as well as my USB flash drives and none of them could be detected or read by my laptop after I installed Lion. Can anyone help?
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  2. 07-28-2011, 09:00 AM #2
    louishen is offline

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    Is there a file called IOUSBMassStorageClass.kext in System/Library/Extensions/
    Member of the Month September 2008 & August 2012 | Found advice useful? – use the rep system
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  3. 07-28-2011, 10:53 AM #3
    tompam is offline

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    I couldn't find it. Is it significant? Am I the only one with this problem?
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  4. 07-28-2011, 11:17 AM #4
    RavingMac is offline

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    Until Louishen gets back to you on the KEXT file, you might try having Spotlight ignore the external drives. Been doing some looking and apparently some third party software in particular causes Spotlight Indexing to hang, causing Lion to unmount the drives.
    I've always wanted to be smart, handsome and modest. But, I guess I'll have to be satisfied with two out of three . . .
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  5. 07-28-2011, 11:37 AM #5
    tompam is offline

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    I'll try this. Thanks.
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  6. 07-28-2011, 06:42 PM #6
    harryb2448 is offline

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    Works perfectly with Cruzer SanDisk Slice.

    Can't help with external drive as on a Mac Pro backup drive is installed in position two and works well.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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  7. 07-28-2011, 06:52 PM #7
    osxx is offline

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    Works great on my SanDisk Cruzer 4GB.
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  8. 07-28-2011, 06:55 PM #8
    tompam is offline

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    I tried as many brands of external hard drives and USB flash drives with the same results. None of them will mount with Lion.
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  9. 07-28-2011, 08:10 PM #9
    bobtomay is offline

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    My question would be: What do you mean by it's not mounted?

    It doesn't appear on the Desktop?

    It doesn't appear on the Sidebar in Finder?

    It doesn't appear in Disk Utility?
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.
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  10. 07-28-2011, 09:08 PM #10
    joeg679 is offline

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    Quote Originally Posted by tompam View Post
    The other day I bought the OS X Lion from the App Store and it installed successfully on my Macbook Pro. Today for the first time I connected my external hard drive to my laptop but it couldn't be detected. I also connected another of my external hard drives as well as my USB flash drives and none of them could be detected or read by my laptop after I installed Lion. Can anyone help?
    I'm having the exact same problem, did you fix yours?
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  11. 07-28-2011, 09:15 PM #11
    joeg679 is offline

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    Quote Originally Posted by tompam View Post
    The other day I bought the OS X Lion from the App Store and it installed successfully on my Macbook Pro. Today for the first time I connected my external hard drive to my laptop but it couldn't be detected. I also connected another of my external hard drives as well as my USB flash drives and none of them could be detected or read by my laptop after I installed Lion. Can anyone help?
    Ok, I left the hard drive plugged in for about 8 minutes and the computer finally recognized it. Before lion, it would see it instantly. Try leaving it plugged in for a little while
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  12. 07-28-2011, 10:10 PM #12
    randalthor is offline

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    Quote Originally Posted by joeg679 View Post
    Ok, I left the hard drive plugged in for about 8 minutes and the computer finally recognized it. Before lion, it would see it instantly. Try leaving it plugged in for a little while
    Spotlight was possibly indexing it. Shouldn't take that long to recognize the second time around. Try again now that it's been recognized once?
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  13. 07-28-2011, 10:39 PM #13
    tompam is offline

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    Quote Originally Posted by bobtomay View Post
    My question would be: What do you mean by it's not mounted?

    It doesn't appear on the Desktop?

    It doesn't appear on the Sidebar in Finder?

    It doesn't appear in Disk Utility?
    It doesn't appear on the Desktop, the Sidebar, or the Disk Utility. I'll try joeg679's suggestion of leaving the external hard drive connected to the laptop for 8 minutes or more until it appears. I hope it works.
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  14. 07-28-2011, 10:40 PM #14
    tompam is offline

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    Quote Originally Posted by joeg679 View Post
    Ok, I left the hard drive plugged in for about 8 minutes and the computer finally recognized it. Before lion, it would see it instantly. Try leaving it plugged in for a little while
    I'll try this. Thanks.
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  15. 07-28-2011, 10:44 PM #15
    dtravis7 is offline

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    Is this a new Mac? I have never had a Flash drive that would not mount unless the drive was dead. Never. My Dell refused to mount my 2GB Kingston, 2 dells in fact but it mounted instantly on my Macs at the time.

    Not sure what to say. How are these drives formatted? You say Lion is the cause. I have 6 external drives, plugged in USB2, FW400 and FW800 and all show right up on my iMac under Lion. I tried 8 Flash drives and every one shows right up.
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