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USB falsh drive not recognised

Discussion in 'OS X Mountain Lion (10.8)' started by Chirson, Apr 29, 2013.

  1. macrumors newbie

    Hi All,

    My Macbook Pro early 2011 (OSX 10.8.3) does not recognize one of my USB flash drives, it is not shown on desktop nor in Disk Utility. Flash drive is USB 2.0 and works fine under Win7, it is formatted in FAT32. Both USB ports also work fine as I can use them with my other USB drives and devices (iphones, cameras, etc.). The only problem is with this specific USB flash drive. Is there a way to add a driver for this specific flash drive? How do you tackle a problem like this in OSX, I am clueless, and searching the net was not of much help either. Any suggestions how to solve this problem are welcomed.

  2. macrumors 68020

    Does the drive not work in both USB ports?

    Is the drive listed in System Profile? (Apple menu > About This Mac > More Info > System Report > USB.)

    If all else fails, try another flash drive.
  3. macrumors newbie

    Hi benwiggy

    Thanks for your reply, the flash drive doesn't work with both usb ports and it is not shown in the system profiler but then other usb drives are not shown either when they are connected. This is what I get from system profiler:

    USB Hi-Speed Bus:

    Host Controller Location: Built-in USB
    Host Controller Driver: AppleUSBEHCI
    PCI Device ID: 0x1c2d
    PCI Revision ID: 0x0005
    PCI Vendor ID: 0x8086
    Bus Number: 0xfa


    Product ID: 0x2513
    Vendor ID: 0x0424 (SMSC)
    Version: b.b3
    Speed: Up to 480 Mb/sec
    Location ID: 0xfa100000 / 3
    Current Available (mA): 500
    Current Required (mA): 2

    Apple Internal Keyboard / Trackpad:

    Product ID: 0x0245
    Vendor ID: 0x05ac (Apple Inc.)
    Version: 1.08
    Speed: Up to 12 Mb/sec
    Manufacturer: Apple Inc.
    Location ID: 0xfa120000 / 5
    Current Available (mA): 500
    Current Required (mA): 40

    BRCM2070 Hub:

    Product ID: 0x4500
    Vendor ID: 0x0a5c (Broadcom Corp.)
    Version: 1.00
    Speed: Up to 12 Mb/sec
    Manufacturer: Apple Inc.
    Location ID: 0xfa110000 / 4
    Current Available (mA): 500
    Current Required (mA): 94

    Bluetooth USB Host Controller:

    Product ID: 0x821a
    Vendor ID: 0x05ac (Apple Inc.)
    Version: 0.41
    Speed: Up to 12 Mb/sec
    Manufacturer: Apple Inc.
    Location ID: 0xfa113000 / 6
    Current Available (mA): 500
    Current Required (mA): 0

    FaceTime HD Camera (Built-in):

    Product ID: 0x8509
    Vendor ID: 0x05ac (Apple Inc.)
    Version: 5.16
    Serial Number: CC2B2C0AR3DGFKL0
    Speed: Up to 480 Mb/sec
    Manufacturer: Apple Inc.
    Location ID: 0xfa200000 / 2
    Current Available (mA): 500
    Current Required (mA): 500

    The only place where my USB drives are shown in system profiler is under Storage. Here is an example of USB drive that actually works:

    4GB DRIVE:

    Available: 4.19 GB (4,185,735,168 bytes)
    Capacity: 4.19 GB (4,192,202,752 bytes)
    Mount Point: /Volumes/4GB DRIVE
    File System: MS-DOS FAT32
    Writable: Yes
    Ignore Ownership: Yes
    BSD Name: disk1s1
    Physical Drive:
    Media Name: CHIPSBNK USB 2.0 Media
    Protocol: USB
    Internal: No
    Partition Map Type: MBR (Master Boot Record)
    S.M.A.R.T. Status: Not Supported

    The drive in question is not shown in storage section when plugged in. It is not a problem to get another drive that works, I have several of them and I'll be fine :) It just bothers me that there is nothing I can do to solve this problem :( and it seems that both USB drive and laptop work fine but somehow they can't work together.
  4. macrumors 6502a

    I have a flash drive that just will not work on my MBA, but works fine on my other computers.
  5. macrumors 6502a

    Try restarting your computer. If that doesn't work, then create a test user account and login to that to see if it shows up there.
  6. macrumors newbie


    Done already, no show :(
  7. macrumors 65816


    You don't need to install a driver for a flash drive. OS X should recognize it automatically. You can try erasing and reformatting your flash drive by plugging it in (even if you can't see it on your computer) and opening disk utility. Then you can click on the USB and erase and format the disk (probably as FAT if you need to use it with a PC as well) Just make sure you back it up first.


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