1 Reply Latest reply: Feb 24, 2012 8:44 AM by ChrisAr155
Larry Barrows Level 1 (0 points)

Purchased Toshiba part number HDTC605XL3A1 - 500Gb USB 2.0 & 3.0 external 2.5-inch self powered hard drive through Amazon. On two different MacBooks (both Core i5--1 Air and 1 Pro) we can't get the drive to show up using Disk Utility nor can we scan for it/see it with any other available tools in Lion or Snow Leopard.


Any ideas? Toshiba has stopped producing Mac specific USB drives apparently and their technical support can't get it to work. The suggest formatting it on a Windows computer with FAT32 but don't have one easily available.

MacBook Air, Mac OS X (10.7.3)
  • ChrisAr155 Level 2 (330 points)

    Hi, have you checked on System Information to make sure the Mac is actually recognizing the hardware? (type system information on spotlight and click USB on the left)


    I had a simmilar problem with a Seagate Freeagent Go drive. It showed up on the hardware list for a few secconds and then dissapeared as if I had unplugged it, meanwhile the HDD was still on and spinning. Called Seagate and they told me to do a PRAM & SMC reset, this solved the problem, although it still happens every now and then.


    Mac OS X can see NTFS formatted drives too, the only limitation is that it can not write on them (without third party add ons) so I doubt it's a formatting problem.


    I'm not sure if you are having the same problem, but you should give it a shot.


    SMC Reset


    For Portable computers that have a battery you should not remove on your own

    1. Shut down the computer.
    2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
    3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
    4. Release all the keys and the power button at the same time.
    5. Press the power button to turn on the computer. 
      : The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.


    PRAM Reset


    Resetting PRAM and NVRAM

    1. Shut down the computer.
    2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    3. Turn on the computer.
    4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
    5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    6. Release the keys.

    Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.



    Let me know how it goes.


    ps: sorry for my english, it's not my native language!