Feb 172013

USB flash drive can be considered as a type of removable hard drive in that data stored on this drive can be accessed by the operating system as if it were a local disk. USB drives are now a commonplace in storage industry with the increasing need for moving data to different platforms and devices. Besides being portable, these drives can provide you storage as high as 256 GB that will probably suffice to meet the needs of both consumers and business users. Similar to hard disk drives, USB drives become susceptible to corruption with time. You may find yourself in a situation where in the drive mounts in the system, but fails to open files. This may result from improper removal of the USB drive from your computer and may have resulted in a corrupted USB Flash Drive or the files being corrupted.


The problems associated with USB drives may vary depending on the user action and the platform on which they are accessed. The USB flash drives currently on the market can be readily used with a Mac OS X Mountain Lion computer. An improper usage of the drive on Mac can corrupt the file system on your USB. If the file structure gets corrupt, there is a good chance that all the files stored on your USB are rendered unreadable. Sometimes, the drive starts acting erratically, allowing a few of your files to open while blocking the rest. In some cases, you may get out of trouble by simply rebooting your Mac OS X or reinserting the drive into the USB port. However, if problems occur almost in quick succession, you should attempt to repair the file system.


Apple provides an improved version of Disk Utility with Mac OS X 10.8 Mountain Lion. Disk Utility in Mountain Lion allows you to verify the health of your hard drive and find out any potential issues with the drive. It scans B-Trees, extent files, and catalog files that are an integral part of your file system. If problems are found, it repairs the corrupt file system to resolve issues with your startup disk and other volumes. Disk Utility can be used to repair removable drives, such as USB flash drives. If you have installed OS X on the USB drive, you can also repair permissions on this drive using Mountain Lion’s Disk Utility.

To repair a corrupt USB flash drive using Apple’s Disk Utility, follow the given procedure:

  • Insert the USB drive into a USB port on your Mac machine. In a while, the USB flash drive icon shows up on your desktop.
  • Navigate to the ‘Applications/Utilities’ folder, and then click ‘Disk Utility’. The Disk Utility window appears on your screen.
  • In the left column of this window, select the USB drive. Click on the ‘First Aid’ tab in the right pane at the top. You may select the ‘Show Details’ checkbox in the middle-left corner of the Disk Utility window.
  • Click ‘Repair Disk’ button in the right pane to repair the selected drive.
  • The Disk Utility starts scanning the USB flash drive for identifying and correcting errors. Once the process is completed, quit the program.

If you have no luck with Disk Utility, you can use Stellar Phoenix Mac data recovery which is a professional USB data recovery tools. These advanced utilities perform in-depth scanning of the corrupt USB drive to recover all your seemingly lost data absolutely intact.

  • abudllah

    What if the USB icon is not in the Disk Utility?? how to fix this?