USB Flash Drive: Trying to recover space from "erase free space" problem

Discussion in 'Mac Basics and Help' started by kaichan918, Dec 10, 2011.

  1. kaichan918 macrumors newbie

    Dec 10, 2011
    I have an 8gb flash usb drive. (recognizes 7.5gb)
    I must have stop the operation or use erase free space or something stupid. Regardless, i just want to get it back to full capacity of 7.5 gb. I think right now its only 6.2 gb. Finder shows no files inside the drive. Let me know what i need to do. I try looking at different webpages about sparseimage file or 00 written in place of my missing 1.3 gb. But i dont know how to get it back. I am new to OSX, so please help me with clear instructions. Thanks
  2. simsaladimbamba

    Nov 28, 2010
    Use Disk Utility to format it again.


    Links to guides on how to use Disk Utility, the application Mac OS X provides for managing internal and external HDD/SSDs and other storage media and its formats.


    Overview of the four major file systems (called "Formats" in Mac OS X) used on Windows and Mac OS X, compiled by GGJstudios. You can use Disk Utility to format any HDD to your liking.
    FAT32 (File Allocation Table)
    • Read/Write FAT32 from both native Windows and native Mac OS X.
    • Maximum file size: 4GB.
    • Maximum volume size: 2TB
    NTFS (Windows NT File System)
    • Read/Write NTFS from native Windows.
    • Read only NTFS from native Mac OS X
      [*]To Read/Write/Format NTFS from Mac OS X: Install NTFS-3G for Mac OS X (free)
    • Some have reported problems using Tuxera (approx 33USD).
    • Native NTFS support can be enabled in Snow Leopard, but is not advisable, due to instability.
    • AirPort Extreme (802.11n) and Time Capsule do not support NTFS
    • Maximum file size: 16 TB
    • Maximum volume size: 256TB
    HFS+ (Hierarchical File System, a.k.a. Mac OS Extended)
    • Read/Write HFS+ from native Mac OS X
    • Required for Time Machine or Carbon Copy Cloner backups of Mac internal hard drive.
    • To Read/Write HFS+ from Windows, Install MacDrive
    • To Read HFS+ (but not Write) from Windows, Install HFSExplorer
    • Maximum file size: 8EiB
    • Maximum volume size: 8EiB
    exFAT (FAT64)
    • Supported in Mac OS X only in 10.6.5 or later.
    • Not all Windows versions support exFAT. See disadvantages.
    • exFAT (Extended File Allocation Table)
    • AirPort Extreme (802.11n) and Time Capsule do not support exFAT
    • Maximum file size: 16 EiB
    • Maximum volume size: 64 ZiB


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