To uninstall Tails from a USB stick, and use it for something else, you have to reset it.

The content of the USB stick will be lost in the operation, but an attacker might still be able to tell that Tails was installed on that USB stick using data recovery techniques unless you securely clean all the available disk space afterwards.

You might overwrite any hard disk on the computer. If at some point you are not sure about which device to choose, stop proceeding.
  1. Make sure that the USB stick that you want to reset is unplugged.

  2. 打開磁碟工具.

    在視窗左側面板上 會出現一個電腦上所有儲存設備的清單

  3. Plug the USB stick that you want to reset.

    A new device appears in the list of storage devices. This new device corresponds to the USB stick that you plugged in. Click on it.

  4. In the list of storage devices, verify that the device corresponds to the USB stick that you want to reset, its brand, its size, etc.

  5. To reset the USB stick:

    a. 在右側面板上有一個 清除 分頁 點開它並按下底部右方的 清除鍵。

    b. 在中間上方有一個 清除鍵,請點擊它。

  6. 在確認的對話視窗中,按下清除鍵以確認。

如果清除操作失敗,請試著利用文字命令操作來格式化 USB 隨身磁

Troubleshooting

Format using the command line

  1. 電腦上拔除 USB 隨身碟。

  2. Open Terminal from Applications ▸ Utilities ▸ Terminal.app.

  3. Execute the following command:

    diskutil list
    

    It returns a list of the storage devices on the system. For example:

    $ diskutil list
    /dev/disk0
      #:                     TYPE NAME         SIZE      IDENTIFIER
      0:    GUID_partition_scheme             *500.1 GB  disk0
      1:                      EFI              209.7 MB  disk0s1
      2:                Apple_HFS MacDrive     250.0 GB  disk0s2
      3:                      EFI              134.1 GB  disk0s3
      4:     Microsoft Basic Data BOOTCAMP     115.5 GB  disk0s4
    
  4. Plug the USB stick in the computer.

  5. Execute again the same command:

    diskutil list
    

    Your USB stick appears as a new device in the list. Check that its size corresponds to the size of your USB stick.

    $ diskutil list
    /dev/disk0
      #:                     TYPE NAME         SIZE      IDENTIFIER
      0:    GUID_partition_scheme             *500.1 GB  disk0
      1:                      EFI              209.7 MB  disk0s1
      2:                Apple_HFS MacDrive     250.0 GB  disk0s2
      3:                      EFI              134.1 GB  disk0s3
      4:     Microsoft Basic Data BOOTCAMP     115.5 GB  disk0s4
    /dev/disk1
      #:                     TYPE NAME         SIZE      IDENTIFIER
      0:   FDisk_partition_scheme             *8.0 GB    disk1
      1:                Apple_HFS Untitled 1   8.0 GB    disk1s1
    
  6. Take note of the device name of your USB stick. In this example, the USB stick is 8.0 GB and its device name is /dev/disk1. Yours might be different.

    If you are unsure about the device name, you should stop proceeding or you risk overwriting any hard disk on the system.

  7. Execute the following command to safely remove the USB stick. Replace [device] with the device name found in step 6.

    diskutil unmountDisk [device]
    
  8. Execute the following command to format the USB stick. Replace [device] with the device name found in step 6.

    sudo fdisk -iy [device]
    
  9. You can try to reset the USB stick again using Disk Utility from the beginning of this page.