Formatting Usb Flash Drive For Car Stereo Mac Os X


Formatting a drive will erase all data and partitions on the disk: Connect the hard drive or USB key to the Mac Launch Disk Utility, located in Applications Utilities Locate the drive name from the left hand side of Disk Utility and click on it. Format Flash Drive Mac with Disk Utility Your Mac computer comes with a handy utility appropriately called Disk Utility, which can be used to format any storage device. Actually, if we want to format a USB flash drive under Mac OS, we should find USB flash drive formatting software at first. Here are top 5 USB flash drive formatting software tools for Mac to help in formatting, reformatting, erasing USB flash drive under OS X or macOS. Formatting a flash drive erases all data currently stored on it. If you have already saved anything on the drive, back up the data before you format the flash drive. To back up your data, insert the USB drive into the computer you used with the drive and copy the contents of the drive to the desktop or a folder on the computer.

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

What you need to create a bootable installer

  • A USB flash drive or other secondary volume, formatted as Mac OS Extended, with at least 12GB of available storage
  • A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

  • Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
    These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
  • Download: OS X El Capitan
    This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

  1. Connect the USB flash drive or other volume that you're using for the bootable installer.
  2. Open Terminal, which is in the Utilities folder of your Applications folder.
  3. Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.

Big Sur:*

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High Sierra:*

El Capitan:

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.

After typing the command:

  1. Press Return to enter the command.
  2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
  4. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
  5. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes and a gear icon labled Options.
  3. Select the volume containing the bootable installer, then click Continue.
  4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
  3. Release the Option key when you see a dark screen showing your bootable volumes.
  4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
    If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media.
  5. Choose your language, if prompted.
  6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:

  • Big Sur: /Applications/Install macOS Big
  • Catalina: /Applications/Install macOS
  • Mojave: /Applications/Install macOS
  • High Sierra: /Applications/Install macOS High
  • El Capitan: /Applications/Install OS X El

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

Since a while back, I’m using a tool to store all my passwords, website logins, program serial numbers etc. all RC4-encrypted and password-protected. Currently, the password tool (Pastor) and the data file are located on my Power Mac G5, which of course is a problem when I need to lookup a password when away from the G5, like at work for instance. Putting everything on a USB Flash Drives may be a good solution but I’m just exploring the possibility while I’m writing this, so let’s see how it goes. When formatting a USB Flash Drive (or any drive for that matter) OS X offers the following 7 choices:

  • UNIX File System
  • MS-DOS File System
  • MAC OS Standard
  • MAC OS Extended (Case-sensitive)
  • MAC OS Extended (Case-sensitive, Journaled)
  • MAC OS Extended
  • MAC OS Extended (Journaled)

and the best format to chose really depends on the intended use of the drive. If the flash drive needs to be used on a Windows PC as well, then MS-DOS FAT32 File System is the one and only option available. The same is true for UNIX, which makes UNIX-FS the obvious, best choice.

But how do all these formats compare and which one should be used, if Macs running OS X are the only computers the Flash-Drive will ever be used with?

Mac OS Extended a.k.a. HFS Plus a.k.a. HFS+ seems to have a lot of advantages over MAC OS Standard a.k.a HFS.

  • Mac OS Extended format is a hard disk format that increases the number of allocation blocks on the disk and also allows more than 65,000 files on the hard disk. However, Mac OS Extended format optimizes the storage capacity of large hard disks by decreasing the minimum size of a single file.
  • MAC OS Standard a.k.a HFS on the other hand does not support file names > 31 chars, it does not support additional meta-information used by Mac OS X, has as limit of 65k allocation blocks, and is more error-prone than HFS+.
  • Since the storage efficiency of Mac OS Extended format typically applies to 1 GB or larger volumes, Flash Drives with a capacity below 1 GB may still benefit from the MAC OS Standard format.

What about Journaling?

If journaling is turned on for a disk, Mac OS X maintains a continuous record of changes to files on the disk. If your computer stops because of a power failure or some other issue, Mac OS X uses the journal to recover the hard disk to the last acceptable state before it stopped. However, flash memory has a limit when it comes to how often a memory location can be changed and therefore, Journaling doesn’t seem to be the first choice when it comes to Flash-Drives.

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Storage Efficiency and Write Speed.

We used a Kingston 1 GB cellspacing='0' cellpadding='4'>Kingston 1 GB cellspacing='0' cellpadding='4'>Different Flash Memories / Transfer-Write SpeedTestKingston SD/1GB1st gen. iPod ShuffleDataTraveler 1 GBDataTraveler 2 GBDataTraveler 4 GBWrite-Speed large files3.91 MByte/s2.74 MByte/s4.60 MByte/s3.12 MByte/s3.90 MByte/s

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Not unexpectedly, the lowest capacity DataTraveler performed the best. The iPod Shuffle’s slow write speed on the other hand was a little surprising. Fortunately, Pastor, the Password storage tool, requires fully deployed only 8.6 MByte storage. The password file is tiny and therefore, the 1 GB DataTraveler will work just fine.

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Final Steps

As an additional level of security, the Pastor application and the data-file can be put into an encrypted disk image. OS X’s disk utility application allow us to create AES-128 encrypted disk images like so:

  • Open Disk Utility in the Applications/Utilties folder
  • Click “New Image”
  • In the “Encryption” menu, select AES-128
  • Select the size of the disk image: 10 MByte seems to be more than enough to store application and data-file
  • Enter the name and location of the image file
  • Click Create to finish
  • Final step, come up with a password (this will be needed everytime you want to open the disk image) and enter it twice

After opening the secure dmg the application and data-file can be added by simply dragging the files into the drive. Ejecting the drive will unmount it and every future attmept to mount / access the disk image will require to enter the prevously specified password.