Previous 1 2 3 Next 30 Replies Latest reply: Jun 6, 2012 8:20 PM by poflynn
poflynn Level 4 Level 4 (1,300 points)

In Disk Utility, when I format and partition an 8GB flash drive it starts out saying an 8GB partion will be created. 

When it's done, it reads:

 

Size: 7.66 GB (not unusual)

Available space: 2.26 GB

 

The blue area of the box is only part way filled in.  When I resize the thing up to the blue, so that the Available space reads Zero KB, the Size then reads 5.4 GB, exactly the difference between 7.66 and 2.26.

 

What does that mean? There's nothing on the drive. I did an Erase and tried again, but same thing.

 

I'm confused.


iMac7,1 2.4 GHz; 2GB, Mac OS X (10.4.11), Tiger iLife '08 Alesis IO|14 FW Interface
  • Kappy Level 10 Level 10 (255,930 points)

    That's simply because the 8 GBs is really 8,000,000,000 bytes (Base 10) while the 7.66 GBs is the size using Base 2 - 1024^3 bytes. The blue area is simply the estimate of how much space will be used by the OS when it's installed. Simply ignore it.

  • poflynn Level 4 Level 4 (1,300 points)

    That much I understand. But why does it then read 2.26 GB available? That adds up to way more than 8. And why does it let me resize to 5.4 GB with Zero remaining?

  • poflynn Level 4 Level 4 (1,300 points)

    Further, I then tried to copy a .dmg of 4.18 GB using Restore and it wouldn't take.

  • Allan Eckert Level 8 Level 8 (47,205 points)

    How is the drive formatted?

     

    Allan

  • Kappy Level 10 Level 10 (255,930 points)

    Because it assumes that part of the disk is reserved for OS X meaning you only have the 2.26 GBs for other storage.

     

    If the disk is empty you shouldn't have any problem copying a file to it. You shouldn't have a problem cloning a disc image using Restore. I don't know what you are doing that prevents you from doing either unless you actually have created more than one partition on the disk.

  • poflynn Level 4 Level 4 (1,300 points)

    Okay, I'm going to try the Restore process again.

    It's definitely only one partition.

    I'm doing this following instructions in the Lion Missing Manual, creating a bootable start up with the InstallESD.dmg file from within the package contents of the Lion Install app before I upgrade from Snow Leopard.

  • poflynn Level 4 Level 4 (1,300 points)

    Allan Eckert wrote:

     

    How is the drive formatted?

     

    Allan

    Mac OS X Extended (Journaled)

  • poflynn Level 4 Level 4 (1,300 points)

    I've started the process again and it already seems to be going better; it's estimating 28 mins; first time was 3 hrs!

  • Kappy Level 10 Level 10 (255,930 points)

    Do this. Forget the missing manual. I've done this routine many times, and I know it works. Be sure that your USB flash drive is properly prepped:

     

    Make Your Own Lion Installer

     

    1. After downloading Lion you must first save the Install Mac OS X Lion application. After Lion downloads DO NOT click on the Install button. Go to your Applications folder and make a copy of the Lion installer. Move the copy into your Downloads folder. Now you can click on the Install button. You must do this because the installer deletes itself automatically when it finishes installing Lion.

     

    2. Get a USB flash drive that is at least 8 GBs. Prep this flash drive as follows:

     

    1. Open Disk Utility in your Utilities folder.
    2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
    3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
    4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
    5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
    6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.

     

    3. Locate the saved Lion installer in your Downloads folder. CTRL- or RIGHT-click on the installer and select Show Package Contents from the contextual menu. Double-click on the Contents folder to open it. Double-click on the SharedSupport folder. In this folder you will see a disc image named InstallESD.dmg.

     

    4. Plug in your freshly prepared USB flash drive. You are going to clone the InstallESD.dmg disc image to the flash drive as follows:

     

    1. Open Disk Utility.
    2. Select the USB flash drive from the left side list.
    3. Click on the Restore tab in the DU main window.
    4. Check the box labeled Erase destination.
    5. Select the USB flash drive volume from the left side list and drag it to the Destination entry field.
    6. Drag the InstallESD.dmg disc image file into the Source entry field.
    7. Double-check you got it right, then click on the Restore button.

     

    When the clone is completed you have a fully bootable Lion installer that  you can use without having to re-download Lion.

  • Kappy Level 10 Level 10 (255,930 points)

    That's about typical of the time needed.

  • poflynn Level 4 Level 4 (1,300 points)

    This is essentially the same instructions in the Missing Manual, except instead of saving a copy first they have you do it before installing Lion.

     

    One thing, however. In the first part of the instructions above, it says to erase and partition your hard drive!?! Shoudn't that be the flash drive?

  • poflynn Level 4 Level 4 (1,300 points)

    Well, got the same result. It said it could not restore, can not allocate memory.

  • Kappy Level 10 Level 10 (255,930 points)

    Sorry, what's the context of this error?

  • Kappy Level 10 Level 10 (255,930 points)

    Yes, but it can be done on any drive.

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