Change Apple Parition Map to GUID Partition Table?

Hi,
My external My Passport Studio hard drive is currently formatted using the Apple Partition Map. It works fine with Time Machine, but would it work better if I changed it to the GUID Partition Table?

Not necessarily. You can use either partitioning scheme. You won't have some of the features of GUID such as repartitioning on the fly, but that's probably not essential.

Similar Messages

  • GUID partition table/Apple Partition Map

    Hello,
    I just bought recently a Seagate FreeAgent Go for Mac and I'm planning on using it with Time Machine. My question is the following: since the Seagate is partitioned following the GUID partition table, and my mac's internal HD is partitioned according to the Apple Partition Map; would that affect in any way the backups?
    Thx!

    From http://developer.apple.com/documentation/Darwin/Reference/ManPages/man8/diskutil .8.html
    the +APMFormat specifies that an Apple Partition Map scheme should be used. This is the traditional Apple partitioning scheme used to start up a PowerPC-based Macintosh computer, to use the disk as a non-startup disk with any Mac, or to create a multiplatform compatible startup disk+.
    For more on GPT, see:
    http://developer.apple.com/technotes/tn2006/tn2166.html
    http://db.tidbits.com/article/8405 and
    http://www.macfixit.com/article.php?story=20060721104222189

  • HT5225 "This disc does not use the GUID Partition Table Scheme...". I keep getting this message when I try to install OSXLion. It has something to do with a repair Apple performed last year. I use a 17" MacBookPro. Any suggestions?

    "This disc does not use the GUID Partition Table Scheme. Use Disc Utility to change the partition scheme". I keep getting this message when I try to install OSX Lion so that I can upgrade my 17" MacBookPro to move to iCloud. My harddrive was replaced last year by Apple because of a fault by the manufacturer and I think this is the cause of the problem. What can I do so that I don't lose my content.

    When you click the partion tab. There is option on the bottom of the window. Click on that there there are these options.

  • How do I change the partition scheme to use GUID partition Table.

    How do I change the partition scheme to use GUID partition Table so I can get Snow Leopard to download on my 10.5 disk.
    When I insert the disk it asks me to select  the disk where you want to install MAC OS X.It only give me one option the 10.5.
    when I click on it it says...
    "10.5" can't be used because it doesn't use the GUID Partition Table scheme.
    Use Disk Utility to change the partition scheme.  Select the disk, choose the Partition tab, select the Volume Scheme and then click Options. 
    I tried to do what it says and I can not find what it is saying.  This is the info about my MacBook.
    Model Name: MacBook
      Model Identifier: MacBook4,1
      Processor Name: Intel Core 2 Duo
      Processor Speed: 2.4 GHz
      Number Of Processors: 1
      Total Number Of Cores: 2
      L2 Cache: 3 MB
      Memory: 4 GB
      Bus Speed: 800 MHz
      Boot ROM Version: MB41.00C1.B00
      SMC Version (system): 1.31f0
    Thank you for your help!

    The GUID partition option is one of three possible choices (click the "Options" button in the Partition") menu - be careful to have a full backup as changing the partition scheme will force an erasure on the disk. Take a look at this Apple support article for more complete information:
    Firmware updates for Intel-based Macs require a GUID partition scheme - Apple Support
    Ignore the stuff about firmware updates and just look at the changing GUID partition scheme.
    Good luck - and don't forget about the full backup BEFORE making this sort of change.

  • "GUID partition table scheme"  Can't install snow leopard on my mbp.

    I have a mbp that is partitioned as half mac, half XP.  I put in the snow leopard CD and came up with an error that said I could not istall snow leopard because my partition did not fit the "GUID partition table scheme".  I followed the menues to the partition section of the disk utility.  From there, I don't know what to do.  I can't click on the "options" button to change to the GUILD thing.  Do I need to repartition my entire mbp?  Will this erase my other partition?  And will it delete all my data?  Any suggestions on what to do???

    GUID partition table (GPT) or map is a set of instructions at the very begining of a storage drive to tell the hardware what partitions and formats are where on the drive.
    A Intel Mac now requires a GPT to boot OS X as it uses EFI (Extensible Firmware Interface) which is a software firmware in a hidden EFI partition on the boot drive designed originally for copy protection by Intel. EFI loads into memory before OS X  does, which can be seen if you have verbose mode activated upon boot time.
    Setting up the boot drive with a GUID Partiton table WILL require backing up of all data off the machine and a complete erasure of ALL partitions on the drive, which includes ALL data, programs, operating systems and files not backed up off the machine previously.
    Since a partition map is basically road directions, when it's destroyed so does go the partitions.
    Also since you will be fresh installing 10.6, your free iLife won't tag along,, however you can erase/install 10.5 first then upgrade to 10.6 (no BootCamp) and that shoudl work.
    Unfortunatly Mac's only now support Windows 7 in Bootcamp, however Windows 7 Pro (and above) will run XP programs natively or via free virtual machine XP downloaded from Microsoft, however since it's really not native, 3D games etc likely won't run very well.
    If your not familiar or willing to take a chance, then I suggest you have someone else upgrade that machine.
    https://discussions.apple.com/community/notebooks/macbook_pro?view=documents

  • IMac HD can't be used because it doesn't use GUID partition Table

    Trying to install Snow Leopard... Really need some help here... The instructions given by the installation program simply don't work!!!!
    They state "Use the disk Utility to change the partition scheme. Select the disk, choose the partition tab, select the Volume Scheme and then click Options."
    Volume Scheme is grayed out under partition tab which means I can not change it...
    Why have Apple not made this public that software can not be installed all machines? A very very poor show!!! I am extremely disappointed! Why do you guys not properly test your software and provide all the necessary tools to do the job automatically.. It seems to me the software has been rushed out with out proper testing.
    Please provide me with the next steps... or details of how I get a refund?
    Bets regards,
    David
    Message was edited by: Dave O - UK
    Message was edited by: Dave O - UK

    All Intel iMac that had Leopard installed using a Mac OS X installation disc (or had it pre-installed already when purchased new) should have an internal drive with partition map scheme of +GUID Partition Table+. If will work if partition map scheme is +Apple Partition Map+ (which is native to PowerPC Macs), but Installer would have insist that it is +GUID Partition Table+ (if the Leopard installation was done using an Intel Mac).
    How was Leopard installed on your iMac? You can check the current +Partition Map Scheme+ by selecting the drive in Disk Utility's sidebar and looking at the bottom of the window.
    Why have Apple not made this public that software can not be installed all machines?
    Apple has release software that can be installed on all supported machine, where Leopard came pre-installed or was installed properly using a Mac OS X installation disc (run on an Intel Mac).
    Volume Scheme is grayed out under partition tab which means I can not change it...
    You can't re-partition the drive if you are currently started up from that drive. Insert the Snow Leopard disc. Restart with the C key held down to force startup from the optical drive. At the first Installer screen, to up to the menu bar and look under Utilities. Run Disk Utility from there.
    NOTE: If you re-partition your internal drive to change the +Partition Map Scheme+, it will be erased. Be sure to have a back up of at least your personal data before doing the next step. If you want a procedure where you can retain the internal drive data and change the +Partition Map Scheme+, please post back; you will need an external hard drive that is at least as large as the data on your internal drive.
    In Disk Utility, select your Internal DRIVE in the sidebar. Go to the Partition tab. You will now be able to reset the +Volume Scheme+, so set it to *1 Partition*. Click the Options button, and set it to *GUID Partition Table*. Name the volume ("Macintosh HD" is the standard name for the internal drive volume) and set the volume format to *Mac OS Extended (Journaled)*. When you Apply the change, the drive will be erased. It should take less than one minute.

  • This disk doesn't use the GUID Partition table scheme.

    When I Install the Lion. It is stuck.
    Lion This disk doesn’t use the GUID Partition table scheme.Use disk Utility to change the partition scheme.Select the disk,choose the Partition tab,select the Volume Scheme and then click Options.
    The last step has problem.
    I can not click Options.

    In order to repartition the startup drive you will have to boot from your Snow Leopard DVD, select Utilities and then Disk Utility.  YOU MUST ERASE YOUR DISK TO CHANGE THE PARTITION TABLE.  The good news is that I see you have a Time Machine backup.  Make sure that your backup is current before you erase your startup disk.
    Even before doing this, save a copy of the Lion installer (it is in the Applications folder) onto an external device.  Your external hard drive is a good spot; it won't interfere with your Time Machine backup. This will prevent you from having to download the installer again.
    The easiest way to proceed after making sure your Time Machine backup is current, saving a copy of the Lion installer, and repartitioning your startup disk, is to reinstall Snow Leopard on your newly partitioned disk. This will take a little longer but it is simple and is fully supported by Apple.  Once that is done and you are running Snow Leopard on your startup disk again, run the Lion installer from whereever you saved it, and then restore your files and settings from your Time Machine backup during the install process.
    There is an unsupported procedure for making a bootable Lion DVD, but it is more complex and is not supported by Apple.  If you are uncomfortable with any of this and have access to an Apple Store, make an appointment at the Genius Bar and they can help you through the process.

  • Lion This disk doesn't use the GUID partition table scheme

    Hi I have downloaded and began running the installation but it says "This disk doesn't use the GUID partition table scheme", any ideas?! Running latest version of OSX 10.6.8
    Thanks in advance!

    ok, sorry if I offended you for wrong.
    I did not knew Apple ships MBR partitioned disks or has official support for doing so. I always see Windows-PCs with that scheme ( Linux supports mbr and guid just like osx ) .
    Of course I know that Disk Utility offers three options : GUID or MBR or Apple partition map for ppc devices.
    Lion needs GUID, so a reformat is absolutely necessary for those that have one of the others.
    Again sorry.

  • "A GUID Partition Table (GPT) partitioning scheme is required."

    Hi.
    Im trying to encrypt an external HDD and it says "A GUID Partition Table (GPT) partitioning scheme is required."
    Im aware HDD needs a MAC OS Plus (Journaled), I have check disk Information and its formated as MAC OS Plus (Journaled), so why its keep saying to a GPT Partion scheme is required)
    Any idea on how to overcome this?
    Thanks!

    Issue was with partition map, it was Apple instead GUID as listed in diskutil list

  • I want to install OS X Mavericks on my MacBook Pro which is not with guid partition table

    i want to install OS X Mavericks on my MacBook Pro which had both mountain lion & windows 8.1, its not in GUID partition table format, so i couldnt install mavericks, so is there any way to change into GUID partition table format & install Mavericks  without losing Windows from my hard disk ?

    Open the App Store and upgrade iPhoto to the Mavericks version.
    iWork and iLife for Mac come free with every new Mac purchase. Existing users running Mavericks can update their apps for free from the Mac App Store℠. iWork and iLife for iOS are available for free from the App Store℠ for any new device running iOS 7, and are also available as free updates for existing users. GarageBand for Mac and iOS are free for all OS X Mavericks and iOS 7 users. Additional GarageBand instruments and sounds are available for a one-time in-app purchase of $4.99 for each platform.
    The iWork apps are free with a new iOS device since 1 SEP 2013. They are free with a new Mac since 1 OCT 2013. They are also free with the upgrade to OS X Mavericks 10.9 if you had the previous version installed when you upgraded.

  • Guid partition table scheme

    I get this message that says that but cant read the rest its says use the disk utitlity to change....
    Cant read the rest. Can someone help me?

    Are you trying to install Mountain Lion and get that message?
    If so, it means you have to reformat your hard drive as GUID Partition Table, which will erase all of your data. So, you need to backup your hard drive before you try.
    While somewhat old, this seems to be a good tutorial on reformatting and partitioning: http://www.kenstone.net/fcp_homepage/partitioning_tiger.html
    Here is a more current tutorial: http://www.ehow.com/how_4779169_partition-drive-mac-os-x.html
    You'll need to boot from your Snow Leopard install disk in order to reformat startup hard drive.
    Once you reformat and install Snow Leopard on the drive, you can update to 10.6.8 and then install Mountain Lion. Once you reinstall, it will ask if you want to migrate from another Mac or Backup. Choose yes and connect the backup drive.

  • Can I use gpt to recreate/unerase a partition table? (Rebuild the GPT/GUID partition table?)  I don't want to do FILE recovery.

    (Yes, I've  googled a bunch and read threads like this one already.)
    Can I use gpt or some other app to recreate/unerase a partition table?  That is, how can I rebuild a disk's GPT/GUID partition table?)  I don't want to do FILE recovery.
    What happened: Instead of erasing a single partition off a disk with many partitions, the entire partition table was erased (using Disk Utility, w/o deleting the underlying files).  Somehow the "Erasing a disk deletes all data on all its partitions." warning message was missed.
    I have a copy of the output of df, with the number of blocks in each partition, from just prior to the erasure, so I should be able to recreate the GPT/GUID partition table.  Editing the GPT with a hex editor is not feasible.  Simply recreating the partitions with Disk Utility will overwrite the key filesystem tables on each partition, and I don't want to do that, plus Disk Utility doesn't allow me to specify exact partition sizes anyway.
    Surely there's an app for rebuilding the partition table (other than emacs' hexl-mode!) for recreating/unerasing a partition table when the partition sizes and orders are known?  I've looked at the advertising for a bunch of recovery software and none of them clearly indicate that they will do what I want. 
    I guess I can try using gpt on a copy of the reformatted drive I've made with dd, and see what happens.  But perhaps someone knows of a tool that should do what I need, or knows if gpt is that tool or not.
    There are answers and tools that will do FILE recovery - search for files and recover the ones that aren't fragmented or deleted.  As far as I can find, they just look for files on the disk, and don't pay much, if any attention to the filesystem info or directory heirarchy, which in this case is valuable.  Of course I could send it in to DriveSavers, or the like.  But none of that seems necessary, and the scavenging file recovery apps won't do the job well,
    E.g. some are mentioned here:
    I don't want to do FILE recovery.
    Thanks for any help.
    The links in this post are to pages describing the underlined term, e.g. the man pages for df and gpt.
    dd output includes:
    Filesystem
    512-blocks 
    Used Available Capacity  Mounted on

    Aperture has the ability to work with files in their existing location. They are called "referenced masters." When you import images, you should select the "In their current location" in the "Store Files:" drop down box. Have a read of the documentation for full specifics. Unsure how you can resolve your duplication; might be some work but next time have a read of the manual first
    Information for versions is stored in the Aperture database (library file). The masters can be inside the library file itself, or they can be somewhere else.

  • FAT32 Partitions on GUID Partition Table External Drive Not Seen in Vista

    I have an interesting predicament. I have repartitioned my external hard drive to have 5 partitions: 2 HFS+ and 3 FAT32. The external drive has a GUID Partition Table. The drive was formatted and partitioned using Disk Utility.
    When I boot into Windows Vista using Boot Camp, Vista will ONLY mount the first Windows compatible partition. For example, if I have two partitions disk2s2 and disk2s3 (both FAT32), Vista only mounts disk2s2.
    The described partition setup worked well with Master Boot Record, minus the bug with Time Machine choking every so often.
    Any ideas on how I can get Vista to recognize these partitions?

    Hi Karl87,
    according to the german computer magazine c't there is a limitation/flaw in the Master Boot Record (MBR:
    Only the first four partitions are shown in the MBR and since one of these entrys is taken by the needed hidden EFI-partition and the next two entrys are taken by the OSX partition, there is only one of your three FAT partitions shown.
    This limitation to four partition entries is quite old.
    See here for further informations: http://en.wikipedia.org/wiki/Masterbootrecord
    To my knowledge there is no solution for this.
    Regards
    Stefan

  • How do I get my mac partition to use GUID partition Table Scheme?

    I just bought the upgrade for Mountain Lion on my Macbook pro (Mac OS X 10.6.8). I went to install it and i had partitioned my internal harddrive with bootcamp to run windows 7. I went to select the Macintosh partition and it says that disk does not use the GUID partition Table scheme, and it will not let me select it for the upgrade. It says I have to use Disk Utility but I cant seem to figure out how to get it so I can upgrade it to mountain lion. Please help and thank you for your time
    P.S. - Let me know if you need more information to get to the conclusion to this problem.

    Bonjour is built-in to OS X. No download is needed.
    Safari has a Bonjour browser which you can activate by opening Safari Preferences, selecting Advanced and enabling one of the Bonjour entries to add a Bookmark. If you then select the Bookmark, all devices on your local network that are advertising themselves with Bonjour will be shown.
    With regards to the Air not finding the printer attached via USB, you can open System Information and select USB in the left column. The top right pane will show all the USB busses on the Air and if the printer and its USB cable are working correctly, then the printer should be listed under one of the USB busses. Do you see it? If not, try another USB printer cable.

  • FW HD Needs Repartitioning as "GUID Partition Table" to Install Leopard ?

    I have the latest iMac and the latest LaCie Quadra HD which is currently split into 2 equal partitions which are formatted as Mac OS Extended (Journaled).
    I want to install a bootable version of Leopard on the LaCie so I started up with the first iMac Install DVD.
    The 2 partitions of the LaCie appeared with a red exclamation mark indicating they could not be used.
    There was additional info stating that in order to use the LaCie it would have to be repartitioned in Disk Utility using the "GUID Partition Table".
    Needless to say I aborted the installation and came here for help.
    What is it all about ?

    I wanted to "repair" my new iMac because the DW directory graph showed more than 30% of the items out of order!
    If I wasn't used to DW I would have been worried as it sounds appalling but 2 years previous experience with a G3 iMac and a G4 eMac show that this is perfectly normal.
    DW paints this frightening scenario yet Disk Utility passes the HD as perfectly OK and the actual performance experienced is fine.
    On rebuilding the directories I have never noticed any improvement on what was already good performance !

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