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.

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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.

HT4847 I can not delete old icloud back up from my old phone, keep receiving an error message "this back up can not be deleted because it's in use" it is not in use that phone is long gone!

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I have the same problem here and it wont let me do another back up or delete the old one.... Please help!!!! Anyone

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   4. iPad Support
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          Tap Settings > General > Software Update
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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
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HT5554 I have the iPhone 5 and I keep getting a no sim card message. I have had my phone for over a year now so I know I have a sim card. How can I fix this because it doesn't let me get calls now.

I have the iPhone 5 and I keep getting a no sim card message. I have had my phone for over a year now so I know I have a sim card. How can I fix this because it doesn't let me get calls now.

Try resetting the phone. Hold the home and power lock button until the Apple logo appears.If that does not work, turn the phone off and take the SIM out and then put it back in.
If that still does not work, you may have a defective SIM, in which case you will need a new one from your carrier.

Can't Install Mountain Lion - Disc doesn't use GUID. How will i make it work?

Hey.
I just bought and downloaded Mountain Lion,
but when i try to install it on my Macintosh HD, it says that the Disc doesn't use GUID.
How will i make it work?

I'll explain a bit what is going on so you will understand.
Storage and boot drives have instructions at the begining that tell firmware and hardware what partitions are on the drive and their format, among other things.
This is called a Partition Table or Map, and there are different types. One is GUID (GPT) that Mac's and OS X uses now to boot from and Master Boot Record (MBR) that is used with older Windows XP PC's and files drives today come with.
Somehow your Partition Table got changed from GUID to MBR, how this occured is unknown but you have been able to use the computer and OS X until today.
To change the Partition Table requires all data on the drive to be removed as basically the map is going to be changed so the parittions (even if one) on the drive is going to lost it's "map".
Despite what Disk Utility tells you, you have two partitions on the 10.6 boot drive, a hidden EFI partition also exists. (and in 10.7/10.8 there is yet another called Recovery)
So EFI is going bye bye along with the OS X partition, however you can clone the OS X partition to another drive either using Kappy's method, or Carbon Copy Cloner or SuperDuper.
So you first need to format a powered, blank extenral drive using Disk Uility (select the drive makers name and disk size on teh far left) with a Partition > Options GUID and Format OS X Extended Journaled, quit, then use CCC to clone the OS X Macintosh partition to the extenral drive.
Once this is completed you can hold the option key down to boot from this external drive and check it out. You also should make a drag and drop copy of your files to yet another drive as a extra safety net. Disconnect this last drive.
Now what you want to do is while booted from the clone is use Disk Uility to format the INTERNAL drive the same way you did the clone drive, with a GUID and OS X Extended Journaled.
Now use CCC to clone the external drive to the internal drive, while option key booted from the external drive. When that's finished you need to change the name of the external drive to something else preferablly.
When your done, disconnect the drives and reboot, set the Startup Disk in System Preferences to the internal drive.
If you get a flashing question mark upon boot, hold the option key down and select the drive to boot from then repeat the above step.
Now you should have a GUID partition table and ready to upgrade to 10.8.

"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

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 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.
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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.

Itunes error says phone can't be updated because it doesn't have ITunes 11.1 or later

Ever since updating to ioS 7.0.2, I am getting an error message that says my phone cannot be used because it has an older version of Itunes. How do I fix this? I don't see a place to update just the Itunes software. Thanks in advance for your help!

Hi hannijin,
What version of the Mac OS X do you have on your computer? The version of iTunes that you can install is dependent on the operating system that you have. For example, the current version of iTunes requires OS X version 10.7.5 or later.
Finding the OS X version and build information on your Mac - Apple Support
https://support.apple.com/en-us/HT201260
Apple - OS X Yosemite - How to Upgrade
https://www.apple.com/osx/how-to-upgrade/
Hope that helps ...
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They wouldn't be security questions if they could be bypassed without Apple verifying your identity.
(114579)

How can I create my own tag name while creating a partition table.

I have X4500 running Solaris 10. I have formatted a disk and created partition table as given below.
Specify disk (enter its number): 0
selecting c0t0d0
[disk formatted]
/dev/dsk/c0t0d0s0 is part of active ZFS pool zpool1. Please see zpool(1M).
FORMAT MENU:
disk - select a disk
type - select (define) a disk type
partition - select (define) a partition table
current - describe the current disk
format - format and analyze the disk
fdisk - run the fdisk program
repair - repair a defective sector
label - write label to the disk
analyze - surface analysis
defect - defect list management
backup - search for backup labels
verify - read and display labels
inquiry - show vendor, product and revision
volname - set 8-character volume name
!<cmd> - execute <cmd>, then return
quit
format> partition
PARTITION MENU:
0 - change `0' partition
1 - change `1' partition
2 - change `2' partition
3 - change `3' partition
4 - change `4' partition
5 - change `5' partition
6 - change `6' partition
select - select a predefined table
modify - modify a predefined partition table
name - name the current table
print - display the current table
label - write partition map and label to the disk
!<cmd> - execute <cmd>, then return
quit
partition> print
Current partition table (original):
Total disk sectors available: 1953508749 + 16384 (reserved sectors)
Part Tag Flag First Sector Size Last Sector
0 usr wm 34 4.00GB 8388641
1 usr wm 8388642 2.00GB 12582945
2 usr wm 12582946 200.00GB 432013345
3 usr wm 432013346 175.00GB 799014945
4 usr wm 1166180386 375.43GB 1953508748
5 usr wm 799014946 175.00GB 1166016545
6 usr wm 1166016546 80.00MB 1166180385
8 reserved wm 1953508749 8.00MB 1953525132
partition>
I am unable to specify my own tag name. How can I change the tag name to one of my interest.
I need to create 3 partitions as told below
partitions:
/earth
/mars
/work
/earth and /work should be roughly equal in size, /mars should be twice the size of the others, if that is possible. If not 3 partitions of equal size will do.
Please, help me .
Thank you.

Exactly 1TB? Slightly under/slightly over?
Traditional Solaris disk labels are in VTOC format, but this format cannot describe disks larger than 1TB. So EFI labels must be used on disks larger than 1TB. Setup is slightly different.
Are these physical disks or LUNs from a SAN array? If they are array LUNS, it is often the case that they don't have a Sun label of any type. So...
#1 Apply a Solaris label
If the LUNS don't have a label (when selected in 'format', it gives a warning that no label is present and offers to apply a label immediately). When run non-interactively, format assumes "yes" for any questions. So all you'd have to do is select every disk to have it apply labels to any unlabled disk. Run 'format' once and find the highest number (maybe it's 50 for you). Create a text file that looks like this:
disk 1
disk 2
disk 3
disk 50Then feed that to format like this:
# format -f /tmp/disklist or whatever you've named the file.
#2 Apply the partition layout to all disks you want.
You asked if you should do the same procedure, but I don't see that you've actually done anything above other than print out the existing layout. Take one of your 48 drives and partition it the way you want manually (set the slices to the sizes that you want). Then you can copy the layout of that disk to others. You only want to do this between disks/LUNs of the same size. As an example, if you've explicitly partitioned c1t0d0 and you want to apply this to c1t1d0, do this:
# prtvtoc /dev/rdsk/c1t0d0s2 | fmthard -s - /dev/rdsk/c1t1d0s2Repeat for all of your other disks.
Darren

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

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