"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

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GUID Partition Scheme - Need clean install: can I restore files from TM?

So, here's my problem. I have an Intel PowerMac (first series after the G5) and when I try to install SL I get the following error message: "Can't Install Snow Leopard Since Disk Does Not Use GUID Partition Scheme". I guess it's something related to the fact thet I previously upgraded from an old iMac with a PPC processor (Apple partition vs. GUID partition).
Anyway, accoding to my understanding, the only solution for me is to do a clean install by wiping the HD and re-partitioning it.
Now, my question is: can I use my current TM backup to later restore apps/prefs onto the new SL system? I believe that TM now has an Apple partition scheme that reflects the one I have on Leopard 10.5. Is that right? Will I encounter any problem because of the different partition type of TM?

"Anyway, accoding to my understanding, the only solution for me is to do a clean install by wiping the HD and re-partitioning it."
Right, except that your drive will automatically be erased when you set up the GUID partitiion.
"Now, my question is: can I use my current TM backup to later restore apps/prefs onto the new SL system? I believe that TM now has an Apple partition scheme that reflects the one I have on Leopard 10.5. Is that right? Will I encounter any problem because of the different partition type of TM?"
Your TM backup should work. But, there are not many guarantees in life. You could tranfer you TM backup temporarily to your internal and then make a bootable clone of your internal on your external. Afterwards, you could transfer the TM backup back. Then, you'd have two sources from which you could restore items.
Message was edited by: donv (The Ghost)

Can't format SSD to GUID Partition Scheme

I can't format my SSD to GUID Partition Scheme with Mac OS Extended(Journaled) but Master Boot works fine. When i try, it stucks even i tried Recovery HD. You can see issue in picture. What should i do?
MBP Mid 2012 OS X Yosemite 10.10.2
SSD is Samsung SSD 840 EVO

c_arslan wrote:
Toshiba is the current boot drive. I can't use the SSD because of the format of it. So there is SSD inside without format, filesystem etc.
In that case, since the SSD likely came with an MBR Partition Map, at the beginning of your format process, did you choose the Partition button, pull down the drop-down menu under Partition Layout, and choose 1 Partition, and then, using the Options button at the bottom, select GUID?

TimeMachine Fails with PowerPC / GUID Partition Scheme / 10.5.2

Just a short question to clear something up:
I have an external drive, partitioned using the GUID partition scheme attached to my MacPro. Before the update to 10.5.2, I was also able to back up my PowerBook over the network to this disk.
After the update, I get the following console message:
2008-02-14 18:49:06 /System/Library/CoreServices/backupd[450] Error: Volume at path /Volumes/Satinav does not appear to be the correct backup volume for this computer.
2008-02-14 18:49:06 /System/Library/CoreServices/backupd[450] Backup failed with error: 18
[This article|http://docs.info.apple.com/article.html?artnum=306932] explains that Time Machine disks should be partitioned with the Apple Partition Map when used with PowerPC-based Macs. If that's so – why did the backup work before the update? Any explanations? Any solutions without having to re-partitioning the entire drive?
Message was edited by: Kaspar Manz

Repairing the Hard Drive and Permissions
Open Disk Utility in your Utilities folder. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now shutdown the computer for a couple of minutes and then restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger, and 4.1 for Leopard) and/or TechTool Pro (4.6.1 for Leopard) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

Converting ext disks to GUID partition scheme without erasing

I've got a few external hard drives that I've been using for a few years, and I just tried to encrypt them...only to be told by OS X that they need to have the GUID partition scheme. Is there a way to give them this without erasing their contents? They're big drives and close to full. Most of them are backup drives, so I'd really prefer not to erase them, nor do I want to buy a new drive just to use as a copy machine.

Unfortunately, you do need to erase the drive to partition GUID
http://support.apple.com/kb/TS1600

HT2434 does anybody know what happens if I dont update the firmware of my macbook pro (does not have a guid partition scheme))

does anybody know what happens if I dont update the firmware of my macbook pro (does not have a guid partition scheme)?

Apple will hire a high school girls clique to follow you around, make fun of you & post disparaging comments on Facebook .

Unable to change to GUID partition scheme so Snow Leopard can be installed

Upgrading from OS 10.5.8 to Snow Leopard 10.6.3 on Macbook 4.1 with Intel Core 2 Duo, 2GB RAM. Instructions state "Macintosh HD" can't be used because it does not use the GUID partition Table Scheme. Use Disk Utility to change the partition scheme. Select the disk, use the Partition Tab, select the Volume Scheme, and then select Options.
Problem: The Options button is grayed out. The Partition Map Scheme is Apple Partition Map.
Note: Macbook purchased in 2008, but the hard drive was replaced in April 2011. Hard drive Information:
Name :
TOSHIBA MK1655GSXF Media
Type :
Disk
Partition Map Scheme :
Apple Partition Map
Disk Identifier :
disk0
Media Name :
TOSHIBA MK1655GSXF Media
Media Type :
Generic
Connection Bus :
Serial ATA 2
How do I change the partition scheme to GUID?

This requires that you repartition the entire drive as follows:
Drive Preparation
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
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. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. At this point you can quit DU and return to the installer and install Snow Leopard.
If you have data you wish to save then you need to backup before doing the above.

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.

Input / Output Error when creating GUID Partition on External Drives

I've been trying to setup an install of OS X on an external device and therefore need to partition them to the GUID Partition Scheme.
I've tried it with my iPod and an External Hard Disk Drive and no matter what I do, I get the error:
Exited with Error: Input / Output Error
Thats all I get. I can partition them with either of the other two choices, but of course those wont let me boot an Intel Based Mac.
The External HDD is USB 2.0, the iPod I've tried both USB and Firewire, and have not had any luck. I know it can be done, but am not sure why I'm having this problem.
Any suggestions?

I'm having the same problem. Trying to format an external drive with the GUID scheme fails.
# diskutil eraseDisk HFS+ Test GPTFormat /dev/disk1
Started erase on disk disk1
Creating Partition Map
error writing partition map: Invalid argument (22)
Partitioning encountered error Invalid argument (22) on disk disk1
I've tried this on my Intel MacBook and on my PPC Mac Mini. Tried using a generic USB2 flash disk and also an iPod shuffle. Always the same error.
Is GUID broken on external drives?

PPC Mac restore from GUID Partition on exterior HDD?

In order to provide a bootable backup for my Intel iMac, I plan to reformat my external firewire/USB HDD (Maxtor OneTouch II) into several partitions using the GUID partition scheme. My question is whether I can use the remaining partitions on the Maxtor to do non-bootable backups of my G4 and iBook computers. With respect to my iBook, for example, if I clone its hard drive to one of the Maxtor GUID partitions, can I then, booting from the iBook installation disk, use DU to restore it back to my iBook as a fully functional system? My objective is to avoid buying a second external hard drive to support the PPC Macs.
Intel iMac, 20", 1GB Mac OS X (10.4.7)
Intel iMac, 20", 1GB Mac OS X (10.4.7)

Hi-
It's best to just get a retail version of Leopard for your PPC machine, especially since asking how to use the install discs from one machine, which are licensed to only one machine, is asking someone to tell you how to violate the EULA.

Choosing an External drive partition scheme

I have a 1 TB LaCie drive that I am currently using with a MBR partition scheme. It has two partitions: one for time machine and one for windows.
What I want is to use this drive to hold my time machine back ups in one partition for Lion, which I am about to switch to and install on the iMac internal drive, my windows stuff in one partition, and a third partition in which I would put a clone (CCC) of my current internal drive (Snow Leopard) that I could boot from when desired. This would enable me to run Lion normally from the iMac's internal drive, switch to the windows partition (holding down the option key when powering on) on occasion when I want to work in a windows only app, and using the same option key on power on trick, boot into Snow Leopard when I need to use old, apps that won't run on Lion.
For this, I assume that I should use the GUID partition scheme. Am I right? Is there a better way to accomplish my goal?
Stephen

Just a cautionary word about putting all your backups on the same drive: hard drives fail - they all do; some sooner than others....... I have several partitions on mine; however, I have three external drives, so everything is backed up x 3 (redundancy is good for backups).
Having said that, I don't run Windows, so I can't help with that part; for an external to be bootable with a Mac, yes, you need GUID partition scheme. It's also a great idea to put a bootable clone of your Snow Leopard install on one just in case - that is the easiest way to revert if a major problem arises. I've heard there are some external drives which cannot boot a Mac, so make sure yours is. And, you may want to have another partition for your new (not yet installed) Lion install...... so I think I just made you run out of available space on your external

GUID partition format not on menu

Trying to create a clone & need to format external drive in GUID. The rub is that GUID is not among the options in Disk Utility (OSX 10.4.8). How do I cut this Ghordian knot?

In Disk Utility an entire disk can be set to the GUID partition scheme by selecting the drive (not volume) in the list>Partition>Option (button) a drop down sheet will appear to select the scheme.
HTH
W1

Guid partitioning

Have a MacBook with OS X 10.6.8 and downloaded Lion.
It won't install - says "the disk does not use the GUID partition scheme"
What is the best way to fix this without loosing all my data on the hard disk drive.
Disk utility says I have "Partition map scheme: Master Boot Record"
and "Mac OS Extended (journaled)"
Thanks

Actually it is reported that even though OSX refuses to install to non-GUID partitions for Intel machines, if you clone OSX to an APM drive it will still work with an Intel Machine. What you have done sounds fine, especially if you don't think you will ever want to install OSX directly on that second drive with an Intel machine.

Is there a partition scheme for both powerpc and intel-based macs?

I need to partition a drive to back up using time machine from two different Macs: one is powerpc and one is intel but disk utility seems to only allow you to choose on or the other.
this is the disk utility option:
Select a new partition scheme:
* Use Apple Partition Map partition scheme if the disk will be used with Time Machine and a PowerPC-based Mac.
* Use GUID partition scheme if the disk will be used with Time Machine and a Intel-based Mac.

silvrmn wrote:
unfortunately i am alternating them between computers.
is there a way to make it work or is the only solution to get two different drives and format them accordingly?
TM will most likely work fine with both computers if you partition the drive GUID. that's been the experience of most people who do it. but apple does recommend partitioning the TM drive GUID for backing up intel macs and APM for PPC ones.
using GUID is unlikely to create problems but it may.
but if you want safety on this you'll need two separate drives.

"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

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

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