How do I partition an external HD without formatting it or deleting data on it?

I'm using OSX Lion and have an external HD, which is about 40% full. I'd like to add a partition without reformatting it or deleting data if that's possible.
Anyone know how to do this? I've opened up Disk Utility and clicked on the Partition tab and have tried to use the re-size corner to change the size of the current partition, but it is greyed out and I can't sem to get it to work.
Any thoughts on how do to this? Right now my drive is one big partition. I'd like to divide it into two partitions, again, without deleting data if I can avoid it.
Thanks!

John C Lin wrote:
I'm using OSX Lion and have an external HD, which is about 40% full. I'd like to add a partition without reformatting it or deleting data if that's possible.
Very possible. However, requires that the HD's formatted as OS X Extended, has the GUID partitioning scheme, and has journaling enabled. If those conditions are met, Disk Utility will do it.

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If you reformat the drive all data is lost.
The only way to save the data is to copy it somewhere else during the reformat.
Drag & drop will not backup things correctly.
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Hello everyone, how can I partition my external hard drive supporting mac OS in one partition and windows OS in another?

OK. Start with:
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. 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 two (2). 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.
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I have a 500 GB external hard drive that I want to set up so that half the space is for Time Machine backup and the other half as a simple flash drive that will be compatible with all types of computer operating systems?

A terrible idea. Never use a backup drive for anything but a backup drive. Get another drive for experimenting.
You can partition an external drive no differently than an internal drive.
Drive Preparation
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. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions desired from the drop down. 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. 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 Security 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.
Steps 4-6 are optional but should be used on a drive that has never been formatted before, if the format type is not Mac OS Extended, if the partition scheme has been changed, or if a different operating system (not OS X) has been installed on the drive.

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Select the main hard drive entry (topmost one.) Click on the Partition tab. Shrink the existing partition by grabbing the sizing gadget in the bottom right corner and pushing up until you free up enough space for your second partition. Be sure you do not shrink to less than the space currently occupied by your files. Click on the Add[+] button to create a new partition in the free space. Click on the Apply button and wait until the partitioning is completed.

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Assuming that entire drive is GUID and you keep the existing journaled partition.
Make a second partition that is exFAT (more storage ability than FAT) using DU.
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Ok, I know this is probably an easy question but I have never done it before and was hoping to get some guidance.
I currently have a PowerBook G4 with an 80 GB HD, 1 GB RAM, SuperDrive, etc. I am moving abroad and plan on selling my PowerBook but would like to buy a new one when I return and have it be pretty much the same that I have now.
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It's a reasonable plan if it fits your particular needs. You can partition the drive using Disk Utility. The procdure that I recommend is as follows:
1. Open Disk Utility in the Utilities folder of your Applications 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. Click on the Partition tab in the DU main window.
3. Set the number of partitions from the dropdown menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled, if supported.) Click on the Partition button and wait until the volume(s) mount on the Desktop.
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, if supported.) 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 will take 30 minutes to an hour or more depending upon the drive size.
Repeat Steps 4-6 for each partition you create.
You can clone your hard drive using the Restore option of Disk Utility as follows:
1. Open Disk Utility from the Utilities folder unless it's already open.
2. Select the startup volume from the left side list.
3. Click on the Restore tab in the DU main window.
4. Drag the startup volume to the Source entry field.
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Hello, please help,
I've just bought a Western Digital 'My Passport' 320Gb USB (no firewire) portable external harddrive for backing up my data prior to iMac repair.
I also plan to totally wipe my PPC iMac and reinstall it with Leopard.
I erased the external HD, zeroing out the data from it's previous owner, and reformatted it as Mac OS Extended (not journaled).
Now I realise that it might be even more useful than I'd imagined.
I'd now like to partition it so I can use Carbon Copy Cloner to create a bootable copy of my entire iMac while using the rest of the drive as a separate partition for just backing up data.
Ideally I want to be able to use the drive on both Intel and PPC Macs and even PCs, is this possible? How should I format the drive to achieve this?
I've heard I should format it as Mac OS Extended (Journaled) HFS+, what ever that is
I'm currently running OS 10.4.11 but plan to buy Leopard and install that after the wipe.

17" 1.9Ghz iMac G5 (iSight)
I've just bought a Western Digital 'My Passport' 320Gb USB (no firewire)
I'd now like to partition it so I can use Carbon Copy Cloner to create a bootable copy of my entire iMac while using the rest of the drive as a separate partition for just backing up data.
Ideally I want to be able to use the drive on both Intel and PPC Macs and even PCs, is this possible? How should I format the drive to achieve this?
For what you want to do, there is a mismatch between your PPC computer and the external drive that you bought.
With a few exceptions, a PPC Mac requires a firewire external drive for booting and will not boot from a USB drive, regardless of which OS is installed and regardless of the partition scheme and volume format on the drive. I also have an iMac G5, and mine will not boot from USB.
If you do exchange your drive for a firewire drive, do not get another Western Digital model to use with your G5 - many external WD firewire drives will not boot a PPC mac. See [this page|http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?pfaqid=1787]
If you want to keep your present USB drive, you can still partition it with one partition for a backup clone and another for "other stuff". With respect to immediate use for recovering your stuff after a clean Leopard install on the HD, I think that Migration Assistant will still work, though I haven't tried this. As for the future, the problems with a clone not being bootable are 1) You can't test it to see if it works OK, and 2) If you do need to restore from it you'd need to boot from "somewhere else" - I think you could boot from an install disk and use Disk Utility's Restore feature to clone it back.
With regard to PC access, a PPC mac normally requires an Apple Partition Map partition scheme on the drive for booting, and such a scheme does not allow for the FAT32 volume format that is readable by PCs. However in this case since your PPC mac can't boot from it anyway, you could partition the drive as GUID. This would allow the main volume to be formatted as Mac OS Extended (Journaled) for the nonbootable clone, and would allow the extra volume to be formatted as FAT32. If you eventually got an Intel Mac, a clone from it to the main volume would also then be bootable.
But what I would do, if feasible, is exchange the USB drive and get a non-WD firewire drive instead.
Message was edited by: jsd2

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Can I do this?
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I need it to be a GUID partition map for booting
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Can this be done using Leopard ? I wanted to increase the size of the parttion for my MacBook Pro and reduce it for my daughter's MacBook partition on the external back up drive.

I am sure someone will have a bright idea, but you will lose data using Disk Utility:
http://docs.info.apple.com/article.html?artnum=306496
I think that the second volume is the one that has to be erased (the first one is expanding into its space). You can't increase the last partition.

How do I partition an external HD without formatting it or deleting data on it?

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