Ipartition Serial 34

I have a 250G external HD on which I have 3 partitions. One is a Time Machine backup and the others are for 'manual' backup. I am running 10.6.4 on an iMac. I just realized that I have the ext HD partitioned using an Apple Partition Map instead of GUID.

This goes back to my using the HD for my old machine and using SuperDuper to back up. I understand that I really should have the ext HD partitioned with GUID. Is that correct? Can I change the partition scheme without erasing the ext HD? Assuming I cannot, what are your comments about copying the contents of the ext HD to my iMac (plenty of room), properly reformatting and repartitioning the ext HD, and then copying the backup files back to the ext HD?

Will Time Machine recognize the backup files in their 'new' location? Hi David: If you are only needing the external for Mac OS X extended file system (hfs+) partitions, then reformatting to GUID (GPT) is a waste of time. GPT does not change anything about the HFS+ file system. It only allows other file systems such as MSDOS to be installed, any HFS file systems present on a GPT disk are nothing more than a Apple APM format with a GPT wrapper. If you need to make the APM formatted drive bootable, you won't be able to use the install disks to do it though. Install disks require a GPT format. You can however, use super duper or CCC to place a clone on the APM disk, and it will boot.

In other words, you can still boot from an APM disk, you just can't use the install dvd to install the OS on it. There is a third party utility that can do anything and everything you want done without reformatting or repartitioning.

You would still be wise to backup before using.

It's not a free utility, but here is a link to it: You would still be wise to backup before using iPartition though. Kj Message was edited by: KJK555. You are correct, although it is not essential except under certain circumstances. You cannot change the partition map scheme without repartitioning the drive which will result in the loss of everything on the drive. You will need to copy the data to another drive preferably not your startup volume.

Backing up from your startup volume to the startup volume is not backing up. For advice on using TM: See for help with TM problems. Also you can select Mac Help from the Finder's Help menu and search for 'time machine' to locate articles on how to use TM. You are correct, although it is not essential except under certain circumstances. You cannot change the partition map scheme without repartitioning the drive which will result in the loss of everything on the drive.

You will need to copy the data to another drive preferably not your startup volume. Backing up from your startup volume to the startup volume is not backing up. For advice on using TM: See for help with TM problems.

Also you can select Mac Help from the Finder's Help menu and search for 'time machine' to locate articles on how to use TM. Were you to do that then I would first turn off TM until you finish reformatting the external drive. To transfer the TM backup properly you should use Carbon Copy Cloner -. Do not simply use Drag and Drop copy for the TM backup folder. If you plan to copy the TM backup to another partition on the startup drive then use the Restore option of Disk Utility to transfer from the external drive to the partition on the startup drive.

Do the same in reverse when transferring back to the external drive. Once you complete this process you can enable TM. The short time that it will be on the startup drive is just when the startup drive will fail. You'll have to decide for yourself, but I myself would not re-partition the current external drive unless you decide to get a second external drive and create another backup there first. The probability of your startup drive failing during the short time needed for the repartition process is obviously small, but the consequences would be awful.

Balanced against this, what would you actually gain by repartitioning the external drive as GUID? The only disadvantages that I am aware of if you keep the present APM scheme are: 1) You would not in the future to be able to install OS X on any of the volumes there. 2) You would not be able to re-format a volume there as Windows-readable FAT32. There would be no difference regarding your current use of the drive. You can use an APM-partitioned disk for any type of Mac file storage, including all data files and Time Machine.

You can even create a bootable backup clone there, even though your Mac is an Intel. An APM disk will boot an Intel Mac - the limitation is only that OS X can't be installed there via an installer. In fact, the factory-supplied Snow Leopard Install DVD for my 2010 Mac mini has an Apple Partition Map scheme. Hi David: If you are only needing the external for Mac OS X extended file system (hfs+) partitions, then reformatting to GUID (GPT) is a waste of time. GPT does not change anything about the HFS+ file system. It only allows other file systems such as MSDOS to be installed, any HFS file systems present on a GPT disk are nothing more than a Apple APM format with a GPT wrapper. If you need to make the APM formatted drive bootable, you won't be able to use the install disks to do it though.

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