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Macintosh computers who have external firewire hard disks should make sure that their disks are formatted as "Mac OS X Extended" and not MSDOS (aka FAT32). Unfortunately, most commerically purchased firewire hard drives are preformatted as MSDOS/FAT32.
Partitioning a hard drive is the process of dividing a hard drive into separate, discrete sections, called 'volumes'. You can create up to 16 different partitions on a hard drive, each one can be of different size and format, even including the 'MS-DOS' format for use with PCs on a network. With hard drives getting bigger there are reasons why you might want to partition a hard drive. Partitioning can be used for organization purposes, i.e., each volume could be used as a media (scratch) drive, each for a different FCP Project. I typically partition into two volumes, one for FCP Captured media, the second for DVD SP projects, for Builds and MPEG 2 encoded files. With FireWire external hard drives reaching one Terabyte in size, partitioning the drive can make project and file management much more manageable.
Formatting
When you purchase a new hard drive for your Mac, either SATA/ATA (internal) or FireWire (external) the box that the drive comes in will likely tell you that the drive will run on both Macs and PCs. This is true, but because the drive is formatted for cross platform compatibility, some stability and facility issues could arise. It is possible that your new cross platform hard drive could have a 2 gig file size limit. Using the drive for FCP (and encoded files for DVD SP) could cause problems. 2 gigs is good for about 9 minutes of DV capture. Capturing clips longer than 9 minutes could result in the captured clip being broken into separate files. So ... whether you intend to partition your hard drive or not, you really should reformat your new hard drive for the Mac. If your new hard drive is FireWire and you intend to use it with both Macs and PCs, then leave it as is and do not reformat.
If you are going to partition your new drive you can skip down to the Partition section below, as when you partition your hard drive, you will reformat the drive during the partition process.
1. After you plugin your new hard drive and attach it to your Mac via a FireWire cable, the hard drive will mount on your desktop.
2. Open Disk Utility. Applications folder > Utilities folder > Disk Utility. Select the hard drive in the left hand column and click on the Erase tab.
3. In the Volume Format drop-down menu, select Mac OS Extended (Journaled) if you plan to place the Mac Tiger operating system on this drive to make it a bootable drive. Select Mac OS Extended if you plan to use the drive as a media (capture scratch) drive.
4. Name the drive.
5. Install Mac OS 9 Disk Driver
There is an option to Install Mac OS 9 Disk Drivers. If you plan on using the hard drive with a Mac booting from OS 9, or believe that this might be a possibility, then select the checkbox to install the Mac OS 9 drivers. You do not need to install the Mac OS 9 drivers to use the disk with the Classic environment. (or not because you will not connect the drive to a Classic 9 system)
6. Security Options. When the default setting 'Don't Erase Data' is used, only the Directory information (information used to locate files on the hard drive) is erased leaving the actual files intact. This means, that for awhile, there is the possibility of recovering files. Over time the files will be over-written with new files thus destroying the data. For the paranoid there are three additional settings to insure that no data can be recovered from the hard drive.
7. Once you have selected the format and have named the drive, click on Erase. You will be presented with the 'Are you Sure' dialog box. Note that the volume still has the name 'untitled' because the process has not yet run. After 'Erase' the name will change to your new name.
8. Click the Erase button again. The Erase process will take just a minute to erase and reformat your new drive.
Source: K. Stone, Thanks