Symptom
1. In the Mac OS X 10.0 Installer, only a Mac OS Extended (HFS Plus) partition appears.
2. When started up from Mac OS X 10.0, a UFS disk or partition is not available (does not mount).
Solution
Mac OS X 10.0 and its Installer do not recognize a file system on Mac OS UFS disks or partitions formatted by Drive Setup 1.8.1. Subsequently, the Installer does not allow installation on such a disk or partition. To make this disk space available to Mac OS X 10.0, you must reinitialize the disk.
Warning: Always back up data you wish to keep before initializing a hard disk. Initialization erases all data on the hard disk.
Steps to initialize the startup disk:
1. Start up the computer from the Mac OS X 10.0 Installation CD-ROM.
2. At the first screen, choose Open Disk Utility from the Installer menu.
Note: Do not click Continue. If you do, you must restart from CD. There is not an option for backing up.
3. Select Drive Setup.
4. Select the hard disk you are going to reformat.
5. Click the Partition tab.
6. Set up the desired partition scheme and format.
7. Click Partition.
After this process is complete, Mac OS X 10.0 and its Installer can use the disk.