Mac OS X 10.1: Do Not Reinstall After Using the Mac OS X Update 10.1.1, 10.1.2, 10.1.3, 10.1.4, or 10.1.5

You should not reinstall Mac OS X 10.1 (build 5G64) from CD-ROM over an existing Mac OS X 10.1 installation after the Mac OS X Update 10.1.1 (build 5M28), 10.1.2 (build 5P48), 10.1.3 (5Q45), 10.1.4 (5Q125), or 10.1.5 (5S60) has been installed.

If you need to reinstall Mac OS X 10.1, you should back up data and erase the affected hard disk or partition prior to installation. Follow these steps:

1. Back up important data and documents stored on your Mac OS X 10.1 disk.
2. Erase your Mac OS X 10.1 disk. You may do this from within the Mac OS X 10.1 Installer.
3. Install Mac OS X 10.1.
4. After installation is complete, apply software updates in the order described in technical document 106713, "Mac OS X 10.1: Chart of Available Software Updates".

Related information

Technical document 106176: "Mac OS X: About This Mac "Build" Information"