Drive Setup installs software (called a disk driver) that allows your computer to communicate with the hard disk. Use Drive Setup 1.7.3 to update your disk driver or to reinitialize a disk. When you initialize a disk, all of its contents are erased. IMPORTANT Earlier versions of Drive Setup can reintroduce issues resolved with Drive Setup 1.7.3. This version includes improved reliability for Ultra ATA transfers on G3 Blue and White machines. When to use Drive Setup 1.7.3 * Immediately after you set up your computer for the first time. * Any time you install Mac OS versions 7.6, 7.6.1, 8.0, 8.1, 8.5, 8.5.1, or 8.6 on your computer, you should use Drive Setup 1.7.3 to update the driver on your hard disk again. If you are using a version of Mac OS prior to 7.6, it is not necessary to use Drive Setup 1.7.3 to update your hard disk drive. Note that Drive Setup 1.7.3 was tested with and is supported with System 7.5 through Mac OS 8.6.Note: Several versions of Drive Setup are posted to Software Updates online. Please make sure that you have the appropriate version for your system. TIL Article 30020 explains the Version history (Click on "Related Technical Articles" link below).