Apple Power Macintosh 5400 series - Manual (Page 111)

2 Open the Drive Setup program.
You may need to look in a folder called Utilities to find Drive Setup.
3 In the list of drives, click the disk you want to initialize.
4 Click Initialize to initialize the hard disk.
5 Click Quit when you see a message reporting that initialization was successful.
If a message reports that initialization failed, try again. If initialization
fails a second time, take the disk to your Apple-authorized service provider
for repair.
99 Troubleshooting
Click the drive you
want to initialize...
...then click Initialize.