message appears during installation: MAC disc is locked

Hey virgis73,

Thanks for the question. In researching your issue, I found the following resource that may help to resolve this message:

iMac (Early 2001): Software Installers Report the Disk Is Locked

http://support.apple.com/kb/TA25425

Solution

- If you started up the computer with a CD-ROM disc, try restarting the computer from the hard disk and then installing the software.

- The hard disk's directory structure may need to be repaired. Open Disk First Aid and verify or repair the disk before installing any software. To obtain the latest version of Disk First Aid, use the Software Update control panel or check Apple Software Updates (http://www.apple.com/swupdates/).

- If Disk First Aid cannot repair the hard disk or the Disk is Locked error persists, you may try a third-party drive repair utility.

Note: Before attempting any disk repairs, you should back up your data. Apple does not recommend nor support the use of third party drive repair utilities. Check with the vendor of the repair utility before using it for any specific recommendations.

If the above does not resolve your issue, see these additional resources:

Troubleshooting Mac OS X installation from CD or DVD

http://support.apple.com/kb/HT2956

Troubleshooting Mac OS X installation and software updates (Mac OS X v10.6 and earlier)

http://support.apple.com/kb/TS1394

Thanks,

Matt M.