With this complete, try installing Lion again. Save the changes by clicking Apply, and then revert them and click Apply again. Then click the Partition tab, select the drive partition in the partition scheme diagram, and change its size by a few gigabytes. To do this, open Disk Utility and select the drive device. ![]() This folder is used on Time Machine disks to store backups, and if for some reason it has been created or included on the target boot drive then the Lion installer might be recognizing the drive as a backup drive and not as one on which to install Lion.Īnother fix people have used is to temporarily resize the drive's partition slightly. It appears some instances of this problem happen with drives that either have been restored from Time Machine backups or have previously been used for Time Machine backups, so there may be a residual "Backups.backupdb" folder on the hard drive. When the installer lists the available volumes on the system, it may say either, "This disk cannot be used to start up your computer," or, "Lion cannot be installed on this drive." This problem occurs even after people have run Disk Utility's drive-verification and permissions-fix routines. Some people who have purchased OS X 10.7 Lion are noting that they cannot get the downloaded installer to properly recognize their desired volumes for installing the OS.
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