![]() The MobileBackups volume contains a similar structure as a Time Machine disk, but its contents are stored on the main boot drive. If you open the MobileBackups virtual disk in the Finder, you will see a similar data structure on it as you would see on the Time Machine drive, with a main "Backups.backupdb" directory followed by a folder for your computer, which contains individual backup instances. In addition, this folder is used as the mount point for software-based disks such as opened disk images, network shares, and, in Lion, Apple's virtual drive for holding the mobile Time Machine snapshots. This command will list the contents of the hidden "Volumes" folder at the root of your hard drive, which will contain your boot drive and any additional drives that the system has mounted (both external and internal). When you delete a file, the system will still retain it in a virtual disk called "MobileBackups," which you can see if you open the Terminal and type the following command: The reason for this difference is Apple's move to include local backup snapshots on the system in Lion, which allow you to access recent backups of files without needing to have your Time Machine disk updated and attached to your system. In fact, in an odd way both values are correct. This discrepancy might be confusing to people, but overall the differences in these values does not mean much for the end-user. This same value is repeated elsewhere in the program, such as in the properties listed when you get information on the disk and scroll to the "Free Space" section. On my system, instead of the expected 184.43GB as the available disk space, Disk Utility reports about 2GB less, at 182.34GB. (Click for larger view)Įven though these two areas report similar available disk space, if I go to Disk Utility and select "Macintosh HD" in the device list, it is apparent that this number is not the same in this program. The Finder (top) shows 184.43GB as being available, yet Disk Utility shows 182.34GB. ![]() ![]() This same number is reported below the Finder window in the status area, which can be enabled in the View menu or by pressing Command-slash. ![]() However, while these options will display the available disk space on the system, in OS X Lion you might see some differences between the numbers reported in these areas.įor example, on my Mac running OS X Lion there is currently 184.43GB of free space reported as being available on the disk if I get information on my hard disk in the Finder. There are several ways to display disk usage in OS X, with some of the more-common options being the Finder's status bar, or to get information on your hard disk in the Finder, or to use Apple's Disk Utility program. ![]()
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