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Learn how to use Disk Copy or Disk Utility to create an encrypted disk image, which requires a password to open or become available (to "mount"). This document applies to Mac OS X 10.2 or later. You move files to or from an encrypted disk image as easily as you can from a non-encrypted disk image. Follow these steps to create one:

If you're wondering what the video requirements are for Quartz Extreme and Core Image in Mac OS X 10.4 Tiger, find out in this informative document. Note: Quartz Extreme and Core Image are impressive video enhancements in Tiger that appear on fast Macs. But even if you have an older computer that can't use Quartz Extreme or Core Image, it can still run Tiger if it meets the system requirements. If you have a third-party video card installed, contact the card manufacturer to determine if it is Tiger-compatible.

When installing Mac OS X 10.5 Leopard, the only available installation option may be Erase and Install. An alert may appear during installation, such as "You can not install mac os x on this volume with out changing your installation settings...".

Learn how to reinstall Mac OS 9, or how to recover after performing a Mac OS 9 Software Restore option on your Mac OS X disk. You might need to do this to install a System Folder for Classic. This does not affect your computer if the Mac OS 9 System Folder that you are restoring is located on a different hard disk or hard disk partition than Mac OS X. This document can help if: The computer will not start up from Mac OS X. When you try to do so, an icon of a belt around a

This software updates Mac OS X Server version 10.5, 10.5.1, or 10.5.2 to 10.5.3.

In Mac OS X Server 10.5.3, search for a partial name in Workgroup Manager or the Directory application may not return all expected results.

Issue or symptom After installing the Mac OS X 10.5.2 Update, the client's Server Monitor application may not connect to a server. Also, the ipmitool command may report "Library not loaded" when run. This could occur on a non-server Mac that has Server Admin tools installed.

Binding or authentication to an Active Directory domain may not succeed if there aren't DNS records to resolve the domain and forest names in the Active Directory environment.  An "error -14006" message will appear to clients if using the simple setup, or an "An invalid Domain and Forest combination was specified" alert if using the advanced setup.

Server Admin Tools 10.5.3 contain remote administration tools, documentation, and utilities that you can install on a computer other than your server. This version is required to administer Mac OS X Server version 10.5.3 from a remote Mac client. The Server Admin Tools 10.5.3 are available as a manual download from Apple Support Downloads, or as an automatic Software Update for Macs running Mac OS X 10.5.3 with version 10.5 of the Server Admin Tools already installed. Note: The Server Admin Tools 10.5.3 require Mac OS X version 10.5.3.

In Mac OS X 10.5.3 or later, the Back to My Mac tab of .Mac preferences (in System Preferences) includes a visual status indicator.  Back to My Mac's status is represented by a green, yellow, or red status light ("dot") next to "Back to My Mac: On" or "Back to My Mac: Off". This can be a useful tool for diagnosing issues that might occur when connecting to other supported computers via Back to My Mac.

Tips on using Time Machine with Aperture.

If you're trying to install Mac OS X on a hard disk that you've connected to your Intel-based Mac, you may see this alert in Installer and be unable to select the disk for installation: "You cannot install Mac OS X on this volume. Mac OS X cannot start up from this volume." The Mac OS X installer prevents you from installing on to a disk that uses a non-native partition scheme (or to any volumes on that disk). PowerPC-based Macs and Intel-based Macs have different native partition schemes (see additional information below).

In some cases, when opening an application an alert message may appear: "You cannot use this version of the application <application name> with this version of Mac OS X."  The application does not open.    

Learn how to zero all data on a disk, a practice that makes data on an erased (initialized) disk less recoverable. Tip: For Mac OS X 10.4 or later information, see this page. Warning: This document discusses procedures for erasing a disk entirely. Be sure to make backup copies of any files you want to keep before performing any procedures discussed in this document.

Find out which digital camera RAW files are supported by Mac OS X 10.5 Leopard or later. Many digital cameras offer options to save pictures in digital camera RAW format. Digital camera RAW formats retain more image information than JPEGs and can produce better results when used with imaging applications such as Aperture and iPhoto. Mac OS X Leopard provides system-level support for digital camera RAW formats from the following cameras.

After installing Safari 3.1 in Mac OS X 10.5.2, you may have issues syncing bookmarks with .Mac, an iPhone, or an iPod Touch.

After making an authenticated connection to an AFP server in a Mac OS X "Connect to Server" dialog, then either being granted a Kerberos ticket to the AFP server or selecting the "Remember this password in my keychain" option, you may not be able to authenticate to that server via a different user account.

Back to My Mac (BTMM) is a Mac OS X 10.5 Leopard feature that makes it easy to automatically connect to your other computers over the Internet. It requires the use of either an AirPort base station with NAT-PMP (NAT Port Mapping Protocol), or a third-party Internet router with UPnP (Universal Plug and Play) technology. For more information on setting up Back to My Mac, see this article. Note: For best compatibility with Back to My Mac you should: Update to Mac OS X 10.5.3 or later. You can use Software Update to download and install available Leopard updates.

The Mac OS X 10.5.3 Update is recommended for Mac OS X 10.5, 10.5.1, and 10.5.2 Leopard. It includes general operating system improvements that enhance the stability, compatibility, and security of your Mac. For detailed information about security updates, please visit this website. Mac OS X 10.5 Leopard is packed with over 300 new features, installs easily, and works with the software and accessories you already have.

Prior to the installation of Boot Camp drivers for Windows (from the Leopard Install DVD), Windows Vista may indicate that there are some compatibility issues: The following may be reported from "Problem Reports and Solutions > Information about other Problems." "Problem caused by advanced Configuration and Power Interface" "Download and install the driver for Apple Performance Counters" "Windows Vista does not support Built–in iSight"