Mac OS X Leopard (version 10.5) is the sixth major release of macOS, Apple's desktop and server operating system for Macintosh computers. Leopard was released on October 26, 2007 as the successor of Mac OS X 10.4 Tiger, and is available in two editions: a desktop version suitable for personal computers, and a server version, Mac OS X Server. 1.1 How many versions of R for Mac OS X? There is only one version of R for Mac OS X. However, R on Mac OS X can be used either on the command-line as on other Unix systems, or via the R.APP GUI (see R.app). The second approach is mostly preferred by Macintosh users.

1. In fact, you can see Mac OS X Base System in Disk Utility (under Recovery mode of course) but Disk Utility won't let you erase it. I'm wondering if it forms some sort of 'core' of Mac OS X Lion to use during the recovery process since when doing an Internet Recovery it says 'downloading additional components'. – Jason Waldrop Aug 24 '11 at 2:06.
2. Explore the world of Mac. Check out MacBook Pro, iMac Pro, MacBook Air, iMac, and more. Visit the Apple site to learn, buy, and get support.

Mac OS X is Apple's operatingsystem for its line of Macintosh computers. Its interface, known asAqua, is built on a Unix foundation. Although ithas much of the look and feel of the former Mac OS,features such as preemptive multitasking, symmetric multiprocessing,multithreading, and protected memory give Mac OS X improved stabilityand performance. For the current version's system requirements, seeApple's Mac OS XTechnical Specifications.

Currently, four Mac OS X-related products are available:

Mac OS X: This is the version most Macintoshowners should use. It is a consumer operating system designed for useon your personal computer. For more information, see Apple's Mac OS X page and Developer page forMac OS X.

Mac OS X Server: This is Apple's server operatingsystem. It is similar to the consumer release of Mac OS X, but alsoincludes a suite of network services, such as a print server, filesharing, QuickTime streaming, NetBoot, and advanced webhosting. For more information, see Apple's Mac OS X Server page.

iOS: Based on Mac OS X, versions of iOS run on theiPhone, the iPod touch, and the iPad. The iOS was designed forhandheld devices, and is much more tightly controlled than otherversions of Mac OS X. Despite their shared origins, applications(apps) developed for iOS are not compatible with Mac OS X, and viceversa.

Darwin:Darwin is the Unix-likefoundation upon which Mac OS X is based. Its code is opensource, and it is available as a stand-alone operatingsystem. Although Darwin will run many Unix applications, including theX Window System, it does not have the Mac OS X interfaceand thus will not run Mac OS X applications. For more information, seeApple's Developer Open Sourcepage.

A phishing scam has targeted Mac users by redirecting them from legitimate websites to fake websites which tell them that their computer is infected with a virus. Update to mac 10.14. The user is then offered Mac Defender 'anti-virus' software to solve the issue.
This “anti-virus” software is malware (i.e. malicious software). Its ultimate goal is to get the user's credit card information which may be used for fraudulent purposes.
The most common names for this malware are MacDefender, MacProtector and MacSecurity.

Apple released a free software update (Security Update 2011-003) that will automatically find and remove Mac Defender malware and its known variants.
The Resolution section below also provides step-by-step instructions on how to avoid or manually remove this malware.

Resolution

How to avoid installing this malware

If any notifications about viruses or security software appear, quit Safari or any other browser that you are using. If a normal attempt at quitting the browser doesn’t work, then Force Quit the browser.

In some cases, your browser may automatically download and launch the installer for this malicious software. If this happens, cancel the installation process; do not enter your administrator password. Delete the installer immediately using the steps below.

1. Go into the Downloads folder, or your preferred download location.
2. Drag the installer to the Trash.
3. Empty the Trash.

How to remove this malware

If the malware has been installed, we recommend the following actions:

• Do not provide your credit card information under any circumstances.
• Use the Removal Steps below.

Mac Os X Base System This Disk Is Locked

Removal steps

1. Move or close the Scan Window.
2. Go to the Utilities folder in the Applications folder and launch Activity Monitor.
3. Choose All Processes from the pop up menu in the upper right corner of the window.
4. Under the Process Name column, look for the name of the app and click to select it; common app names include: MacDefender, MacSecurity or MacProtector.
5. Click the Quit Process button in the upper left corner of the window and select Quit.
6. Quit Activity Monitor application.
7. Open the Applications folder.
8. Locate the app ex. MacDefender, MacSecurity, MacProtector or other name.
9. Drag to Trash, and empty Trash.

Malware also installs a login item in your account in System Preferences. Removal of the login item is not necessary, but you can remove it by following the steps below.

Yosemite supported macs drive. OS X Yosemite (/ j oʊ ˈ s ɛ m ɪ t i / yoh-SEM-it-ee; version 10.10) is the eleventh major release of macOS, Apple Inc.' S desktop and server operating system for Macintosh computers. OS X Yosemite was announced and released to developers on June 2, 2014, at WWDC 2014 and released to public beta testers on July 24, 2014. OS X Yosemite Supported Systems. Specifically, the following Macs are compatible with OS X Yosemite, but did not ship with the operating system by default. However, just because a Mac runs OS X Yosemite does not mean that it is compatible with all features. Learn how to set up and use macOS. Find all the topics, resources, and contact options you need for macOS.

• Open System Preferences, select Accounts, then Login Items
• Select the name of the app you removed in the steps above ex. MacDefender, MacSecurity, MacProtector
• Click the minus button

Mac Os X Base System Disk

Use the steps in the “How to avoid installing this malware” section above to remove the installer from the download location.

Mac Os X Base System Download

Note: Apple provides security updates for the Mac exclusively through Software Update and the Apple Support Downloads site. User should exercise caution any time they are asked to enter sensitive personal information online.