4K

4K resolution refers to a horizontal display resolution of approximately 4,000 pixels.  Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 3840 × 2160 (4K UHD) is the dominant 4K standard, whereas the movie projection industry uses 4096 × 2160 (DCI 4K).

The 4K television market share increased as prices fell dramatically during 2014] and 2015. By 2020, more than half of U.S. households are expected to have 4K-capable TVs, a much faster adoption rate than that of Full HD (1080p).

ActiveX

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ActiveXOriginal author(s)MicrosoftDeveloper(s)MicrosoftInitial release1996; 24 years agoWebsitemicrosoft.com/com/tech/activex.asp 

ActiveX is a deprecated software framework created by Microsoft that adapts its earlier Component Object Model (COM) and Object Linking and Embedding(OLE) technologies for content downloaded from a network, particularly from the World Wide Web.[1] Microsoft introduced ActiveX in 1996. In principle, ActiveX is not dependent on Microsoft Windows operating systems, but in practice, most ActiveX controls only run on Windows. Most also require the client to be running on an x86-based computer because ActiveX controls contain compiled code.[2][page needed]

ActiveX is still supported as of Windows 10 through Internet Explorer 11, while ActiveX is not supported in their default web browser Microsoft Edge (which has a different, incompatible extension system)

Target Disk Mode

Use target disk mode to move files to another computer

Use target disk mode to make a Mac appear as an external hard disk on another Mac, allowing you to quickly browse and copy files.

Connect your computers with the correct cable

Identify the ports on both Mac computers so that you can choose the correct cable. Target disk mode works when your computers are connected to each other using any of these ports:

  • Thunderbolt 3 (USB-C) 

  • USB-C 

  • Thunderbolt 2 

  • FireWire 
    Target disk mode doesn't support connections that use an Apple USB-C Charge Cable, USB-A to USB-A cable, or Mini DisplayPort  cable. 

If one or both computers has a Thunderbolt 3 (USB-C) or USB-C port, you can connect them as follows:

Start up in target disk mode

Take either of these steps on the Mac that you want to use as the external hard disk:

  • Turn on the Mac and immediately press and hold the T key while it starts up. 

  • If the Mac is already turned on, choose Apple menu  > System Preferences, then click Startup Disk. Click Target Disk Mode, then click Restart when you're asked to confirm.

When your Mac enters target disk mode, it displays a large Thunderbolt , USB , or FireWire  symbol onscreen. If your computers are connected to each other correctly, the Mac in target disk mode should now be available as a disk on the other Mac. Use it as you would any other disk.

To exit target disk mode, first eject the diskfrom the other Mac. For example, select the disk, then choose File > Eject. Or just shut down the other Mac. Then press and hold the power button for up to 10 seconds on the Mac you're using as a disk. Release the button when the Mac turns off.

If the target disk doesn't appear on the other Mac

If the Mac in target disk mode doesn't appear as a disk on the other Mac, follow these steps to mount the disk:

  1. Open Disk Utility on the other Mac. It's in the Utilities folder of your Applications folder.

  2. If the connection between your computers is good and you followed the steps to start up in target disk mode, the target disk should appear as a volume in the Disk Utility sidebar. Select that volume, then choose File > Mount from the menu bar, or click Mount in the toolbar.

  3. If the target disk is FileVault-encrypted, you're asked to enter a password to unlock the disk and mount it. Enter the administrator password for the Mac that you started up in target disk mode.

The disk should now be mounted and available to your Mac. However, if it's formatted for APFS, your Mac must be using High Sierra or later. Earlier versions of the Mac operating system don't mount APFS-formatted volumes.

As an alternative to target disk mode, you can use AirDrop to send content between two Mac computers wirelessly.

micrometer

A 6 μm diameter carbon filament above a 50 μm diameter human hair.

A 6 μm diameter carbon filament above a 50 μm diameter human hair.

Micrometre, also called micron, metric unit of measure for length equal to 0.001 mm, or about 0.000039 inch. Its symbol is μm. The micrometre is commonly employed to measure the thickness or diameter of microscopic objects, such as microorganisms and colloidal particles. Minute distances, as, for example, the wavelengths of infrared radiation, are also given in micrometres.

Between 1 μm and 10 μm:

T2 Security Chip

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The Apple T2 Security Chip is Apple's second-generation, custom silicon for Mac. By redesigning and integrating several controllers found in other Mac computers—such as the System Management Controller, image signal processor, audio controller, and SSD controller—the T2 chip delivers new capabilities to your Mac.

For example, the T2 chip enables a new level of security by including a secure enclave coprocessor that secures Touch ID data and provides the foundation for new encrypted storage and secure bootcapabilities. And the T2 chip's image signal processor works with the FaceTime HD camera to enable enhanced tone mapping, improved exposure control, and face-detection–based autoexposure and auto white balance.

Computers that have the Apple T2 Security Chip

These Mac computers have the Apple T2 Security Chip:

You can also use System Information to learn whether your Mac has this chip:

  1. Press and hold the Option key while choosing Apple () menu > System Information.

  2. In the sidebar, select either Controller or iBridge, depending on the version of macOS in use.

  3. If you see "Apple T2 chip" on the right, your Mac has the Apple T2 Security Chip.

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