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Dec 18, 2025

What exactly does a secure eject USB do?

When the "device in use" message appears when ejecting a USB flash drive, it is usually due to a program using files from the device. To do this, we need to close the program or window that is using the data on the USB drive and then try to eject it again.

Dec 17, 2025

What are the Wi-Fi password security levels?

After paying attention to the Wi-Fi signal strength you also need to pay attention to the Wi-Fi security level, which can help prevent information loss and even prevent scraping behavior.

Dec 16, 2025

How does the projector work?

The working principle of the projector is based on the fusion of optical and electronic technologies.

Dec 15, 2025

Mobile phone battery is not durable? 14 tips to extend battery life

If the user wants to extend the effective service life of the battery, in addition to the quality of the charger, the correct charging method is also essential, because the poor quality charger or the wrong charging method will affect the service life and cycle life of the battery. Here are the tips on extending the life of the mobile phone charging battery that the author has compiled:

Dec 14, 2025

How does the camera work?

The working principle of the camera can be divided into four key steps: optical imaging, electrical signal conversion, digital signal processing and image output.

Dec 13, 2025

How to do when the mouse is not working

The mouse and keyboard, like, is to assist us in computer operation equipment, but compared to the desktop mouse, the laptop mouse seems to be more problems

Dec 12, 2025

How to delete all alarms on iPhone in one step?

Fear of oversleeping at work, or fear of missing a date with friends, we will habitually set an alarm clock on the phone every few minutes. The list of alarms is not enough to fill the screen, so you can't sleep with peace of mind.

Dec 10, 2025

What is the difference between power adapter and charger

The working principle of power adapter and charger is the same, both use the principle of AC power conversion to convert AC power into DC power to meet the power needs of the device.

Dec 08, 2025

What is the subnet mask

Subnet mask is also called network mask, address mask and subnet mask. It is used to indicate which bits of an IP address identify the subnet where the host is located and which bits identify the bit mask of the host. The subnet mask cannot exist alone. It must be used in combination with the IP address. The subnet mask has only one function, which is to divide an IP address into two parts: network address and host address. The subnet mask is the basic knowledge that everyone who uses the Internet must master. Only by mastering it can you truly understand the TCP/IP protocol settings. Let's explain what subnet mask is in simple terms.

Dec 06, 2025

What is Qualcomm three carrier aggregation

The mobile network has become a part of our daily life. Mobile phones can't leave the mobile network without sending WeChat messages to watch live games. However, many users will find that some mobile phones need to cache and play games when watching live broadcasts, but some mobile phones do not. Even if you use the same operator's network, the transmission speed of the mobile phone network will vary greatly at the same time and place. What? This may be because your phone does not support carrier aggregation. What is carrier aggregation? Next, we will introduce the carrier aggregation technology and the application of high pass carrier aggregation technology in detail.