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what is an ISO file and how to use it

ISO file is a complete CD image file, full name ISO9660, used to store system installation, software distribution or CD backup. 1. It is not a compressed package, but a complete disk copy. It cannot be run directly, but can be recognized by specific software or written to a USB flash drive/disk; 2. Opening methods include browsing with WinRAR/7-Zip and mounting as a virtual optical drive (supported by Windows/macOS/Linux); 3. When installing the system, you need to use Rufus/Ventoy and other tools to write ISO to the USB flash drive and set it up to boot; 4. Other uses include running classic games, deploying server images, saving genuine CD content, etc., which are one of the common skills in technical work.

Jul 11, 2025 am 03:24 AM

Keyboard shortcut for find

Mastering the "find" shortcut key can significantly improve efficiency. The core answers and key points are as follows: 1. The general shortcut key for Windows/Linux is Ctrl F, and the Mac is Command F; 2. Use this shortcut key in the browser to highlight the matching content, and you can view the next one through Enter/F3 and find the previous one through Shift F3; 3. Office and text editors such as Word, Excel, and Notepad also support Ctrl F, and provide advanced functions such as wildcards, regular expressions, etc.; 4. The replacement operation can be completed in one step in Ctrl H; 5. It is recommended to check the help document to confirm the shortcut keys in different systems or devices. Proficient in using these techniques can help improve daily productivity

Jul 11, 2025 am 03:23 AM

how to update graphics driver

Regular updates to the graphics card driver can improve system stability and performance, especially suitable for gaming and graphic design users. 1. Confirm the graphics card model and view it through dxdiag or GPU-Z; 2. Use the device manager to automatically update, suitable for beginners but may not be the latest version; 3. It is recommended to manually download the official website driver, select the complete installation package and customize the installation as an administrator; 4. The update frequency depends on the purpose. Gamers recommend checking it once a month, and office users will be updated every two or three months. When problems arise, they should be updated in time.

Jul 11, 2025 am 03:21 AM

update

what is an operating system

The operating system is the basic software for managing hardware resources, running programs, and providing user interaction interfaces. It coordinates the relationship between hardware and software and is responsible for memory allocation, device scheduling, file management and multitasking. Common systems include Windows (suitable for office and gaming), macOS (Apple devices, suitable for creative work), Linux (open source, suitable for developers), and Android/iOS (mobile device system). The choice of ordinary users depends on the usage scenario, such as software compatibility, security and customization requirements. How to view system information: Use winver command for Windows, click on the machine for macOS, use terminal commands for Linux, and find the phone in settings. The operating system is the underlying tool for daily use,

Jul 11, 2025 am 03:16 AM

operating system os

my computer won't turn on

If the computer cannot be turned on, you can check the following steps: 1. Check whether the power supply is normal, including plugs, sockets, power cords and battery power; 2. Confirm whether the screen is completely undisplayed and not the computer is not started, and you can judge the sound of the fan or hard disk; 3. Troubleshoot the monitor connection problem and try to connect to the external monitor; 4. Troubleshoot hardware failures, such as loose memory stick, abnormal motherboard power supply or power module problems, and seek professional help if necessary. Most cases can be solved through basic investigation without the need to replace the equipment immediately.

Jul 11, 2025 am 03:09 AM

computer Unable to start

how to open Task Scheduler

There are three ways to open the task scheduler. First, search through the Start menu, click the Start button and enter "Task Schedule Program" and select the corresponding result; second, use the Run dialog box, press Win R key to enter taskschd.msc and press Enter; third, find the task scheduler in the management tool through the control panel. These methods are suitable for Windows 10 and Windows 11 systems, and can eventually enter the task scheduler interface for task management.

Jul 11, 2025 am 03:08 AM

Open

Excel shortcut for sum

Using Alt = is a shortcut to quickly sum it in Excel, which can significantly improve efficiency. The specific operations are as follows: 1. Place the cursor below the column of the required sum or to the right of the row; 2. Press Alt =, and Excel will automatically insert the SUM formula; 3. If the data is continuous, the sum can be completed directly. If there is a blank, only the data before the first blank will be summed; 4. You can select multiple cells first and then use shortcut keys to achieve summing of multiple rows and columns at the same time; 5. When more precise control is required, you can adjust the range with the arrow keys; 6. If the data contains hidden rows, you can only sum the visible cells by =SUBTOTAL (109, range) and customize the shortcut keys to improve efficiency.

Jul 11, 2025 am 03:07 AM

Sum Excel shortcut keys

how to use Disk Cleanup

DiskCleanup can free up C disk space by cleaning up the system, updating residual, temporary files and recycling bin content, system restore points, and using the "Clean System Files" function. The specific steps are: 1. Check "Windows Update Cleanup" to delete the old update files, but it cannot be rolled back; 2. Check "Temporary Files" and "Recycle Bin" and other basic projects to clean up; 3. Carefully check "System Restore and Shadow Copy" to delete the old restore point; 4. Click "Clean System Files" to expand to scan more system-level garbage. Reasonable operation can free up several GB of space, which is suitable for confirming that the system is stable.

Jul 11, 2025 am 03:06 AM

how to find the serial number on a Mac

The serial number of Apple computer can be obtained by the following methods: 1. View in the system: Click the Apple menu → "About this machine" to view the 12-digit serial number; 2. Search through terminal commands: Open "Terminal" and enter the command system_profilerSPHardwareDataType|grep"SerialNumber" to obtain; 3. Check the outer packaging or purchase certificate: The label on the back of the packaging box, invoice or order record of the Apple official website; 4. Search online with the Apple ID account: Log in to the Apple official website account page, and check the serial number and warranty status of the associated device in the "Device" section.

Jul 11, 2025 am 02:49 AM

mac serial number

What parts do I need to build a PC

To assemble a PC, the necessary components include: 1. The CPU (processor) is responsible for computing, and the number of cores and compatibility with the motherboard is taken into account when selecting; 2. The motherboard is connected to all components and needs to match the CPU socket, chipset and size; 3. The RAM memory is recommended to be at least 16GB, and it is equipped with the speed and dual-channel configuration supported by the motherboard; 4. The GPU graphics card is used for graphics-intensive tasks, and the appropriate model is selected according to the resolution; 5. The storage is preferred to choose NVMeSSD, supplemented by HDD to increase capacity; 6. The power supply is 80 certified, with sufficient power and leave a margin; 7. The chassis is adapted to the motherboard size, taking into account both the heat dissipation and expansion space; 8. The cooling equipment includes CPU radiator and the chassis fan to ensure a good air duct. In addition, RGB lighting, additional fans or wireless modules are available.

Jul 11, 2025 am 02:46 AM

how to view crash logs in Windows

Use the event viewer to view the crash log: Press Win R to enter eventvwr.msc, click "Windows Log" → "System" or "Application" in turn, filter the error level log, pay attention to event ID 41, 6008, etc., view the time, error code, module name and other content in the detailed information, and pay attention to keywords such as "BugcheckCode" and "Causedby". 2. View the memory dump file (dump file): Go to the C:\Windows\Minidump or C:\Windows\Panther directory, use the WinDbg tool to open the dump file and enter the !analyze-v command to analyze, and follow the prompts in the analysis results.

Jul 11, 2025 am 02:45 AM

How to partition a hard drive?

Is it necessary to partition hard disk? The answer is based on demand. If you have a lot of data to manage, want the system to be separated from the data or want to install dual systems, partitioning is necessary. The benefits include that the data is not affected when reinstalling the system, the file classification is clearer, and the flexibility of multi-system startup; before partitioning, you must back up important data, confirm the hard disk type (MBR/GPT), and check the available space; the partitioning steps using Windows' own tools are: Open disk management → Right-click the target area → Compress volume → Enter the compression size → Create a new simple volume → Set the disk letter and format; third-party tools recommend MiniToolPartitionWizard, EaseUSPartitionMaster and GParted, suitable for advanced skills

Jul 11, 2025 am 02:32 AM

Tutorial Hard disk partition

how to disable firewall

There are security risks when closing the firewall, and it is recommended to operate only if necessary. Windows users can turn off through the "WindowsDefender Firewall" setting in the control panel, select the dedicated and public network settings, and click "Close Firewall"; macOS users can unlock and close the firewall in "Privacy and Security". Linux systems use ufw's executable sudoufwdisable, while firewalld can be stopped and disabled by the systemctl command to stop and disable booting. After closing, you should avoid long-term exposure to the public network environment, turn on it in time after the test is completed, and priority should be given to configuration rules rather than shutting them down completely to ensure safety.

Jul 11, 2025 am 02:27 AM

firewall

Using Windows keyboard on Mac shortcuts

Operating on a Mac using a Windows keyboard allows you to quickly adapt by replacing the keys. 1. The Command key replaces the Windows key, which realizes copy-paste (Command C/V), Select All (Command A), Close window (Command W), etc.; 2. The Alt key corresponds to the Option key, which is used to enter special characters such as backticks and Euro symbols; 3. The function key behavior can be adjusted, and the brightness volume needs to be adjusted by default with the Fn key. It can also be set to directly use F1-F12 in the system settings; 4. Some missing keys can be replaced by key combinations, such as the Command arrow keys for Home/End, Shift Command 4 for screenshots, and you can also install tools to customize them.

Jul 11, 2025 am 02:13 AM

java programming