Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11systemd is Linux’s system and service manager. On systems that use it, it can run as the first userspace process (PID 1), manage units such as services and targets, and coordinate their requested state changes during startup and system operation. Its key ideas are straightforward: units are the objects it manages, targets group units into broader milestones, and dependencies specify what should be activated and in what order.
What does systemd do?
systemd manages system startup and ongoing system services. When it runs as PID 1, it receives control after the kernel hands off to userspace. It then activates the configured boot target and the units drawn in by that target’s dependencies. The exact configuration varies by distribution and machine; there is no single universal startup environment.
Rather than treating startup as one fixed list of commands, systemd queues requested state changes as jobs and uses unit dependencies to coordinate them. Units can be active, inactive, activating, or deactivating. Programs launched under systemd are tracked in per-unit Linux control groups, which helps the manager account for the processes belonging to each unit.
This is the useful level of detail for understanding systemd’s boot role: control passes to systemd, which activates the configured target and its related units. The precise stages before that handoff and the distribution-specific boot sequence are outside this overview.
Free tools Windows power users keep installed
One-click scans. No signup required.
#1 Best Overall
- 12th Intel Alder Lake N95 Processor – The GMKtec G3 S Mini PC is powered by the 12th Gen Intel N95 processor with 4 cores, 4 threads, 6MB cache and a burst frequency up to 3.4GHz. Compared with N100/N5105/N5100/N5095, the N95 delivers up to 36% overall performance improvement. Perfect for routine tasks, office work, and home entertainment, this compact mini desktop is more convenient than traditional bulky PCs.
- 8GB RAM & 256GB SSD Storage – Pre-installed with 8GB DDR4 memory and a fast 256GB M.2 2242 SSD, the G3 S mini desktop offers quicker startup, smoother multitasking, and faster file transfers. Enjoy seamless performance whether you’re working on multiple applications, browsing, or streaming content.
- Rich Interfaces & Connectivity – The G3 S mini computer comes equipped with USB 3.2 (up to 10Gbps), dual HDMI 2.0 (4K@60Hz), and a 3.5mm audio jack. With support for WiFi 5, Bluetooth 5.0, and Gigabit Ethernet (RJ45 1000MbE), it connects easily with monitors, projectors, printers, office equipment, and other peripherals, making it versatile for both home and business use.
- Dual 4K Display Support – Featuring upgraded Intel UHD Graphics (up to 1000MHz), the G3 S supports 4K video playback and AV1 decoding for a smooth viewing experience. With dual HDMI outputs, you can connect two 4K@60Hz displays simultaneously, enabling efficient multitasking for work and entertainment.
- GMKtec WARRANTY - GMKtec offers a 1-year limited GMKtec's warranty for each mini PC, starting from the date of the purchase. All defects due to design and workmanship are covered. With a professional after sales team always ready to attend to your needs, you can simply relax and enjoy your mini PC.
What is a systemd unit?
A unit is an object systemd can manage. Services are one familiar kind, but units also represent other things relevant to boot and system maintenance. A unit may be loaded from configuration, generated from other configuration, derived dynamically from system state, or created at runtime.
Unit files describe the object and how it relates to other units. Those relationships let systemd determine which units are requested and coordinate when they run. Many dependencies are implicit, so adding directives indiscriminately can create unnecessary or misleading relationships.
What is the difference between a target and a service?
A service unit describes a service that systemd can manage. A target unit is primarily a grouping and synchronization point: it brings together other units through dependencies and can mark a broader point in startup. A target is not simply a service with a different name.
Two common boot targets illustrate different intended environments:
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Rank #2
- 【AMD Ryzen 3 5300U CPU: Outperforms N150 & 3500U】 BOSGAME E5 mini PC is powered by the TSMC 7nm FinFET architecture AMD Ryzen 3 5300U processor (4 Cores, 8 Threads, up to 3.8GHz boost, 6MB total cache). Compared to low-end Intel N150 or 3500U chips which only have 4 single threads and throttle under load, the 5300U delivers over 30% faster multi-core speed. Run 30+ browser tabs, large Excel sheets, and Zoom meetings simultaneously without system lag.
- 【8GB DDR4 RAM & 256GB NVMe SSD Storage】 Installed with high-speed 8GB DDR4 dual-channel memory and a fast 256GB M.2 2280 SSD, eliminating slow boot times and application loading delays. To accommodate growing data requirements, the upgradeable hardware design features dual SODIMM slots that allow you to expand memory up to 64GB RAM, ensuring smooth operation during heavy multitasking.
- 【High-Capacity Dual M.2 SSD Storage Expansion】 Never worry about running out of space for your business files. In addition to the pre-installed 256GB system drive, the motherboard houses an extra empty internal M.2 2280 NVMe PCIe 3.0 slot. This allows you to easily add a second solid-state drive for up to an additional 2TB of storage capacity (upgrades not included) without needing to remove or reinstall the original operating system.
- 【Radeon 6-Core Graphics & Triple 4K Displays】 Integrated with official AMD Radeon Graphics (6 Graphics Cores, 1500 MHz frequency) for casual gaming, photo editing, and crisp 4K media decoding. Featuring 1x HDMI 2.0 port, 1x DisplayPort, and 1x Full-Function Type-C port, the E5 outputs true 4K@60Hz resolution to three monitors at once. This multi-screen setup eliminates constant window-switching for traders, programmers, and office workers.
- 【Dual 2.5GbE LAN Ports for Advanced Networking】 Experience fast wired network transmission speeds up to 2500Mbps without lagging or buffering. The integration of dual 2.5 Gigabit Ethernet ports (powered by Realtek RTL8125 controller) makes this compact computer an exceptional hardware choice for tech enthusiasts. Easily configure it into software routers, hardware firewalls (pfSense, OpnSense), home NAS servers, or local homelabs.
| Target | Common purpose | What determines the actual result |
|---|---|---|
graphical.target |
Full graphical environment | The target’s dependencies and the machine’s configuration |
multi-user.target |
Console-oriented multi-user system | The target’s dependencies and the machine’s configuration |
These are common choices, not a guarantee that every distribution or installation uses the same target or brings in exactly the same units.
What is default.target?
default.target is the target systemd activates for normal boot. Its dependencies pull in the units intended for that system’s ordinary startup. It commonly aliases graphical.target on a desktop system or multi-user.target on a console-oriented installation, but administrators can configure a different target.
To inspect the configured default target or change it, use the commands documented by the systemctl manual. Check the manual for your installed systemd version, since available options and local configuration can differ.
What is the difference between Requires= and After=?
They describe different dimensions of a relationship. Requires= expresses a requirement: one unit requires another. After= imposes startup ordering: the unit named by the directive is ordered before the unit containing it. An ordering directive alone does not pull the other unit in.
Rank #3
- 【1-Year Worry-Free Warranty】Your satisfaction is our priority. Glorlin provides a 1-year warranty covering any hardware malfunctions. We support returns or exchanges to ensure a 100% worry-free shopping experience. Have a question? Reach out to us through our official after-sales email for a prompt solution.
- 【Reliable Performance with Ryzen 7 Processor】Powered by AMD Ryzen 7 8745HS (8 cores, 16 threads, up to 4.9GHz), this mini pc delivers stable performance for daily workloads. Suitable for office tasks, programming, and multitasking, it works well as a ryzen mini pc for both home and business use.
- 【Radeon 780M Graphics for Media and Light Gaming】Equipped with integrated Radeon 780M graphics, this mini gaming pc supports smooth 4K video playback and handles many popular games at adjusted settings. A practical mini computer for media, editing, and casual gaming.
- 【Mini PC 16GB RAM and Fast Storage】This mini pc 16gb ram configuration includes single 16GB DDR5 memory (4800MHz，3GB is assigned to VRAM by default) and a 1TB NVMe SSD, offering quick boot times and responsive system performance. Dual M.2 slots allow storage expansion up to 4TB for growing files and projects.
- 【Quad 4K Display Support for Productivity】The mini desktop computer supports up to four 4K displays via HDMI, DisplayPort, and dual USB-C ports. Ideal for multi-screen workflows such as coding, trading, or content creation with improved efficiency.
| Directive | What it expresses | What it does not express by itself |
|---|---|---|
Requires=foo.service |
A requirement relationship with foo.service |
That the requiring unit must start after foo.service |
After=foo.service |
Order this unit after foo.service when both are being started |
A requirement that foo.service be started |
If both units are requested and there is a requirement relationship but no ordering relationship, systemd can start them in parallel. To require a unit and impose ordering, the unit configuration needs the appropriate relationship for each purpose. Consult the systemd unit manual for exact directive semantics, including failure behavior; the two directives should not be treated as interchangeable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does After=network.target mean the network is ready?
No. After=network.target expresses ordering relative to that target; it does not guarantee that a network connection is configured or usable. The systemd documentation for rc-local.service says a script that needs a configured connection may need to pull in and be ordered after network-online.target. The behavior of that target depends on the network service implementation in use.
For a service with a real network-readiness requirement, use a proper unit file with dependencies suited to that requirement rather than assuming that network.target means connectivity is ready. The same documentation advises against relying on /etc/rc.local where a correctly configured service unit is appropriate.
What is the difference between enabling and starting a service?
systemctl start requests activation now. systemctl enable arranges for a unit to be activated from suggested activation points, typically as part of a later boot or another relevant event. They are orthogonal: enabling does not itself start the unit now, and starting does not by itself enable it for future activation.
- Use
systemctl start name.servicewhen you want to request that service’s activation now. - Use
systemctl enable name.servicewhen you want to arrange its activation at the relevant configured activation points. - Use
systemctl list-dependencies name.targetto inspect units required or wanted by a target or other unit.
For exact command options, dependency inspection, and default-target management, see the systemctl manual.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
