I built a new Windows 11 PC a few months ago using individually purchased parts, but it has been sluggish from the beginning. A friend noticed that the disk usage stays at 100% much of the time. The system has an Intel Core i5-12600KF, a Gigabyte Radeon RX 9060 XT 8GB, 16GB of Corsair Vengeance DDR4-3200 RAM, an MSI PRO B760-P WIFI DDR4 motherboard, and a 2TB WD Red Plus mechanical SATA hard drive. The operating system is currently running from the HDD. A friend has experienced a similar issue on a laptop with an SSD, so I'm wondering whether the drive, limited RAM, Windows services, or something else is responsible. What should I check, and what upgrade or fix would make the biggest difference?
4 Answers
Windows 11 can use the pagefile when it needs more memory, and paging is painfully slow on a mechanical disk. Your two 8GB memory modules give you 16GB total, which is usable but can become limiting with demanding programs. Check the Memory section in Task Manager; if it is often close to full, upgrading to 32GB may help. However, adding RAM will not make an HDD perform like an SSD, so moving the operating system to an SSD is still the best first step.
The biggest bottleneck is the mechanical hard drive. A WD Red is intended more for storage or NAS use than as a Windows boot drive, and a 5400 RPM HDD is especially slow for an operating system. Windows constantly reads and writes small files, so the drive can remain at 100% active time even when the actual transfer speed looks low. Install Windows on an SSD—an affordable 256GB or 1TB SATA or M.2 SSD would work—and keep the HDD for large files and backups. The improvement should be dramatic.
The HDD is the main issue, but 16GB of RAM can also cause paging under heavier workloads. An SSD should come first, then consider 32GB of RAM if memory usage is regularly high.
Check which process is causing the activity before changing services. Open Task Manager with Ctrl+Shift+Esc, then use the Performance tab and open Resource Monitor. On the Disk tab, sort by total read/write activity and look for Windows Update, antivirus scans, indexing, a specific application, or paging activity. This can distinguish normal background work from a failing or overloaded drive.
You can test in Safe Mode to see whether third-party startup software is involved. Also check the drive’s health with a reputable SMART monitoring tool and make sure important files are backed up. Avoid randomly disabling Windows services or applying aggressive privacy tweaks as a first step; identify the workload first. If the disk is reporting errors or unusually high response times, replace it rather than trying to tune it.
An SSD can also reach 100% usage if a process or pagefile is constantly active, so the percentage alone does not prove the drive is defective. Look at the process list and response time as well.