My laptop already runs Ubuntu, but I need Windows for school software such as SolidWorks or other CAD applications. The laptop currently has one storage drive, although it may support a second one. Is it practical to shrink the existing Linux partition and install Windows afterward, or would it be safer to replace Linux with Windows? I'm also considering a virtual machine, but I'm not sure whether CAD software would run well that way.
4 Answers
A second drive is generally the least troublesome option. Install each operating system on its own drive; many people disconnect the Linux drive while installing Windows so the installer cannot modify its partitions or boot files. Afterward, both drives can usually remain installed, and you can select the operating system through the firmware boot menu or a bootloader.
Installing Windows first and Linux afterward is usually simpler because Linux installers normally detect Windows and add it to the boot menu. Installing Windows second can still work, but you should expect Windows to take over the boot process. If you only have one drive and don’t want to troubleshoot partitions or boot files, backing up your data and reinstalling both systems—or using a second drive—is safer than doing it casually.
Dual-booting on one drive is possible, but it requires careful partitioning, backups, and bootloader repair afterward. Windows may replace the existing Linux bootloader during installation, so you might need to restore GRUB or another boot manager. If you choose this route, make a complete backup first and avoid installing until you understand the recovery steps.
Before committing to Windows, find out exactly which applications your courses require. For a light Windows-only program, Wine or a virtual machine might be enough. VirtualBox is relatively easy to set up, but demanding CAD programs can need substantial RAM and graphics performance, so a VM may not provide the same experience as running Windows directly.

My laptop has two storage slots, so I’ll compare the cost of another drive. If both drives have their own operating system, can they stay installed at the same time?