I'm planning to switch from Windows to Linux, probably CachyOS, but I want to keep my current Windows installation as a fallback while I learn. My setup has an NVMe SSD containing Windows and applications, a SATA SSD for games, and an HDD for files, films, and other bulk storage. All three drives currently use NTFS.
My idea is to divide the NVMe into Windows and Linux partitions, update Windows to a stable version first, and then avoid making further Windows changes that might interfere with the bootloader. I could erase and reformat the SATA SSD, but I would prefer to preserve the data on the HDD. One possibility is to shrink the existing NTFS partition, create a shared filesystem in the freed space, move data across gradually, and repeat until the disk is migrated. Another option is to temporarily move the HDD data to the SATA SSD, reformat the HDD, and copy everything back, although I'm not sure the SATA SSD has enough free space.
Is this approach practical, or is there a safer migration plan? I can obtain temporary storage if necessary, but I'd prefer to use my existing drives. I'd also appreciate advice on testing Linux first, dual-booting reliably, choosing filesystems that both operating systems can use, and avoiding bootloader problems with an MSI motherboard.
4 Answers
For files that genuinely need to be accessed by both systems, exFAT is simple and widely supported, though it lacks Linux filesystem features and journaling. Keeping Linux-only data on ext4 or another native Linux filesystem is generally preferable. NTFS can be usable from Linux, but avoid sharing an actively mounted Windows system partition, and disable Windows Fast Startup or hibernation before accessing shared NTFS data from Linux. Also keep the operating systems on separate partitions or drives rather than trying to share program installations.
Your gradual migration idea can work, but resizing and moving partitions repeatedly is more complicated and increases the chance of a mistake. A temporary drive with enough capacity for the HDD data is the cleaner solution: back everything up, reformat the destination with the filesystem you choose, copy the data, verify it, and only then erase the original. Don’t treat a filesystem conversion or partition resize as a backup.
Make a complete backup of anything important before changing partitions. Ideally, keep at least one separate copy that is disconnected during the installation. If you can add another NVMe drive, installing Linux on that separate drive is the safest arrangement: temporarily disconnect the Windows and data drives during installation, install Linux to the new drive, then reconnect everything and select the desired system from the UEFI boot menu. This avoids accidentally overwriting Windows and makes removal or recovery easier.
Before repartitioning anything, test whether Linux actually fits your needs. Run CachyOS from a live USB to check Wi-Fi, graphics, audio, touchpad, controllers, and other hardware, then consider using it in a virtual machine for a while. Also check the applications you rely on, since some may need Linux alternatives or a compatibility layer. For games, verify compatibility individually because support varies by title and launcher. Once you’re confident, dual-booting becomes much less risky.
That makes sense. I’ll arrange enough temporary storage first rather than relying on repeated shrinking and copying.