Can I install CachyOS on a SanDisk drive if my Windows SSD is running slowly?

Linux can run from almost any storage device, including a SanDisk USB drive or external SSD. A USB flash drive will work, but it’s usually slower, less durable, and requires a persistent storage setup if you want installed programs and saved changes. An external SSD is a much better choice for regular use. You can also install Linux directly to a separate internal drive if your computer has room for one.

I’d be cautious about making CachyOS your first Linux installation. It’s based on Arch and can require more troubleshooting than beginner-focused options such as Linux Mint. You could test CachyOS in a virtual machine or boot it from a live USB first, then decide whether you want to install it permanently.

The slow Windows write speed probably won’t slow down Linux if Linux is installed on a different, healthy drive. However, 20 MB/s is concerning for an SSD. Check how much free space is left, confirm that TRIM is enabled, review the Windows power plan, and check the drive’s health with a SMART utility. Back up important files before experimenting, since a failing drive can get worse.

For dual booting, make sure you have a current Windows recovery or installation USB and back up your files. Be especially careful when selecting partitions during installation so you don’t overwrite the Windows EFI or recovery partitions. It’s also worth reading a reliable dual-boot guide and using a partitioning tool such as GParted only when you understand which partition you’re changing.