We couldn't create a new partition or locate an existing one

You’re trying to create a new partition during Windows setup or disk management, and instead of success, you get that annoying “We couldn’t create a new partition” error? Ugh, I’ve been there — it’s super frustrating. 

From my experience, the main downsides or disadvantages if you’re stuck with that error are:

1. Basically, you’re stuck with your current setup. If you need space for a new OS, data, or a separate drive, you’re out of luck until you fix it.
2. Sometimes people get desperate and try to delete or format partitions manually, which can lead to accidental data loss or corruption.
3. Without creating new partitions, you might be stuck with a cluttered main drive, which isn’t ideal if you want to keep things organized or dual-boot.
4. If you’re trying to install Windows or set up a new drive and can’t partition it properly, that can halt your progress completely. You might have to go through extra steps to fix it, like converting between MBR and GPT or cleaning the drive.
5. Sometimes, this error hints at underlying problems like a corrupted drive, bad sectors, or incompatible partition styles.

If you get that "We couldn’t create a new partition" error, you’re basically limited. It stops you from creating more space or organizing your drive the way you want. The fix involves troubleshooting (like checking drive format, removing conflicts, or cleaning the disk), but until then, you’re kind of stuck. So, it’s best to handle it carefully — don’t rush, back up your data, and try to understand what’s causing the problem before proceeding.