How to disable Low disk space for ReadyBoost dedicated drives on Windows 8.1?

I've enabled a disk partition of around 8 GB to be dedicated for ReadyBoost.

Windows keep waing me about that disk ruing out of space (Low Disk Space).

How do I tu off that waing for THAT disk and ONLY that disk.

I DO want that waing, I do not want it for that disk I specifically instructed windows to completely fill.

I find it absurd that a Windows feature meant to completely fill a disk cause an aoying waing that you can't disable.