While installing and using Nalbantov drives in grand Disklaviers, I’ve run into a recurring problem. The full-size USB sticks protrude too far, and are easily damaged by pianists and passerby.
Lately, I’ve had good luck using the SanDisk Ultra Fit USB Flash Drive. I typically couple that with some brightly colored cord. Because I have a lot of it handy, I use Atwood Micro Cord, but any brightly colored cord will do. I like to tie the end in a Lanyard (Diamond) Knot.
This hardly protrudes at all. Without the cord, it’s difficult to even tell anything is even plugged in.