While installing and using Nalbantov drives in grand Disklaviers, I’ve encountered a recurring problem. The full-size USB sticks protrude too far, and are easily damaged by pianists or passerby.
Lately, I’ve had good luck using the SanDisk Ultra Fit 32 GB 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 that anything is plugged in.
Below, you can see a USB stick the was struck laterally by a pianist. The solder joint snapped right off! That is an in convenience easily avoided by a good quality, low profile USB stick.