What happens if you connect a dual USB flash drive to two devices (for example, a laptop and a tablet) at the same time?

I'm interested in whether you can access the memory at the same time (read / write). If this does not work at the same time (as I expect) … Can I access the stick if the other device is still connected and switched off?

Dual states only that this thing has two different plugs and you can only use it with one device…

Thanks, I thought so. If one of the devices is off, can the stick be recognized by the other device? Or does the off-device interfere with access?

Must you try that someone has 2 devices at the same time I never heard…