Perfect USB stick for car radio

Much I do not say this:
Write and read rates, one should not expect a lot now.
For car stereo with USB port it is perfect because otherwise times fast a person with handbag, knee and co could a larger turn.

WITZIG !!!:
In reality, a 4GB micro-SD is incorporated and the case is a very small card reader xD
=> Is if times but then requires a memory card xD