Unreasonable reset is occurred during SD card tick; SD card connection

when SD card connects, unreasonable reset is occurred under USB plug-in is powerred; not under SMPS powerred.

It is because of power bounce (my schematic does not have capacitor from VCC and GND in SD parts). So I insert capacitor between SD card's VCC and GND. power bouncing is not any more occurred. Above all, it is careless.