Unhappy [Q] [GT-P3100] Problem with mounting USB flash with OTG cable

i have a GT-P3100 with CM11 (cyanogenmod) (kitkat 4.4.2) on it.
when i plug a OTG cable with USBdisk to my tablet it works properly at first.
but if i suddenly unplug USB flash without un-mounting it from setting->storage it will not be mounted again and i have to reboot tablet to OTG working again.

is there a way to manually preparing SD card ( usbdisk) ?