Default [Q] CWM Doesnt work on bigger microsd

I have Prestigio Tablet Multipad PMP5580C DUO. I don't understand why can't I enter cwm from Micro sd card (Sony Microsd HC, 16GB I 40MB/S Class 10) SR-16UY but I can with SAMSUNG microsd 2gb. Both cards are FAT32 formated.?????????

This Rom is on Tablet - CyanogenMod 10.1 for Prestigio PMP5580C Duo (build by Christian Troy, port by nnlynx)