sd card size display is 3.65 but i do have games installed.Emunand its a partition on your SD that acts as a Redirected Nand, so nothing its installed on your system, you might have A9LH, but i do need to know if you have emunand or not. to check if you have emunand, you can easily put your SD card on you PC and tell me how much storage its displayed.
If your SD card its 4gb, it should display 3.6gb on yoru pc., if you have emunand, it wil display 2.6, since the redirected nand clones the real nand. so if you got anything lower than 3.5gb, you do have Emunand, else, you dont.
if you went from stock to cfw using the 3ds.guide, then you dont have emunand.
If you went from Menuhax to cfw you might have emunand.
yes i used 3ds.guide to downgrade and install CFW