It should be 2 GB each.

 

A while back, I purchased 2 Transcend 4GB SD cards (133x). Actual capacity is 3.74GB.

I checked one of the disks info today. The used space is 3.24 GB's, the free space is 515mb. On the card I have 23 folders with 220 songs plus 90 individual songs. 333 items total. All folders and songs that are on the card show up on the stereo. Is it a fluke, I don't know, but I am using well over 2GB's.

One oddity I don't understand: After I insert the cards (while the face is still lowered) the display reads '384mb'. Not sure why...

 

jcodol - would leave to hear about your setup. I can't put more than ~2GB on this 4GB

My setup:
07 A3 with NAV
Transcend 4GB 133x: http://www.amazon.com/gp/product/B00..._ya_oh_product

Computer Sees:
598 Files
47 folders
just under 4GB used

Audi sees:
just 2.42GB of the above files, basically it sees all root files plus all folders until about P which totals 2.42GB

nevermind that it takes over a min to load!