Discover nav (std) some MP3 questions

[homerjh]

Just re-ripping my mp3's as tried some 320 CBR in my B7 and they sounded really good, so starting earlier than i was going to. I was using 192 currently and there was a noticeable quality difference, but then again may just be placebo.

As i will have the budget Discover model (;) ) it doesnt play flac (well mp4, which also is used for films) so ripping at 320 CBR on windows media then cleaning up the tags with mp3tag and embedding the cover into each MP3. I was looking at WAV for the quality but the size difference (170Mb vs 650mb) was too large and wanted tags for easier ID.

So a few questions :

1 - Does the std discover display cover images and is this embedded ones? i know the pro has the jukebox feature but that is just internal storage over using an SD card.
2 - What is the mp3 navigation like, is it per folder or by tag? on my b7 it uses folders and you had to scroll through, displaying 2 at a time.
3 - does the 'random' function work properly? as on my B7 (dont know the radio number, but has bluetooth/dab and ipod/usb inputs) with USB it only plays randomly for a small number of folders on the mp3, so may only randomly play 'all' to up to folders beginning with E and no further.
4 - What SD cards are you all using? i am anticipating 32Gb minimum, likely 64Gb as the price difference is minimal and this should cover all my needs as over 300 albums

ta