Do you have an adapter & a card reader? I know you said it's a known good card, but have you tried plugging it directly into your computer & putting a picture or something that the tablet could read on there?
Just wondering if the tablet is seeing the card, but can't read it, or if it's not seeing it at all.
Kaos' request to see the SD card in storage songs might also help determine this.
Sent from my SCH-I545 using Tapatalk
Yes, I have an adapter. Last time I tried this, I had transferred a bunch of music to it, but once I placed back in the tablet it said it needed to be formatted (tablet couldn't read it). Interestingly enough THIS time it worked!
I still need to get it working when the tablet is connected though because I have it in an Otterbox protective case, and do NOT want to have to take it out of this case anytime I need to transfer to this card (should not have to do this). Either way, at least I did make a LITTLE progress! (oh, and yeah before anyone asks the obvious, yes I did try to reformat numerous times)