If you have a car stereo with an SD card slot you can play the music directly from it so you don't have to use bluetooth or an aux cable. Now you can get all sorts of memory card sizes but the best SD card for music in your car doesn't really matter. The quality of the mp3 files is more important such as the compression size and the kbps. An 320 kbps mp3 track will sound far better than one that is at 128 kbsps but it will be a larger file size due to containing more information in the audio file. Now before purchasing its important to find out what the maximum recommend size is. This is because some don't accept a SD memory card that is too large for it too handle as this can cause stability issues with playback. Once you have it you will need to format the SD card to the correct type in order for it to work with your car stereo. All you need for this is a computer and a memory card reader of some sort.
1) Insert your SD memory card you want to format into your computer in the card reader.
2) Allow the PC to recognise it.
3) Go into my computer, right click on it and select format.
4) Select the formatting type to FAT 32 as this is what is used to read SD cards in your car stereo.
5) Click format it should be done in a couple of seconds.
6) Upon completion you can now copy over your mp3 tracks to the root of the memory card, it will now work with your car stereo and will be able to read it without no problems.
Some players require specific settings. I'm trying to look for individual settings like block size etc. I will play with them all which arent a lot and see which one works with the car stereo. Currently when I format with FAT 32, it uses the default block size and the stereo doesn't read any file up to a certain point and other units say files are corrupted up to like song 120 and have double files for each song. When you put the sd card back into the PC they read perfectly normal.
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