It will work fine with 64GB SD cards that are formatted for it. UConnect doesn't seem to actually care about the card size, but it doesn't recognize other formats. The issue is that most cards over 32GB are formatted NTFS rather than FAT32. And Windows doesn't want to format anything larger than 32GB in FAT32 format. There are programs you can get from the web to do it, though. So you can buy any 64GB card and just reformat it if you want. There's a decent writeup here.
Heheh. Yeah, technology for you. Another guy found that he could partition his 64GB card into 2 32GB partitions and Windows will format it with FAT32, and Uconnect recognizes both partitions.
The problem here is that Microsoft pretty much forced the FAT32 standard on the industry. Every peripheral maker had to maintain compatibility with it. Now that storage density is increasing, Microsoft's switching to NTFS. But in the meantime Microsoft sued TomTom (GPS) over support of FAT32, which comes with Linux that's embedded in the GPS. The reason for the support in GPSs is so that you can carry data from your pc out to your GPS, and the GPS can use it.
They've done the same to a number of smartphone vendors, and other companies with embedded FAT32 support. Now Microsoft gets around $20 per, for every Android phone sold. It's understandable that other companies don't want to help Microsoft.
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