Sandisk Ultra 64gb MicroSD Wont format.

[duke69]

I had a similar problem. I have a Galaxy S3 and was able to format it through the phone fine. but when I plugged it into 2 diferent computers, XP and Windows 7, it would not format correctly I had 72-1 reader I bought a year ago that read all sd cards, even the new 32GB cards. But found out finally that is was still to old for the new 64GB cards. I purchased the (SDDR-289 reader) and now I can use my 64GB card anywhere I go. Only formatted once on the phone. Then it was plug and play on the computers and they instantly reconized the card at 59.47GB capacity. Hope that helps.