Walt
I own the Samsung Galaxy Tab 2 10.1I bought the 64g microSD card..(please keep in mind I know NOTHING about computers and I was able to do this.)I put it in the device to format...the tablet couldn't read it.  Would never mount.  Tried to format it with my computer....and still just wouldnt work..although it would be formatted.  Remember, I was using all defaults.Sent it back, Amazon sent me another one. (Amazingly fast service)...same thing.I called Amazon...they knew of no issue why my tablet wouldn't accept the card. (I would think that their customer service dept. would stay on top of these posts because I found that this was a HUGE issue)On my THIRD card I did some research.  For whatever reason for this SD card to work it must be formatted as a FAT 32 NOT an exFAT.  BUT...(this is the rub)...windows only allows for formatting either to exFAT or NTSF...(at first, I thought it was an adult swim reference).....so....that sucks....this means that I can't use this card because I can't format it properly.  But wait..there's more....there is a super easy fix....any idiot can do it.....from start to finish took me all of 45 seconds (after reading instructions)...and ta-duh.....now the micro SD card works fine. Thank-you Amazon for your excellent return policy..(super fast, super easy, super friendly)...BUT your live customer service should know about this.  I can't fault the operator...she was nice..seemed genuinely concerned and tried to make it right)...ok.. no more stalling..here is the address of the youtube video.  link to website is in the description.[...] ...link to website in description.  I used all defaults and worked perfect.  or search youtube - convert fat32