![]() I could copy data to it, but it wasn’t detected by my ASUS Slider. So I had no choice but to format it again, but this time to NTFS. I couldn’t rename, delete, move or copy any files on the card. The card didn’t disconnect itself, so I tried to copy more data onto it.īut the second time I connected it to my computer, it suddenly switched to read-only mode. I then copied about 30GB of data to it, all seems well. To my surprise, my second device, the ASUS Eee Pad Slider, could mount and read the 64GB exFAT card. The second card I didn’t risk formatting to FAT32. I have tried multiple readers, multiple computers and multiple OSes, all of them yielded the same “Automatic Unmount Syndrome”. The card disconnects itself whenever I try to format it or copy files onto it. ![]() Windows said that it was unable to complete the format. The card still showed up on my computer, so I tried to format again. My phone would say “Preparing SD Card…”, then it would disappear very soon after. The first card died immediately when I inserted it into my Samsung Galaxy S2. Knowing exFAT doesn’t work on either of my mobile devices, I then proceeded to format one of my cards to FAT32 so it would actually mount in my devices. They only work on a select few, namely those with unlicensed exFAT support such as the Samsung Galaxy S3, Note 2, Note 10.1 and various others. Misleadingly enough, SanDisk’s 64GB “Mobile Ultra” MicroSDs don’t actually work on any Android device. Initially all was fine with the cards they both mounted properly, were formatted using exFAT by default and showed a 59.46GB capacity. This streak was broken when I intended to purchase one for my phone and one for my tablet. I have a 64MB (yes, megabytes), two 2GB, a 4GB, 8GB, 16GB and a 32GB MicroSD card, all of which perform very reliably. ![]() In fact, I’ve only ever used SanDisk MicroSDs. I find SanDisk to be a very reputable brand - I haven’t had any problems before with USB flash drives and other MicroSD cards. I bought two SanDisk Mobile Ultra 64GB USH-I cards.
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