The whole ‘does an Android smartphone need expandable storage’ debate has been raging for many years and it has been a real roller-coaster of a ride. One year Samsung’s flagships have microSD card slots, the next year they don’t, then support is back again. Up and down, up and down. Google never seems to want to include microSD card support in its Nexus line, but the individual OEMs who manufacture the Nexus devices do include support on other handsets they make! If you do have a smartphone that does include a microSD card then one of the first questions you are likely to ask is this: What is the highest capacity microSD card that I can use on my phone? And it is a good question, but the answer may not be as simple as you were hoping.

To get to the bottom of this we are going to need to look at the different microSD standards, the different file systems supported by Android and by desktop OSes like Windows & OS X, plus we will need to take a peek into the murky world of patents. MicroSD cards and the SD Association Let’s start with the basics. The standards for SD cards and microSD cards is defined by the SD Association.

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It was set up in 2000 by Panasonic, SanDisk and Toshiba to develop and promote memory card storage standards. Basically the SD Association makes sure all SD related technology (readers, cards etc) are compatible. At present there are three standards when it comes to the capacity of SD and microSD cards. Type of card Max Capacity File System Backwards Compatibility SD 2GB FAT32 SD SDHC 32GB FAT32 SD, SDHC SDXC 2TB exFAT SD, SDHC, SDXC So basically the original SD card standard supported cards up to 2GB. Then came SDHC which extended the capacity to 32GB and then more recently the SDXC standard was released to boost the capacity to 2TB.

All the standards are backwards compatible, which means that a device with a SDXC support can use all three types of SD card, but a device with a SDHC support can only read SDHC and SD, but not SDXC. When it comes to handsets you may have noticed that some OEMs will says something like this, “expandable storage via microSD card up to 32GB.” what that probably means is that device has a SDHC compatible card reader. Technically any Android device which supports SDXC could advertise “expandable storage via microSD card up to 2TB.” But because 2TB microSD cards don’t exist (yet), most OEMs will say something like “expandable storage via microSD card up to 128GB” where the “ 128GB” bit could be a different capacity depending on when the device was released and what is the highest current microSD capacity that is commercially available. FAT32, exFAT and Microsoft As well as defining the physical characteristics of the memory cards, the SD Association also recommends how data is stored on the cards. If you imagine that the SD card is a block of storage space, any device that wants to read a file from that block needs to know where the file starts on the block and where it ends. It needs to be able to find that data from the file name (actually the full path name) and it also needs to know some information about the file’s permissions, etc.

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