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I bought an SD card of 64 gb for my Razer Phone 2 and I'd like to transfer big data in it (Spotify songs, videos, useless apps). I can't find any option to safely move data from my phone to the SD card. On top of it, i inserted the card, l installed it as memory extension and, out of nowhere i filled up 20 gb on it!! That is, my phone continues to have 97% of usage data plus 20 more GB on the SD card created apparently from thin air. How's it even possible? Did google just transfer there stuff, what criterion did it even use?

I downloaded an app 'files to SD card' which could do the transfer, however when selecting the root of the SD card it returns me the following message : 'no root directory has been selected'. I am afraid my card has been installed as extension of the SD card and thus cannot be used to transfer data from the phone to the SD card. However, after the creation of the 20 additional gb, i am afraid of reformatting the SD card to reinstall it differently. Hope this is clear enough

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To have control, you need to configure the SD card as Storage and not Expansion. Not all phones offer these options automatically and it is possible you have to switch it. Changing modes, wipes data on the card since it gets reformatted.

Once you the SD card is configured as Storage, you can use it to store Data but generally not Apps, at least on most recent official versions of Android. However, many Apps that expect to produce or manage large data have the option somewhere to configure where that data is stored. This includes the Camera App, since it is expected that it can capture huge volumes of photos and videos, Netflix, Amazon Prime, Maps.ME and many more, but those are the ones I know and are configured on my current phone.

For applications that are media players, such as VLC, then generally you can place media yourself in any folder that could be on the SD card or in internal memory. You can place all your videos and audio in the SD card and then either navigate to where you want to open media or add folders on your SD card to their 'Media Folder' list. Technically, you can add the entire card but if it is huge, scanning it will take a long time, so it is preferable to create yourself a folder structure by media type. Note that you will have to grant permissions to modify the SD card for each application you want to use that way.

When you installed the card as memory extension, I am surprised that much data appeared but generally, the process involves creating some cache. Before you erase that, do take a look to see what those files are using the file manager. There should be mostly hidden files (starting with a dot) and folders called 'cache' or similar.

Note that modern Android phones mount SD cards by their Label which means that when you swap SD cards, most applications will no longer find their data and revert to internal storage or show an error. Ideally, there would be a way to mount the SD card in a fixed mount-point (but I have not figured out how to do this. It is likely to be possible since all phones so far have a single SD-slot, so they could give it a fixed path) but if you use a cloning tool (or just dd on Unix), then you can backup an SD card so that it has the same label. This is not so important but there are some apps that once they do not find their data, force you to redownload it, even if you put back the same SD card again later and point them to the same path (MAPS.ME does this).

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  • Hi there, I reformatted the SD card as storage. Now everything worked. As for the extension, it was media copied from the phone to the SD card, thus I had double the data. I do not have sophisticated apps so I have not seen an impact on the configuration of the apps as per your answer. Lastly, after Android 9 the SD cards are encrypted so it is difficult to read them unless decrypting them. To decrypt them you need to deselect the encryption option at the very beginning of the configuration (which is not what I did), this is for future references. cheers Aug 23 at 22:14
  • I have just checked if I could select the option to not encrypt the SD card on another 2gb spare card I had. I have not found it and I guess I am giving up for now on that option. Sorry Aug 23 at 22:30

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