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I recommend a fast U3 MicroSD card for use with the Dell Inspiron 5391 I put it back in my 5391, still the same problem. I tried the same card in an Android smartphone, it worked fine. I tried the same card in another computer and it read it without problem. Formatting the card was taking minutes and eventually I had to reboot my PC. I tried to set up Windows File History, it gave the error "Could not enable File History". Copying files was like watching a video in slow motion. However, when I tried to use it, my computer, in general slowed down. I plugged this MicroSD card into my 5391 and it appeared as a drive, all appeared normal at first. As I was only backing up files to it, I felt I didn't need more. I have used these cards before, they are inexpensive and a reasonable speed. I wanted to use a MicroSD card for backup.
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It's a high-spec but reasonably priced laptop (as of November 2019), I'm very happy with it. Recently I bought a shiny new computer, the Dell Inspiron 13 5391.
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