I may have been able to fix that 16 GB micro SD card: an app called Spacie was able to delete the movie file& other guff (I normally use it to locate excessively large files). I added another movie file to it & it hasn't (yet) been rejected & replaced with the original one.
I have a buggered micro SD card. I tried reformatting it using Disk Utility on the Mac & from the recovery drive. Alleged success from the latter. Tried formatting it in two digital cameras, no go. Used DiskWarrior Recovery Maker to reformat it as a DiskWarrior startup drive. Allegedly successful. But no: each time I finish doing something to it, it reverts to having one movie file on it. I can't even trash the file, trying to do so brings up this error:

@jextxadore And very fine cheeses. Must no forget the cheese.
// @matigo @hybotics
Glue, steri-strips & a thick bandage (to reduce joint movement) put on one finger by the nurse. That aches and stings at the same time. Just a few more plasters on the razor blade injury, it's closed up OK.
I guess the is a variation on natural selection. http://www.9news.com.au/world/2017/06/30/01/54/us-woman-kills-boyfriend-in-youtube-stunt-gone-wrong
@joeo10 I had to activate VPN to see that article: I was initially directed to the gizmodo.com.au site.
Wanted a particular old movie. Was cheaper to buy the DVD locally than to rent from either iTunes or Google Play store. Just got an email from the store confirming it's ready for pickup.