Q. In an attempt to work out why my microSD card was full, I connected my smartphone to my Mac in 'Disk Transfer' mode. Aha - I found a load (Gigabytes!) of old music files from when I used to sync my phone with a Windows PC. I then deleted the root directory containing all these files and.... it seems that the disk is still full! Obviously, there's something going wrong in the counting, but what, and how do I fix it?
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