You may get a "Disk full" message even if plenty of space is
left.
This is caused by adding too many small files to a USB drive.
USB drives are formatted using the FAT file system, and their
root directory has a fixed number of directory entries.
If you fill up the root directory you can't add any more files.
This can happen if the small files have long names. Every file
has to have a directory entry, and those with long filenames
take more than one entry.
To solve this problem,
Move a few files out of the root directory, so the root
directory is no longer full. Create a subdirectory and give it
any name you like. Now copy all the rest of your files into the
subdirectory. Unlike the root directory, a subdirectory will
expand as needed, so you won't get a "Disk full" error until the
USB drive is really, truly full.
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