My IMAC recognises an external drive but won't let me save to it.  Message is the there is no space available but there is 500G left.

My IMAC recognise an external drive but won't let me save video or files to it.  Error message is that there is not enough space but the drive is 500G.
Only just started happening a week ago.  Same with USB drives.
Regards,
Robert

How much is "plenty of storage"? Go to Settings>General>About>Available
The GB size of the download file is the compressed size (like .zip or .dmg). When the file is installed/uncompressed it can be 2-3 times larger.
 Cheers, Tom

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