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Interesting…
My SSD bootdrive (0) with 10.13 has - obviously - AFPS.
My external drive is partitioned in a SuperDuper clone drive (1) and a Time Machine drive (2).On 1 is still 10.12.
Now on (0) with 10.13 Disk Utility I can only convert drive (2) to APFS. With (1) the option is greyed out.
I also noticed that copying files with APFS is blindingly fast.. GB in a sec...
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