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Solid State Disk, a generic term for computer storage devices that have no moving parts and do not involve a "hard disk". A hard disk, in contrast, is a device incorporating a spinning platter or platters that store information magnetically.
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APFS filesystem performance is very poor
(a) Internal SSD formatted as APFS. (And the performance is worse if the file already exists!) … time $HOME/bdj4/src/tt & time $HOME/bdj4/src/tt &
real 0m10.238s
user 0m0.136s
sys 0m11.497s
real 0m10.239s
user 0m0.203s
sys 0m17.234s
(d) Just for comparison, on Linux, on an SSD …