I heard that hard drive cache can mess with the shred command making it not useful on modern hard drives, but I can't find any other evidence to back up that claim.
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It is a safeish on a modern spinning hard drive, but its not a good solution for an SSD as they remap stuff behind the scenes. FDE is a better solution where practical.
Caches will disappear when the power goes out unless its a hybrid drive (hybrid drives dont seem common anymore - and the hybrid part suffers from the ssd issues).
It's still possible - eg if a hard drive is failing - for data to be hidden because of remapped bad sectors, but this would be massively less common/exploitable then on SSD, and you can mitigate by checking SMART reallocated sector count.
davidgo
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