also, just putting a reasonable selection of apps onto a 16Gb tablet will almost fill it, thus overwriting almost all the available storage, so there is little scope for retrieving old data. less true, obviously for a 32Gb tablet.
i found I was forever juggling apps, wiping caches etc to live within 16 Gb and that was with streaming, not storing all video and music
its not like selling a used PC with a Terabyte or more of hard drive space for someone to poke around in.
from memory, an amazon factory reset takes minutes , not hours, for 16Gb. NB about a third of that is being used for the Fire OS which does not get re-written
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