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iPhone owners say the latest iOS update is resurfacing deleted nudes (www.theverge.com)

submitted 6 months ago by misk@sopuli.xyz to c/technology@lemmy.world

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cross-posted from: https://sopuli.xyz/post/12670977

iPhone owners say the latest iOS update is resurfacing deleted nudes

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[–] cm0002@lemmy.world 72 points 6 months ago* (last edited 6 months ago) (16 children)

Computer data is never actually “deleted” until it’s overwritten with new 1s and 0s — operating systems simply cut off references to it.

That's not entirely correct, and I would expect a tech news site to know but ig not.

It's true with spinny's since they store data magnetically on the platter with 1s and 0s, but SSDs store data on the NAND as a held charge. If there's a charge in the block it's a 1 if there's no charge it's a 0.

With spinny's, when a file gets marked as "deleted" the residual magnetic 1s and 0s will remain on the platter until eventually overwritten like they say

But with SSDs, when a file gets marked "deleted" then within no more than a few minutes TRIM comes along and ensures the charge on the NAND is released (Which means that data is gone, permanently) for that data, there's no residuals to worry about like with spinny's and is in fact necessary to ensure decent lifespans.

ETA: Link to a study from last year on this

[–] Traister101@lemmy.today 11 points 6 months ago (1 children)

There's most certainly residuals, I've accidentally deleted then installed Windows on top of a bunch of my game saves. I found some random file recovery application and let it run for awhile. Guess what? Nearly everything was readable despite the fact it got wiped and then had a whole windows install.

NAND also experiences minor permanent damage on writes. Actually clearing the NAND involves a write as the charge has to be forced out (a write of 0s)

[–] cm0002@lemmy.world 13 points 6 months ago* (last edited 6 months ago)

This can happen when TRIM is disabled

Here's a study published last year I read that goes through this exact thing

In consideration of results obtained from the experiments, it concluded that the behavior of Wear Leveling in different SSD manufacturers having the same storage capacities does not match. It varies based on the number of files, types of files, and sizes. The recovery of files from different SSD manufacturers showed different results. In all SSDs, not a single trace of any file found in disk format scenario(s). Whereas, some of the data recovered in the delete case and from only one drive. It clearly showed different behavior of data recoveries in format and delete cases. The obvious finding from this study is that the time interval of image acquisitions played a significant role, and the longer time interval supports few chances of data recovery because the TRIM and Garbage Collection process effects clearing residual data from the drives

Non PDF link

Edit: corrected links

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