Assuming a given SSD supports TRIM, and is on a physical bus that supports sending that command, and the connected computer is running an OS that is aware of TRIM:
If the drive is formatted, or has had its files erased, will the data be unrecoverable after the drive's firmware has performed its full garbage collection cycle? For example, 24 hours after the fact?
I know that TRIM was initially introduced to flag blocks for later erasure to speed up writes to the underlying flash memory. However, I'm wondering if this erasure means that the data is actually unreadable, even when a user is able to put the drive in factory access mode, or has access to the physical flash chips. I've read that the data is zeroed-out (DZAT) or some other deterministic value (DRAT) when accessed sector-by-sector through the typical SAS/SATA interface, for example when using the
dd command in Linux, but that only covers blocks mapped by the FTL and of course does not necessarily mean the physical memory is erased.
Are fully TRIMmed blocks truly, completely erased, or only presented as such to the OS?