Lapp, #8026:
Wrong attribution - it might help if you could actually verify who said what before posting :-).
My original post was in reply to James890 as follows, #7968:
James890:
Data remanence on CVR?
If they were still using magnetic tape, then there may be a chance to recover earlier recordings, much as overwritten hard drive data can sometimes be recovered if you have a right tools.
However, I would expect that modern cvr systems would record to flash or battery backed up memory. ie: digital rather than analog recording. Earlier contents would be overwritten in a continuous loop from the start of memory once end of memory is reached. There would be no way to recover data that has been overwritten...
To which CommanderCYYZ said in #7987 :
@syseng68k
It's actually much easier to recover data from over-written digital media. FBI software can recover data from digital media that has been over-written multiple times, or reformatted repeatedly.
Clearer now ?…