Secure Erase rMBP before exchange?


exchanging rmbp, rebooted recovery , ran disk utility.
erase button available security button greyed out.

standard erase needed wipe data on ssd?
 

if they've implemented correctly, should be. on ssd there function quick wipe of whole drive tells controller mark whole drive available again ( , on controllers @ least throw away internal encryption key date stored on drive non recoverable direct hardware access, don't know if applies apple use in rmpb or not ), , reads return 0's until written sector.
 


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