Comment by rlpb

Why must SSDs have "power loss protection" in the form of a battery or supercapacitors to finish writes? Can they not simply cache writes but not falsely claim to the OS that they aren't fully written yet, and do some internal housekeeping (journal-like) for recovery? Does SATA/SCSI support the concept of "sync", or would allowing the disk to fall behind without deceiving the OS kill performance in some way?