| Write endurance I guess would be one. Samsung 980 Pro is under warranty up to 600 TBW. I don't know if that is external data written, or also includes whatever overhead the drive's internal processes have, which I imagine is higher when you run it near max capacity. RAM has virtually unlimited write endurance. I was interested for CCTV recording, as it can be murder on standard HDDs and consumer SSDs. Continuous writing at whatever the total bitrate of all cameras is, plus whatever index you're using, plus whatever clips its generating. Ideally HDD for the constant, SSD for the clips and index. I had a small (120GB) clip and index SSD drive start to struggle in a dirt-cheap non-critical system and found it had written 42TB in a year. Now part of that was poor configuration, but the drive was REALLY starting to struggle, throughput would occasionally drop off a cliff. The system was battery backed, so a RAM disk would have been fine, and on triggering the UPS I'd have it just copy the contents to a fast HDD. |