I'm sure manufacturers are doing that but I don't know how we, as consumers, would get real numbers.

We would need to be able to track actual failed SSDs against the estimated TBWs.

Of course, the expected life is only an estimation. Activity Monitor -> Disk -> order by Bytes Read will show what's doing the most writing to disk. He has used as much of his SSD lifetime in five months as I have in nearly 4 years.Īll I can suggest is he carefully check what's doing the writes. However, Robert Follis is showing a real issue My M1 MBP 8/256 has used 21% of SSD life in 5 months writing 258TB !! to disk. If yours is also 1000TBW, you would expect about 250months life based on 12.3TB in three months Percentage Used: 21% It shows that my SSD TBW is estimated at 1000TB. My own 3.75 year old 15' MBP is showing Percentage Used: 21%, so I can expect another 14 years from it. Your Mac was 3 months old when you posted this, so you can expect 150-300 months life out of it. You have about 1% used, but since it's rounded it could be anywhere from 1-2%, so you have between 98-99% of your SSD life left. The part of smartctl relevant to SSD life is the Percentage Used. Is Big Sur going berserk with writes? Is anything correct? Is the total calculation incorrect? Is the sector size/unit size even correct? The math says the total number of writes should be ~120 GB, which isĪwfully close to a difference factor of 1000. The M1 SSD sector size is 4096 (if that is even being reported correctly. Just looking at your data, units/sectors written being reported is 24 MB. Knows how many writes (or reads) there really are being done. SMART status available and formats of the data and how they should beĢ) While Activity Monitor has been around a long time, I believe thereģ) Until there are reliable tools to measure the usage, no one really Written times sector size do not add up to total bytes written.ġ) The SSDs in the M1 machines are not totally documented in terms of That make sense to give the totals they are getting, i.e. One said about 30 GB was written another said only about 10 GB was writtenĪlso, some of the SMART tools themselves do not have numbers Showed nearly 70 GB of writes, but only 500 MB swap was used so it is notĪ RAM swapping issue and based on Activity Monitor, the apps that were used neverĭid more than a couple GB of writes. Said there were 40 GB of writes and smartctl actually reported thatĪnother example today, I did a photo processing session and Activity Monitor As a matter of fact, one day, Activity Monitor To what Activity Monitor is saying for the number of bytes, it doesn't jive SMART tools all of which gave different usage data.

I have been investigating this 'issue' as well. SMART overall-health self-assessment test result: PASSEDįor one, reads don't matter with SSDs, only writes. St Op Max Active Idle RL RT WL WT Ent_Lat Ex_Lat Optional Admin Commands (0x0004): Frmw_DL Smartctl 7.2 r5155 (local build)Ĭopyright (C) 2002-20, Bruce Allen, Christian Franke, = START OF INFORMATION SECTION = 2) What is this SSDs actual lifetime writing ability? 3) When is my SSD actually expected to fail 4) What is Apple's position on this and what action are they taking to address it? My questions are 1) is smartctl correctly reporting SSD data write usage. Assuming this SSD has a lifetime ability to write 150TB, this disk is expected to have issues in approximately 2.8 years. The the smartctl tool reports that my M1 MacBook Air has written 12.3 TB since being purchased in mid-December. In the past few weeks it's been reported that M1 SSDs are writing a sufficient amount of data to their drives such that it could render the drive at its end of life in a few years.

M1 mac check ssd health