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M1 Mac users report alarming hard drive health readings – iMore (imore.com)
35 points by thedday 44 days ago | hide | past | favorite | 16 comments




FUD.

Everyone is spouting TBW when percentage used is what manufacturer set to be the warranties lifetime. Go read the smart specs.

No one talking about NAND types (SLC,MLC,TLC,QLC) or one of the hybrid types (pSLC, iTLC, etc) which can be difference between 1k and over 100k P/E cycles.

My guess is this behaviour is (mostly) by design, using high bandwidth mass storage as some awesome high performance virtual memory.

Why are people complaining about 1-3% wear in 2 months when used as a dev machines, or running a hundred tabs in chrome? That’s still over 5 years usage within expected lifetime on very heavily used machines, and it could be even higher in reality.


It actually swaps much more than the older machine that I have, at 3% wear already. And the indicator isn't linear. (at 30TB written currently, 250TB and the machine risks failure when estimating from a machine which actually failed from this already)

In those machines, Apple just uses TLC flash from Toshiba/Kioxia (off-the-shelf).

There's already some pathological cases where the drive actually died from this: https://twitter.com/lunixbochs/status/1366209143824998405?s=...

For some reason, it goes crazy after about a week and a half of uptime in desktop use, after which it starts thrashing the SSD at a crazy rate.

The 256GB model of the 980 Pro, a top-of-the-line TLC SSD is rated at just 150TBW.


Like others, you are comparing to some dated, off the shelf, consumer SSD (980 pro).

It is CLEARLY not regular consumer TLC given the figures reported. It will be using some pSLC type arrangement (iTLC?), otherwise percentage used would be considerably higher given TBW.

From the horses mouth: https://blog-us.kioxia.com/post/2020/09/18/solving-a-designe...

More information: https://www.electronicdesign.com/industrial-automation/artic....


True story: I bought a 256GB 960EVO ~4 years ago strictly for the performance, I've written 50TB, and it shows 100%. I think temperature might have something to do with the percentage. I replaced it with a 1TB Hynix P31 for the same price (~$100) recently. 1TB MLC/TLC drives were ~$400+ when I bought the 960EVO, so I'm not mad. If I couldn't replace it, I just might be. The TLC has improved this much between the two drives: 1200MB/s vs 1700MB/s sustained write, 1.5x random read IOPS, almost 2x TBW rating compared to 1TB 960EVO.

The 960EVO hasn't started to slow down yet or use it's reserved space, so I imagine I can keep using it as an external drive until it does.

edit: What I've said is indicative of an TLC/PCIE 3 NVMe upgrade path, what will a PCIE 4 NVMe (980PRO) upgrade look like in 4 years?


The SSD in these macs are soldered. So its not like you can just swap out the drive like other solid state drives.

I think thats also part of the problem. You have a device that wears out, but basically is unserviceable.


I think think your last sentence answers your own question. People are worried their new machine might only last 5 years.


Its not a case of "lasting", its a case of warranty. That is SPECIFICALLY what "percentage used" is for! What SSD can you buy that has a warranty longer than 5 years? Do your other devices stop working when out of warranty? Why do people think these will?


1 percentages, signal strength bars, its all lies https://mspoweruser.com/apple-admits-to-the-iphone-lying-for...

2 real SSD warranties are actually specified in TBW.


1) This isnt a signal bar, its a smart report.

2) This field is specifically for warranties - go read the spec. All manufacturers use this in their warranty - its actually coded into the controller. They may report the value to you in TBW, but that same value is stored in the controller, which is where the percentage comes from. If you think otherwise, why dont you point me at the apple warranty that states the number of TBW.

Again, go read the spec instead of spreading FUD.


As a counterpoint, I've had a 16GB M1 MacBook Air since launch for casual use and light experimental home dev work. 0% wear so far.


Not far from you at 1% wear with similar use.


Defo waiting for 32GB Ram. 8GB always looked unnatural!


> any mac experts know why my SSD just fills up throughout the day, frequently going from 65%ish percent free to 100% over the course of 8 hours?

My phone does that, I’m not surprised the desktop version does it too...


If Apple put more memory in these machines there would less thrashing.


We are witnessing repeat of Tesla infotainment NAND wear fiasco by Apple.




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