https://github.com/pforret/m1_ssd_tbw

Measure SSD wear (Total Bytes Written) on MacOS M1 (ARM64) machines
https://github.com/pforret/m1_ssd_tbw

apple arm arm64 m1 macos ssd

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Measure SSD wear (Total Bytes Written) on MacOS M1 (ARM64) machines

• Host: GitHub
• URL: https://github.com/pforret/m1_ssd_tbw
• Owner: pforret
• License: mit
• Created: 2021-02-21T09:37:18.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2021-02-22T21:13:47.000Z (over 4 years ago)
• Last Synced: 2025-04-04T12:52:45.610Z (7 months ago)
• Topics: apple, arm, arm64, m1, macos, ssd
• Language: Shell
• Homepage:
• Size: 706 KB
• Stars: 4
• Watchers: 2
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE
  • Code of conduct: CODE_OF_CONDUCT.md

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# m1_ssd_tbw

![](assets/m1ssd.jpg) 

Measure SSD wear (TBW) on MacOS M1 (ARM64) machines

## Background

* [M1 Mac owners are experiencing extremely high SSD writes (Feb 17, 2021)](https://linustechtips.com/topic/1306757-m1-mac-owners-are-experiencing-extremely-high-ssd-writes-over-short-periods-of-time-likely-thanks-to-aggressive-swap/)

        The most severe cases have "consumed" about 10-13% of the maximum warrantable TBW value of the SSDs

  

* [@marcan42 (Feb 16, 2021)](https://twitter.com/marcan42/status/1361722552238841860)

        Update on M1 SSD wear issue: 

        Available data suggests that write endurance ratings are not proportional to drive size.

        256GB model: ~2000TB [1700-2300]

        2TB model: ~5000TB [4300-6000]

* [SSD Lifespan: How Long do SSDs Really Last? (July 30, 2020)](https://www.ontrack.com/en-us/blog/how-long-do-ssds-really-last)

        

        A typical TBW figure for a 250 GB SSD lies between 60 and 150 terabytes written

## 🔥 Usage

```

Program: m1_ssd_tbw 1.0.0 by peter@forret.com

Updated: Feb 22 22:00:20 2021

Description: Measure SSD wear (TBW) on MacOS M1 (ARM64) machines

Usage: m1_ssd_tbw [-h] [-q] [-v] [-f] [-l ] [-t ] [-d ] 

Flags, options and parameters:

    -h|--help        : [flag] show usage [default: off]

    -q|--quiet       : [flag] no output [default: off]

    -v|--verbose     : [flag] output more [default: off]

    -f|--force       : [flag] do not ask for confirmation (always yes) [default: off]

    -l|--log_dir > : [option] folder for log files   [default: /Users/pforret/log/m1_ssd_tbw]

    -t|--tmp_dir > : [option] folder for temp files  [default: .tmp]

    -d|--disk >    : [option] disk ID  [default: /dev/disk0]

             : [parameter] action to perform: info/check

```

Running it (needs sudo password because of smartctl:

```bash

> ./m1_ssd_tbw info   

Password:

SSD disk size: 494 GB

SSD disk used: 146 GB

SSD bytes written: 50 TB

SSD current index: 101 x

SSD max index: 5800 x

SSD wear = 1.74 %

```

## 🚀 Installation

with [basher](https://github.com/basherpm/basher)

	$ basher install pforret/m1_ssd_tbw

or with `git`

	$ git clone https://github.com/pforret/m1_ssd_tbw.git

	$ cd m1_ssd_tbw

## 📝 Acknowledgements

* script created with [bashew](https://github.com/pforret/bashew)

© 2021 Peter Forret