# Check SSD Health on Mac: SMART Status and Its Limits

> Read SSD status in Disk Utility and System Information, understand missing SMART readings, and know when to back up and use Apple Diagnostics.

Published: 2026-05-19 | Updated: 2026-10-31

Check a Mac SSD's health by reading the drive's reported status, not by measuring how much free space it has. Disk Utility can show a S.M.A.R.T. verdict for supported devices, but a missing reading is not a failure verdict and a successful check is not a prediction of remaining life. If files already fail to open or copy, preserve them before spending time on more tests.

## Back Up Before Investigating Errors

Apple's [disk failure guidance](https://support.apple.com/en-ie/guide/mac-help/mchlp2548/27/mac/27) says a fatal hardware error cannot be repaired by Disk Utility or another software repair tool. Back up as much data as possible, then arrange service. Do not erase the SSD to see whether the warning disappears.

Keep a [backup on another device](https://support.apple.com/en-us/104984) and check that important files open from it. A [synchronized folder alone is not an independent backup](https://support.apple.com/en-us/108922), since deletion can propagate to other devices. If copying fails, prioritize irreplaceable files and get help rather than running repeated benchmarks or repairs on the only copy.

## Read the Status in Disk Utility

Apple's [disk information guide](https://support.apple.com/en-ph/guide/disk-utility/dskutl1005/mac) lists S.M.A.R.T. status among the details a device can provide. Information varies with the selected item, so inspect the physical device rather than assuming a volume describes the whole SSD.

1. Open **Disk Utility**.
2. Choose **View › Show All Devices**.
3. Select the physical SSD above its containers and volumes in the sidebar.
4. Click the information button and look for its S.M.A.R.T. status.
5. Record the device name, status and date before comparing another reading.

Reading this information does not require erasing, partitioning or running First Aid. If the field is absent or unsupported, record that result and move to the next source of evidence.

## Compare With System Information

Open **System Information** by holding Option while opening the Apple menu, then choosing that app. Apple documents this route in the [System Information guide](https://support.apple.com/en-lamr/guide/system-information/welcome/mac). Inspect the storage hardware entry and any S.M.A.R.T. field it actually offers, keeping the device identity with your notes.

For SATA devices, [Intel's Mac instructions](https://www.intel.com/content/www/us/en/support/articles/000059196/memory-and-storage/ssd-management-tools.html) show the field under **SATA/SATA Express**, with **Verified** or **Failing** as possible readings. That example concerns Intel drives, so do not assume an Apple silicon internal SSD will show the same fields or a remaining-life percentage.

Apple's own disk information guide makes the available details conditional. On an Apple silicon Mac, use what the internal device exposes, and treat unavailable attributes as unknown. Do not infer NAND wear, a write-endurance limit or years remaining from an empty field.

## Interpret the Result Without Overreading It

| Reading | What you can conclude | Next action |
| --- | --- | --- |
| Verified or a passing health verdict | This check is not reporting failure | Keep backups and investigate any continuing symptoms |
| Failing or a fatal hardware warning | The device reports a condition needing attention | Back up first and arrange service |
| Unsupported or no field | This route did not provide a verdict | Try another supported reading method, not a repair by guesswork |
| First Aid completes successfully | The file-system check completed without an unresolved reported error | Do not turn that result into a hardware-life guarantee |

Apple says [Disk Utility cannot detect or repair every disk problem](https://support.apple.com/en-bh/guide/disk-utility/dskutl1040/mac). A passing status does not cancel repeated read errors, missing files or a hardware warning from another check. Keep the actual messages so support can distinguish them.

## Optional Third-Party Reading With smartctl

`smartctl` belongs to smartmontools, not macOS. Its [upstream manual](https://github.com/smartmontools/smartmontools/blob/main/src/smartctl.8.in) documents the `-a` information request and Mac device paths. If you already have it installed, use a read-only report rather than starting a self-test or changing device settings.

Intel's instructions use `diskutil list` to identify the target, then a report such as this:

```sh
diskutil list
smartctl -a /dev/disk0
```

`/dev/disk0` is an example, not a promise that every Mac assigns that identifier to its internal SSD. First match the physical device, name and capacity in the list, then substitute its identifier in the second command. Do not use an APFS volume identifier just because it appears beside the startup volume.

The report can only show what the device and access method support. An access error or an unsupported field is not proof of failure. If the report is incomplete, keep the error and tool version for support rather than installing drivers or disabling security to force a result.

## When to Use Apple Diagnostics

For continuing hardware symptoms, follow [Apple Diagnostics](https://support.apple.com/en-us/102550). Shut down and disconnect external devices except those Apple permits, such as power, keyboard, mouse, display and Ethernet.

- On Apple silicon, hold the power button until startup options appear, release it, then hold Command-D.
- On Intel, start the Mac while holding D. Apple gives Option-D as the alternative if D does not work.
- Follow the onscreen test choices and keep any reference code for service.

Apple says macOS Tahoe 26 and later can ask you to choose a specific diagnostic, whereas earlier versions run the process automatically. This is a hardware investigation, not a remaining-life calculator or a substitute for a backup.

For file-system repair steps, use [the First Aid guide](https://mole.fit/blog/how-to-use-disk-utility-first-aid-mac). For the separate question of rearranging disk data, see [whether Macs need defragmenting](https://mole.fit/blog/do-macs-need-defragmenting), rather than treating defragmentation as an SSD health test.

## Where Mole Fits

Mole Mac's **Status** uses the startup drive's reported SMART verdict as one input to its health assessment. An explicit failing verdict lowers that assessment, while an unsupported or unknown reading does not. This is not a detailed SSD wear report or a prediction of remaining life, so a quiet dashboard is not proof that a particular SSD was successfully checked.

## FAQ

### Does Verified Mean My SSD Cannot Fail?

No. It describes the reported check, not future reliability. Keep a separate backup and investigate continuing symptoms even when the current verdict passes.

### Why Is S.M.A.R.T. Missing on My Apple Silicon Mac?

Available information depends on the device and the method used to read it. A missing field means you lack that reading, not that the SSD passed or failed. Compare supported methods without assuming every internal SSD exposes the same attributes.

### Can First Aid or Mole Repair a Failing SSD?

Neither is a repair for a fatal hardware problem. Preserve the data and arrange service, following Apple's failure guidance rather than repeating cleanup or file-system repairs.

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