Why does macOS keep ejecting your external SSD?
Short answer: The "Disk Not Ejected Properly" notification means macOS lost the USB connection to the drive — even though the cable is still plugged in. The three most common causes are: a marginal USB-C cable losing signal under vibration or heat, macOS putting the USB port to sleep to save power, and APFS (Apple's filesystem) errors on the drive that trigger a protective force-eject. Fix in this order: cable, power settings, filesystem check.
How to fix the external SSD disconnection on macOS Sequoia
Step 1: Test with a different cable
This resolves the problem in a majority of cases. Use a cable rated for USB 3.2 Gen 2 (10Gbps) or better — not a generic USB-C charger cable. The packaging or product listing should explicitly state data transfer speed. Connect the SSD directly to the MacBook port — avoid USB hubs for this test, especially passive (unpowered) hubs. If the SSD stops disconnecting with the new cable, the old cable was the fault. Also test all USB-C ports on the Mac — one port being damaged or corroded can cause intermittent disconnects on that specific port only.
Step 2: Disable macOS USB port sleep
Open System Settings → Battery (or Energy Saver on older macOS). Find Put hard disks to sleep when possible and disable it. On MacBook laptops, this setting also controls USB peripheral power — when the Mac suspends USB power to save battery, connected SSDs may not wake cleanly, triggering the eject error. Also check Prevent automatic sleeping when display is off — relevant if the SSD disconnects when the screen sleeps. After changing these settings, keep the SSD connected overnight to verify the disconnects have stopped.
Step 3: Run First Aid on the external SSD
Open Disk Utility (Spotlight: Cmd+Space → type Disk Utility). Select the external SSD in the left panel. Click First Aid → Run. Disk Utility will scan the APFS or exFAT filesystem for errors. If First Aid passes clean, the problem is not the drive's filesystem. If First Aid reports unrepairable errors, back up all data immediately using a different Mac or by connecting the drive to a Windows PC. After backup, reformat the drive in Disk Utility (Erase → APFS or exFAT). An APFS volume with journal errors will trigger repeated forced ejections — reformatting is the only reliable fix.
Step 4: The India angle — humidity and USB-C port oxidation
India's monsoon season brings high ambient humidity. USB-C port oxidation from moisture is one of the most common causes of intermittent USB-C connectivity issues on MacBooks in India — and it is easily mistaken for an SSD or cable problem. Signs of port oxidation: the issue appears or worsens during June–September, only affects one specific port, and a can of compressed air followed by a dry cloth through the port temporarily improves it. Never use water or alcohol directly in the port — see our doorstep laptop repair service for a proper port cleaning. Also see our guide on resetting MacBook M-series for deeper recovery steps if the port issues persist after cleaning. For data safety during diagnosis, our data recovery service handles APFS and exFAT drives that have become unreadable.
When to call a laptop repair service
When DIY ends
Seek professional help if: the SSD is not recognised at all (not just ejecting), all USB-C ports show the same issue with multiple cables and devices, or the MacBook shows any physical damage to the USB-C port area.
Typical cost in India
USB-C port cleaning / inspection: ₹500–₹800. USB-C port replacement (MacBook): ₹3,000–₹8,000 depending on model. Data recovery from a force-ejected corrupted SSD: ₹3,000–₹12,000. Doorstep visit charge: ₹149, No Fix No Fee.
A note from the LRW Engineer Team
When an external SSD randomly ejects, the immediate risk is file corruption — especially if it is an active Time Machine backup drive or a video editing project drive. Immediately copy critical files off the drive to another location before troubleshooting. A clean copy is far less stressful to work from than trying to recover a partially-written file after corruption.