My disks are ejected while in use. What can I do?

If all the disks in your enclosure are ejected simultaneously while in use, this is typically caused by a momentary Thunderbolt bus disconnection, not actual drive failures.

Why This Happens with Thunderbolt

Thunderbolt is a “hot-swap” bus, meaning you can connect and disconnect devices without powering off your computer. However, when a Thunderbolt device loses contact with the Thunderbolt bus—even momentarily—the enclosure’s drives are instantly powered off as a safety measure.

What causes momentary disconnections:

• Loose cable connections
• Signal interference or electrical noise
• Cable movement or vibration
• Power supply fluctuations
• Bus contention when multiple Thunderbolt devices are connected

When this happens, all drives in the enclosure disappear from macOS simultaneously, and SoftRAID alerts you that the disks have been ejected.

How SoftRAID Detects This

SoftRAID is designed to detect and inform you when any of your disks become unavailable. Whenever SoftRAID registers that disks have been ejected—for whatever reason—it displays a warning automatically. This alert helps you take action before data loss occurs.

Solutions to Prevent Disk Ejections

Try these troubleshooting steps in order:

1. Disable Drive Sleep
• macOS Sequoia (15.x) and Tahoe (26.x):
• Go to System Settings → Energy
• Uncheck ”Put hard disks to sleep when possible”
• Go to System Settings → Lock Screen
• Set display sleep to ”Never” (when plugged in)
• Go to System Settings → Displays → Advanced
• Check ”Prevent automatic sleeping on power adapter when display is off”

See our FAQ: Why do my drives keep going to sleep? for detailed instructions.

2. Check and Secure Cable Connections
• Power off your enclosure
• Disconnect and reconnect all Thunderbolt cables
• Ensure cables are fully inserted and connections are tight
• Clean ports with compressed air or 90% isopropyl alcohol if dusty
• Power on the enclosure and test

OWC ClingOn adapters can help maintain secure Thunderbolt connections by adhering to your enclosure.

3. Try Different Thunderbolt Ports

Apple Silicon Macs: Each Thunderbolt port is an independent bus

• Try connecting to different ports on your Mac
• Test each port individually to see if the problem is port-specific

Mac Mini users:

• Move the Thunderbolt cable as far as possible from the power cable
• Power cables can cause electrical interference with Thunderbolt signals

4. Rearrange Daisy Chain Configuration
If you’re daisy-chaining multiple Thunderbolt devices:
• Try connecting the storage enclosure first in the chain (directly to Mac)
• Connect other Thunderbolt devices after the storage
• Test different daisy chain orders
• Consider reducing the number of devices in the chain

5. Bypass Thunderbolt Docks

If using a Thunderbolt dock:

• Connect the enclosure directly to your Mac (bypass the dock)
• Test for several days
• If the problem disappears, the dock may be causing signal issues
• Consider using the dock only for non-storage peripherals

6. Replace Thunderbolt Cables
• Try a different Thunderbolt cable (use a known-good cable)
• Some cables are more susceptible to signal degradation
• Shorter cables (0.5m – 1m) are generally more reliable than longer cables

Historical Context

This Thunderbolt disk ejection issue has affected users for over ten years across multiple macOS versions. However, recent Mac models (especially Apple Silicon Macs from 2021 onward) have greatly reduced the prevalence of this problem due to improved Thunderbolt controllers and better power management.

If you’re experiencing frequent ejections:

• Older Intel Macs (2015-2019) are more susceptible
• Newer Apple Silicon Macs have significantly better Thunderbolt stability
• The issue is more common when multiple high-power devices are connected

Important Notes

This is not a SoftRAID issue:

• SoftRAID only detects and reports the ejection
• The actual cause is Thunderbolt bus behavior or hardware issues
• This affects all Thunderbolt storage, not just SoftRAID volumes

USB vs. Thunderbolt:

• USB does not have this instant power-off behavior
• USB ejections are almost always due to faulty cables or enclosure failures

Frequency:

• Approximately 1 in 100 users experience this issue
• Frequency ranges from once every few hours to once a year
• Environmental factors (electrical interference, cable quality) play a significant role

If Problems Persist

If you’ve tried all the above steps and still experience disk ejections:

• Contact SoftRAID support
• Include a SoftRAID Tech Support Report
• Note which troubleshooting steps you’ve already tried
• Describe the frequency and timing of ejections (during sleep, during use, randomly)