Support Center

How do I manually rebuild degraded RAID 1 Array from Apple Disk Utility?

How do I manually rebuild degraded RAID 1 Array from Apple Disk Utility?

The following steps shows you how to use Apple’s Disk Utility to rebuild CalDigit T3 or T4 RAID 1 (mirror RAID) if one drive fails and causes the RAID 1 array degraded.

1. Launch Disk Utility, go to the degraded RAID array, and select the drive that is missing from the RAID 1 array.

2. Click the “Minus” button.

Select Missing RAID 1 disk in Apple Disk Utility

3. Click on the “Demote” button to demote the missing RAID disk from the array.

Arrow pointing to demote button in Apple Disk Utility with Missing RAID 1 disk selected

4. Click on “Demote” button from the popup window.

Demote confirmation window. Arrow pointing to Demote button

5. Physically remove the bad RAID disk from CalDigit T3 or T4 chassis. 6. Insert the new drive module that you obtained from CalDigit to T3 or T4 drive slot.

7. In Disk Utility, you will see a brand new disk in the list, drag and add it to the degraded RAID array. 8. Click on “Rebuild” button to trigger the RAID rebuilding. It may take several hours to rebuild the entire RAID array depends on the drive capacity.

Arrow pointing to newly listed disk member after being dragged to degraded RAID array set. Arrow pointing to rebuild button in Apple Disk Utility.
Rebuild progress window in Apple Disk Utility.

CalDigit Support is ready to assist you.
For an optimal experience please have your product name, serial number, and operating system on hand prior to contacting support

Have a quick question?
Stop by and give us a tweet @CalDigitSupport

Follow us on

Social Media

Follow us on

Social Media

Need some help?

Hours of Operation

Mon – Fri   9:00AM – 6:00PM

(PST, UTC/GMT –8)

Mon – Fri 8:30AM – 5:30PM  

(UTC/GMT 0)

Mon – Fri 9:00AM – 6:00PM

(UTC/GMT +9)

Mon – Fri 8:00AM – 5:00PM

(UTC/GMT +8)

CalDigit Support is ready to assist you.

For an optimal experience please have the following on hand prior to contacting support. 

Ready to chat?

Click the button to get started!

Need some help?

Send us an email! Our customer service representatives are patiently waiting!

+1 (714) 572 9889

 

Support@CalDigit.com

Mon – Fri   9:00AM – 6:00PM
(PST, UTC/GMT –8)

Due to the ongoing COVID-19 epidemic and California’s statewide “Stay at home” order, CalDigit’s Sales and Support teams are working from home to ensure the safety of our employees. We do not expect any slowdown in responding to customers but please contact us via email and online chat rather than phone calls during this time for a faster response to your enquiries. Orders placed directly from CalDigit online stores can still be processed immediately.

+44 (0) 1993 700 972

EUSupport@CalDigit.com

Mon – Fri 8:30AM – 5:30PM  
(UTC/GMT 0)

+81 (50) 3136 5168

Japan@CalDigit.com

Mon – Fri 9:00AM – 6:00PM
(UTC/GMT +9)

+886 (2) 2226 0966

Asia@CalDigit.com

Mon – Fri 8:00AM – 5:00PM
(UTC/GMT +8)

For an optimal experience please have your product name, serial number, and operating system on hand prior to contacting support.

Cookie Graphic

This website uses cookies to improve your user experience. By continuing to browse this website, you are agreeing to our use of cookies. We encourage you to review our Privacy Policy.