Remove the failed disk and put in a new formatted disk.

It will say ‘Pass Through’

Click on the drive and change from ‘Pass Thru’ to ‘Unconfigured’

Screen Shot 2015-12-28 at 2.17.11 PM


Screen Shot 2015-12-28 at 2.17.33 PM


Now click on ‘Rebuild’ and it will rebuild the failed disk from the other disks.

Screen Shot 2015-12-28 at 2.17.49 PM


wait for it to finish – 3-6 hours!

Screen Shot 2015-12-19 at 6.32.31 PM

7 Comments on How to rebuild a failed Disc in a Pegasus promise Raid array

  1. tariq elmeri says:

    Hey man, thanks for this. I’m kinds stuck in another situation! more than 1 disk failure. I was in the middle of changing desktop setup, and cleaning up the dust. I opened one of the hard drive bays by mistake (STUPID) and saw a lot of dust. and I was putting them back they turn red. and cleaned more, so 5 out of the 6 drives turned red. And when I opened the Pegasus utility it shows that 5 out of the 6 drives Status is dead. and all show the right capacity as 2 TB except for one that shows 0 bytes.

    This is obviously making me nervous, as everything I have and have been working on, including clients work is there. with no other backup. And I’m wondering if there’s a solution to retrieve or fix this.

    I appreciate an urgent response,

    Thank you,

  2. danel says:

    Thanks! this helped me a lot!

  3. bob says:

    You rock Wayne!

  4. DYB says:

    Thanks for this simple tutorial! The Pegasus manual and other instructions online require a rocket science degree. Only difference is my rebuild is taking much longer; it’ll probably be about 24 hrs to rebuild one 4TB drive.

  5. Paul Burgess says:

    I am nit able to rebuild as it states ‘Incomplete/Missing PD’
    Any ideas what to do?

  6. David says:

    Why would ‘Start’ under Rebuild be greyed out? I have set the drive to Unconfigured. I am upgrading my Pegasus R8 from 3TB drives to 6TB drives. Thanks in advance.

  7. christian says:

    Thanks Wayne

    If Pegasus Manual could be that clear and simple!
    I know technology, but frankly , after reading the manual almost from cover to cover, I couldn’t even get to activate the greyed Rebuild button… frustrating.
    Now rebuilding a failed 3TB drive in a pegasus R4 RAID5 thanks to you.
    Smile coming back.

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