Skip navigation

Can I swap out Pegasus RAID HDs?

1196 Views 5 Replies Latest reply: Feb 4, 2014 9:42 AM by SupportGuyJoe RSS
elagnitrop Calculating status...
Currently Being Moderated
Jun 24, 2012 11:11 AM

I'm looking at buying a thunderbolt RAID system and my eye is trained on the Pegasus 4TB RAID system. My plan is two buy it and take out 3 of 4 of the HDs and replace them with my 3 Hitachi 7200rpm 2TB HDs which would give me more capacity. Can I do this? I'm new to RAID and just want to be certain I can swap out the HDs before buying it.

MacBook Pro, Mac OS X (10.5.8)
  • Strontium90 Level 4 Level 4 (2,895 points)
    Currently Being Moderated
    Jun 26, 2012 6:18 PM (in response to elagnitrop)

    You can do whatever you want.  However, (and this is from experience) you will not get any support from Promise once you replace their drives. 

  • Picar Calculating status...
    Currently Being Moderated
    Jan 17, 2013 7:46 AM (in response to elagnitrop)

    Will be a miracle if it works with ther certified drives, I cannot imagine what you can see with other drives....



    good luck!


    No support if you change their original drives but you can put back them in case of a unit failure.


    R4 shoud support any up to 4tb hdd.


    My R4 arrived DOA just to tell you how is serious this company....they assemble and ship, the final test will be at your home with your waste of time for tests and waiting new units .


    I will never buy again from Promise specially at this top prices where you can expect at least a basic quality.

  • Jerryrigged Calculating status...
    Currently Being Moderated
    Feb 23, 2013 10:59 PM (in response to elagnitrop)

    At the Promise website, there is a Pegasus hard-drive compatibility list that shows drives they've tested and certified as compatible with the system. The drives theyve certified include a newer Seagate 3TB drive that is fairly reasonably priced. My short experience (3 weeks) with the re-furbished Pegasus I bought at Newegg has been very positive! FAST and so far, reliable.

  • freejazz_man Level 1 Level 1 (0 points)
    Currently Being Moderated
    Mar 7, 2013 10:20 AM (in response to elagnitrop)

    I'd be careful about mixing up different brand drives


    I would only use the drives promise says it supports, which are very few.

  • SupportGuyJoe Calculating status...
    Currently Being Moderated
    Feb 4, 2014 9:42 AM (in response to elagnitrop)

    You'd need to replace all the drives in the RAID with larger ones before you can create a larger array. Make sure you've checked for all the updates inside Promise Utility so that you can use our latest compatibility list in the Download Center at If you have any more questions, we'd like to discuss them with you over the telephone. Please call us at 408-228-1500.


    Joe Engledow

    Technical Support

    Promise Technology


More Like This

  • Retrieving data ...

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.