Although this was a little disappointing, especially as the Promise-recommended drive I found on Amazon was more expensive per terabyte than the 5tb and 6tb drives I found, I decided to play safe and avoid the huge hassle of a RAID problem in the middle of a big edit. Next, I sought the advice of colleagues on Creative Cow – the verdict was unanimous: Promise will have tested many drives so it really is best to use only the ones they recommend. ideally all drives should be replaced at the same time (of course, you must back up the content elsewhere first, then add it back to the new array you will create).
You do not have to install the identical make and model of physical drive, but they must of course be the same type (HDD or SSD), same interface – SATA 3 Gb/s or 6 Gb/s, and same spin speed : 7,200 RPM or 15,000 RPM. All drives should be the same capacity if you put a 4tb drive in a RAID where the other drives are 2tb, that 4tb drive will only show up as 2tb. The agent also confirmed another important couple of points when upgrading all of the drives in a Pegasus Promise RAID: Promise had a Live Chat facility, and an agent responded immediately – but could not confirm if any drives larger than 4tb could work successfully with my Pegasus R4, as none had been tested. To be safe, I consulted the Promise website and found their list of recommended drives – they test for compatibility and only suggest the ones that go through that process.īut there weren’t any drives bigger than 4tb, and no mention of Western Digital. So, for the upgrade, my first thought was – how can I maximize a Pegasus R4 that came with 4x 1tb drives? I’ve recently purchased Western Digital WD 6TB Drives for the Drobos we use as local USB backups, without problems, so thought these would be a good bet. I use my Pegasus R4 configured as RAID 5 for video editing – if one drive fails, the others have all the data and I can hot-swap that drive and move on relatively quickly. 
Or you might have already upgraded, and now individual drives are failing and needing replacement – if so, read on… If, like me, you bought a Promise Pegasus R4 RAID with 4x 1tb or 2tb drives as soon as Thunderbolt was released and the Pegasus was available, you’ll probably have considered upgrading the unit with larger capacity hard drives, now that bigger drives are readily available.
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