What feature allows me to add drives in RAID

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May 7, 2015
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Hi.

I'm shopping for a 4-bay NAS Enclosure, and plan to add 3 drives in RAID-5. What feature/s would the enclosure need to allow me to add a 4th drive later, that would be added to the RAID configuration without losing all my Data ?
 
If you aren't sure and want to expand you might want to look into one of these.

http://www.drobo.com/

GF's Dad has two. Very nice. Just add in another drive later on and it just expands it for you.

Otherwise you will most likely need a Good RAID Card in your PC that allows you to expand a RAID 5 and they aren't too cheap.