All Drobo products use any 3.5” SATA hard drive, from any manufacturer, of any capacity, and any rotation speed (5400 RPM, 7200 RPM, etc.). You can "mix and match" hard drives in your Drobo storage device and it will take full advantage of the capacity on the hard drives you add to the system.
Drobo products have been successfully tested with the most popular hard drives on the market. However, in the event that we should discover any particular issue with a specific brand of drive, these will be listed on the support website.
Tip: To help you determine what hard drive size you need to add in order to reach a specific total storage capacity, use Capacity Calculator, an online utility that lets you drag and drop hard drives into a virtual Drobo storage device to determine your protected capacity with a specific mix of drives. This is a valuable tool to find out what will happen when you add or replace a hard drive.
Warning: Drobo storage devices cannot use SSD, IDE, PATA or SCSI hard drives.