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SafeSign Single Sign On provides strong authentication for users who want to use a single identity and credential for simple streamlined access to web and Windows desktop applications
Drobo only lets you store the combined size of the two smaller drives (less about 5-10%). So if the 1TB drive does fail, the other two disks theoretically store the data until you replace the other disk. But you're right - keeping the disks similar size is the optimum way to do it.