Your library of data grows every moment & now your storage solution expands in seconds too. Drobo holds up to four hard drives, can expand at any time, & supports up to 16TB on a single volume as disk sizes increase. Choose how big you want your Drobo today with any combination of drives capacities. Yes, you can mix & match drive sizes. Check out the Drobo Capacity Calculator to try it out for yourself. Protecting your data from a hard drive failure can be a challenging task. Not with Drobo. As long as Drobo has two hard drives, it protects you from a drive failure. If a drive happens to fail, you do not lose access to data, which means that you can keep on working. Just swap out the failed hard drive & replace it with a new SATA drive of any size. Please note: networking components such as switches, routers, UPS & wireless devices require that speeds & standards be consistent throughout the network to gain optimum performance. To avoid compatibility clashes or for advice, please contact us on solutions@ebuyer.com.