This depends on your controller.  The H710 does NOT support JBOD/non-RAID/pass-through, but the H310 does.  The H310 does NOT have write-caching, so if you eventually need to set up a high-performance RAID array with using write-cache, you will need to replace the H310 with the H710.  You can use disks individually/separately on the H710, but each disk must be configured as a single-disk RAID 0.
I'm looking at configuring an R720 server for my company and I'd like to run windows server 2012 R2 and use storage spaces.  From what I've read, Dell talks about using a separate Powervault MD1220 for the JBOD's needed.  I'd like to just put a bunch of hard drives in  the R720 and configure them for storage spaces. Is this possible? Thanks
Can the R720 server be configured for Storage spaces