Recently I had hands on brand new Dell Server – Storage NX3230. It is dedicated network-attached storage (NAS) solution from Dell that runs Windows Storage Server 2012. Interesting thing is, that it has two additional SAS 300GB 10K HDD drives located at the back. These are additional drives, connected in mirror RAID, used exclusively by Windows OS, and with reading speed of about 200 MB/s.
Also, it is worth to note, that Dell have updated/improved its PERC raid controller (PERC mini in this case). And in our test setup with 4 drives and 1 hot-spare in RAID 10, it reads 400 MB/s. Megabytes, not Megabits!