I've seen various consumer SATA RAID arrays record write throughputs around
30 to 60 MB/second, which implies that the individual drives rarely deliver
more than 15 MB / second, and that would be for contiguous data.

70MB/s is OK for more-or-less modern SATA drive. The run seems to be long
enough to not be influenced by the cache.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation

http://www.storagecraft.com