Um, no way. It is still over its real performance by probably at least 10 times, if not 500 times. That number (270 MB/s) would be about in line for an SSD, but is far too high for a mechanical HDD like this – even though it is a 10K RPM drive. Check out the tests on page three – sequential write (the first test) is about 135 MB/s, this is about twice that. HDDs have random speeds vastly lower than their sequential speeds. The random speeds shown on page three (second test) are only 0.6 MB/s.Running AIO-Stress on the Western Digital VelociRaptor was yielding speeds not technically possible for the Serial ATA 3.0 hard drive when using EXT4 and XFS. There was obviously some caching / lack of committing to disk involved that led to faster performance while the Btrfs file-system was in line with real-world expectations out of the random write disk test.