Western Digital My Book VelociRaptor Duo Review
Test Setup and ATTO Disk Benchmarks
As we mentioned earlier, the My Book VelociRaptor Duo is geared for Macs, and the unit ships with the drives striped in a RAID 0 array for maximum performance and formatted with the HFS + Journaled file system. Because we tested the device in the Windows environment as well, we had to reformat to NTFS, and because of the current lack of support for Windows we had to test with the drives set up as JBOD. We’ve been told that a firmware update enabling RAID in Windows is coming, but it wasn’t ready in time for us to test it out. Thus, note that our normal spate of performance numbers we're showing here will go up when the drives are striped in RAID 0.
** RAID 0 and Mac Testing: We did, however, also run a couple of tests with a MacBook Pro, so you can at least see some hard numbers on read and write speeds with RAID 0 configured.
ATTO is a "quick and dirty" type of disk benchmark that measures transfer speeds across a specific volume length. It measures raw transfer rates for both reads and writes and graphs them out in an easily interpreted chart. We chose .5kb through 8192kb transfer sizes and a queue depth of 6 over a total max volume length of 256MB. ATTO's workloads are sequential in nature and measure raw bandwidth, rather than I/O response time, access latency, etc. This test was performed on blank, formatted drives with default NTFS partitions in Windows 7 x64.
In both the read and write tests, the My Book VelociRaptor Duo got off to a rather slow start, but once the test got past the 4K transfer size mark, it exploded. The only drive in our test bank that did better was another 1TB VelociRaptor SATA hard drive, which was mounted as an internal drive.