Western Digital Silently Updates Raptor Series
May 27, 2006 12:01 AM
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More cache for WD Raptor
Western Digital's line of enterprise class hard drives have been favorites of enthusiasts since the first 36GB model was introduced and it still takes the crown in performance in both standalone and RAID configurations.
Western Digital silently updated two of its Raptor series drives: the
10,000RPM models have been blessed with doubled buffers to 16MB each. The performance specifications have improved over the 8MB cache models along with a slight increase in power consumption. The new models also add Native Command Queuing to the list of features, a change from the older Tagged Command Queuing method.
Among the performance updates are increases in 'Buffer To Disk' sustained transfer rates of 84MB/sec up from the previous models' 72MB/sec as well as lower overall average seek times. The updated 36GB and 74GB Raptor models are also 3 dBA quieter in the idle state. However, both drives still carry a SATA 1.5Gbps throughput rating.
These updated models are not shipping yet, but retails tell us the drives should appear within the next few days. Interestingly enough, the new models come just hours after Western Digital cleared up its
customer loyalty program
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TCQ v. NCQ?
5/27/2006 2:07:07 AM
I was under the impression that all things being equal, TCQ was preferrable to NCQ as TCQ allows for "interrupt requests" to be inssued in the Hard Drive Request Queue, while NCQ does not (essentially that NCQ only takes into account reducing seek time based on disk position, whereas TCQ focuses on reducing user wait time by reording the request Queue to reduce/hide HDD loads/reads).
RE: TCQ v. NCQ?
5/27/2006 8:52:20 AM
TCQ is better, but nobody wanted to support it. NCQ actually hurts performance in many scenerio's, much like Intel's hyperthreading. the overhead involved robs precious controller processing cycles, hurting performance. so much time is spent designing a 'path' for the actuator to travel that it might as well just gone a random route anyway.
TCQ has just that technology to prevent this type of situation: interrupt requests.
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