WD的Q&A
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http://wdc.custhelp.com/cgi-bin/wdc...li=&p_topview=1

Q: Do Western Digital Serial ATA hard drives support NCQ or TCQ?

A:
* All capacities of the Western Digital Caviar RE2 Serial ATA hard drives (models WDxxxxYR and WDxxxxYS) support Native Command Queuing (NCQ).


* The 400GB and 500GB WD Caviar SE16 hard drives (models WD4000KS and WD5000KS) support Native Command Queuing (NCQ).


* The 160GB WD Caviar SE hard drive (model WD1600AAJS) supports Native Command Queuing (NCQ).


* The 150GB Western Digital Raptors (models WD1500ADFD and WD1500AHFD) support Native Command Queuing (NCQ).


* The 74GB Western Digital Raptor (model WD740GD) hard drive supports Tag Command Queuing (TCQ). This drive does not support Native Command Queuing (NCQ).