The 'SecureConnect' cable includes the power and comms cables in one...I think, WD Site says
Important: Do not connect both the SATA and the legacy ATA power cable to the drive at the same time. This may result in damage to the drive. In order to take advantage of hot-plug capabilities for your Serial ATA hard drive, you must use the Serial ATA power connection, not the Legacy (Molex) power connection.
http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faqid=981&p_created=1052339456&p_sid=Bf4jOadi&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9NjEmcF9wcm9kcz0yMDMmcF9jYXRzPTEyMyZwX3B2PTEuMjAzOzIudTAmcF9jdj0xLjEyMzsyLnUwJnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfZm5sJnBfcGFnZT0x&p_li=&p_topview=1
...but then the WD page for the cable says,
Important compatibility note: When using the WD SecureConnect cable, you must use the legacy power adapter because the SecureConnect cable utilizes the SATA power port to provide additional stability.
http://www.wdc.com/en/products/accessories.asp?ProdID=74
Think I'll try plugging in the old power lead too ;)
Important: Do not connect both the SATA and the legacy ATA power cable to the drive at the same time. This may result in damage to the drive. In order to take advantage of hot-plug capabilities for your Serial ATA hard drive, you must use the Serial ATA power connection, not the Legacy (Molex) power connection.
http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faqid=981&p_created=1052339456&p_sid=Bf4jOadi&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9NjEmcF9wcm9kcz0yMDMmcF9jYXRzPTEyMyZwX3B2PTEuMjAzOzIudTAmcF9jdj0xLjEyMzsyLnUwJnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfZm5sJnBfcGFnZT0x&p_li=&p_topview=1
...but then the WD page for the cable says,
Important compatibility note: When using the WD SecureConnect cable, you must use the legacy power adapter because the SecureConnect cable utilizes the SATA power port to provide additional stability.
http://www.wdc.com/en/products/accessories.asp?ProdID=74
Think I'll try plugging in the old power lead too ;)