I've been testing this Dell Precision T3400 x48 motherboard with SL for 2 weeks trying to get stable SATA0-5... minimizing the number of kext withing EXTRA\EXTENSIONS to the minimum seems to be key along with clean install from SL type drive. I've not changed my dsdt.aml in any way and once I removed such 64bit kext like jmicron, ioata, and duplicates like Null + Disabler (didn't realize they were somewhat duplicates) SATA0-5 behaves normally.

Ideally if you apply this "minimal kext" theory to the USB Install flash drive as well... you shouldn't need to disable SATA1-5 prior to install.. as the offending kext isn't present.

Once kextutility repairs all mkext and you reboot into 64bit SL... clicking on the Eject icon now immediately shows 2 DVD drives and all other throughput on hard drives & DVD drives SATA0-5 are normal.

I've only had this latest test running for 1 day.. but rebooted 3-5 times and SATA continues to be stable.

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Gigabyte GA-EP45-DS3L • OS X 10.6.3 Retail thru BootCD • QX6600@2,6GHz • 8GB Kingston 666MHz • PNY GeForce 8600GTX • AsereBNL 1.1.9 • BlackOSX 01/17 dsdt.aml • LegacyHDA

Asus Rampage Extreme x48 • OS X 10.6.3 Retail thru BootCD • HAF 932 • PSU Corsair HX-1000W • QX9770 @ 4.1ghz • 4GB OCZ 3P20002G @ 1800mhz • EVGA GTX-285 • Boot 2x VR 300GB RAID0 ICH9

Dell T3400 • 10.6.3 • x38 • QX6750 • 8gb • 9800GT • Voodoo HDA • Netgear GA-311