seethruskin:
No big surprise here. I had a look and all the Apple HDD's seem to have custom Firmware limiting them to SATA I despite the drives being SATA II drives when bought aftermarket:
| | | +-o PRT0@0 <class AppleMCP79AHCIPort, registered, matched, active, busy 0, retain 10>
| | | | | "Controller Characteristics" = {"Vendor Name"="NVidia","Port Description"="AHCI Version 1.20 Supported","Product Name"="MCP79 AHCI","Port Speed"="3 Gigabit"}
| | | | +-o IOAHCIDevice@0 <class IOAHCIDevice, registered, matched, active, busy 0, retain 11>
| | | | | "Protocol Characteristics" = {"Physical Interconnect"="SATA","AHCI Port Number"=0,"Physical Interconnect Location"="Internal","Port Speed"="1.5 Gigabit"}
| | | | | }
| | | | |
| | | | +-o AppleAHCIDiskDriver <class AppleAHCIDiskDriver, registered, matched, active, busy 0, retain 6>
| | | | | {
| | | | | "Model" = "Hitachi HTS545050B9SA02 "
| | | | | "Revision" = "PB4AC60Q"
| | | | | "CFBundleIdentifier" = "com.apple.iokit.IOAHCIBlockStorage"
| | | | | "IOMatchCategory" = "IODefaultMatchCategory"
| | | | | "Queue Depth" = 32
| | | | | "IOMaximumBlockCountRead" = 65536
| | | | | "IOProviderClass" = "IOAHCIDevice"
| | | | | "Physical Block Size" = 512
| | | | | "IOMaximumBlockCountWrite" = 65536
| | | | | "IOPolledInterface" = "not serializable"
| | | | | "IOClass" = "AppleAHCIDiskDriver"
| | | | | "SATA Features" = 15
| | | | | "NCQ" = Yes