tyvm for answer and info mciahel.
ths helps w/ decision of 2.5" HDD SATA-150 vs -300, both were offered for laptop.
curious and checking my backup HDDs, have 2 (maxtor onetouch 3 mini/portable, and maxtor onetouch 3 firewire800/firewire400/usb2.0), though i dont believe the laptop's sata controler has effect w/ the backup HDD's. i am considering changing to different type backup storage that i learned of in the forums earlier, which can put in portable versions software(eg, skype, and mozila firefox browser) for laptop.
the SATA-150 vs -300 mystery answered, thx again.