comitter said:
limiting the speed to 1.5Gbs, or if left empty then it's 3gbs
operation.
Which to me it doesn't have sense ...
so why is this place jumpered on 1.5Gbs, when we know puting the hard
drive on both connectors, it will adapted automatically....!?
Because some SATA controllers were designed wrong and won't adapt
automatically. According to SomeJoe7777 at Tom's Hardware, they
include:
Via VT8237
Via VT8237R
Via VT6420
Via VT6421L
SIS 760
SIS 964
Intel 82801EB (ICH 5/5R)
I'm not sure about the Intel 82801EB because I have a Dell Optiplex
GX270 with Intel 865G chipset, which I think includes the 82801EB
chip, and I've had no problems using this computer with Samsung,
Hitachi, Seagate, and WD drives configured for 3.0Gb/s. OTOH those
VIA chips definitely won't work at all with them and require SATA
drives be limited to 1.5Gbs, regardless of the driver or BIOS. VIA
gives the excuse that those chips are old, but even older 1.5Gb/s SATA
chips from Promise (Marvell), Intel, and I think Silicon Image get
along just fine with 3.0Gb/s drives.