View Full Version : 3Gbps vs 1.5Gbps

02-15-2008, 06:46 PM
Hmm. There's a jumper on the Seagate SATA drives that states it limits the drive to 1.5Gbps operation. Removing it allows 3Gbps... Will this make a difference at all in a direct connection Raid0 to a MacPro or is the drive speed limited to the actual mechanism?
Why would this option be on the drives?


02-15-2008, 07:22 PM
Weird part is, that jumper has absolutely nothing to do with drive speed. All it does is turn Spread Spectrum Clocking (SSC) on or off. Nothing else at all is affected.

SSC being on will break a lot of SATAI buses, including the one in early G5 computers. A lot of PCs also shared this issue. So Seagate put a jumper on the drive to handle that.

You got me why they called it SATA150 or SATA300. Some marketing genius made that decision.

For the most part you can ignore that jumper. SSC isn't a very useful feature on desktop computers. On your MacPro the drive will work perfectly with it on or off.


02-16-2008, 11:02 AM
thnx, R
Good to know.