Uncached Disk Speed

[Rick]

"C" and "D" drives are Samsung and Western, both 40g with
transfer rates around 1050mb. Master and Slave on primary,
master and slave on secondary are burner and cd. The
question is why is the uncached speed on the "C" 10mb and
the "D" only 0.67mb? Yes, disk cacheing is enabled. Bios
flash screen on boot shows UDMA/66 on both and UDMA/33 on
the burner and cd. Some switch somewhere isn't flipped but
I can't find it. Thanks for any input

 

[Bob Willard]

"C" and "D" drives are Samsung and Western, both 40g with
transfer rates around 1050mb. Master and Slave on primary,
master and slave on secondary are burner and cd. The
question is why is the uncached speed on the "C" 10mb and
the "D" only 0.67mb? Yes, disk cacheing is enabled. Bios
flash screen on boot shows UDMA/66 on both and UDMA/33 on
the burner and cd. Some switch somewhere isn't flipped but
I can't find it. Thanks for any input

I suspect you are getting your HD speed measured by Sandra.
Sandra is a nice program, but IMHO it produces really bad data for
HD speed, because it tries to measure HD speed by issuing commands
through the OS's filesystem (and its caches). If you want reliable
data about HD performance, try HDtach.

 

[Rick]

Thanks, I'll let you know the results.