why my SATA disk so slow?

[Surfer]

My SATA has only ~ 5M/s transfer rate. (whereas my old ATA disk has 50M/s).
same transfer rate for channel 2 and 3!
I thought even for SATA 1, the transfer rate should be 1.5G bps (SATA2: 3G
bps)
(My SATA disk is Seagate 250G 8M buffer).
Anything wrong?

Any program to test it with more objective result?

 

[Gary Chanson]

My SATA has only ~ 5M/s transfer rate. (whereas my old ATA disk has 50M/s).
same transfer rate for channel 2 and 3!
I thought even for SATA 1, the transfer rate should be 1.5G bps (SATA2: 3G
bps)
(My SATA disk is Seagate 250G 8M buffer).
Anything wrong?

Any program to test it with more objective result?

Probably a bad device driver...

 

[Surfer]

Gary,
Thanks for your advice
I went to my main board's website and download the latest driver and
re-installed again.
It had some improvement and the speed now up to 40M B/s (but still blow the
PATA's 50M B/s). I thought it should be at least somewhere near 100M B/s (
with the standard SATA I speed as 1.5G bps). Is it normal for a SATA I disk
to have only around 40-50M B/s ?

In updating my drivers, I had to install the RAID driver also ( though my
setting in the BIOS was only as IDE disk drive, NOT RAID). Does it related
to RAID setting in order to get the transfer rate improve?

I also checked the disk type under the Device Manager of My Computer's
System Property, it report my SATA disk as SCSI Disk device ! Is it OK? Why
a SATA disk was recognized as a SCSI disk?

Thanks

 

[Gary Chanson]

Gary,
Thanks for your advice
I went to my main board's website and download the latest driver and
re-installed again.
It had some improvement and the speed now up to 40M B/s (but still blow the
PATA's 50M B/s). I thought it should be at least somewhere near 100M B/s (
with the standard SATA I speed as 1.5G bps). Is it normal for a SATA I disk
to have only around 40-50M B/s ?

It depends on how fast the drive can read data from the disk, not
necessarily the speed of the interface. Most 7200 RPM drives can't send data
much faster then a good 133MHz PATA interface can handle.

In updating my drivers, I had to install the RAID driver also ( though my
setting in the BIOS was only as IDE disk drive, NOT RAID). Does it related
to RAID setting in order to get the transfer rate improve?

RAID can give you improved performance, depending on the type of RAID
array. Some RAID controllers don't perform as well as others.

I also checked the disk type under the Device Manager of My Computer's
System Property, it report my SATA disk as SCSI Disk device ! Is it OK? Why
a SATA disk was recognized as a SCSI disk?

That is normal.