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JPark57
Beginner
1,007 Views

[Rapid storage technology] eSATA speed drop (to SATA2)

Intel SSD eSATA speed drop (from SATA3 to SATA2) by RST

Hi, I'm using intel SSD 730 480GB(AHCI mode), Asrock Z97 extreme 6 motherboard, Win 8.1 x64 (genuine)

 

When I use intel SSD as a external drive thru e-SATA 6g(via SATA-eSATA bracket), there's strange thing happend.

At first, it transfers data using SATA3 bandwidth, 480MB/s.

 

However, after transfering SOME(5~8GB) data, the speed drops down to 250MB/s using SATA2 bandwidth.

 

Looking for a solution, I found it is caused by a Intel Rapid storage technology driver. (Irst)

 

Uninstalling Irst makes the symptom gone away! (transfering speed is 460MB/s)

 

While I install irst (regardless of version) the bandwidth always go down to SATA2.

 

Why does this happen?

I tried rst version

 

13.1.0.1058

 

13.2.0.1016

 

13.2.4.1000

 

13.2.5.1012

 

13.5.0.1056

 

13.5.2.1000

 

13.6.0.1002

 

13.6.2.1001

 

14.0.0.1081
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2 Replies
Jose_H_Intel1
Employee
113 Views

Did you check for a possible fix in a BIOS update?

You may not need to use Intel® Rapid Storage Technology since you are not managing RAID arrays.

JPark57
Beginner
113 Views

Yes, I did update BIOS. *always uptodate checking thru the internet.

AFASK, Intel rst is not just for RAID system.

As a matter of fact, IRST makes my SSD 21% faster in 4K write !

I tested SATA link many times, it always works nice, but it's not the case for E-sata connection.

I think Intel didn't test e-SATA at all d/t it's not the common way to transfer data.

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