Rapid Storage Technology
Intel® RST, RAID
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[Rapid storage technology] eSATA speed drop (to SATA2)

JPark57
Beginner
1,066 Views

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
172 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
172 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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