Quote Originally Posted by Fernando View Post
Exactly: You have to clean the registry from a faulty iaStorF entry, which has been forgotten to erase by the RST(e) drivers uninstall procedure.
You can easily verify, if you are effected by this issue, when you open the Device Manager and look into the driver details of your drives (right click > "Properties" > "Driver" > "Driver Details"). If you should find the iaStorF.sys there and within the Windows\system32\Drivers folder as well, you got the performance decrease by the SCSI filter driver iaStorF.sys, which is still active, but cannot really be used anymore.
Warning:
Don't try to delete the iaStorF.sys from the Drivers folder, because this will induce a BSOD at the next restart.
Solution:
Run the regedit command, open the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E967-E325-11CE-BFC1-08002BE10318} or similar and delete the word "iaStorF".
After having restarted your PC everything should be fine again. You will even be able to delete the iaStorF.sys from the System32\Drivers folder.
Hi Fernando, I was wondering if you could give me some advice here, I currently own a Samsung 840 Pro 512gb, no raid, just 1 drive. I have x79 Asus Sabertooth motherboard. I tried the RSTe V3 drivers and they write capped my drive in a horrid way, less than 3mbps on the 4K. I uninstalled the V3e drivers and used the msachi driver and it was a dramatic improvement but not what I got on the first run of Anvil Benchmark. I looked in the registry and there was an entry for the IASTOR.F driver exactly where you said it would be.



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After deletion my Anvil with the msachi driver was better but not close to the first run after a clean install of Windows 7 64bit. Now what IRSTe driver should I use or should I just continue with the masachi driver?