Hello,

I , unlike most people, am looking for a way to SLOW down my SATA drives.

I am using IDE instead of AHCI, which helps, but I want to be able to lower the UDMA mode.

I am using Windows 8.1 64 bit and all the tools (including DOS tools) I have found I can not get to work.

Windows is telling me my current UDMA mode is 5. I would like to lower that to 2 or 3.

Any ideas?

Best Regards,

skibum

Any reason for that?

Slowing HDD

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Kuwait Data Recovery - UNIX GTC
The only reason for time is so that everything doesn't happen at once. By: Albert Einstein

Maybe wants to play an old DOS game.. or has a mistaken Idea it will somehow lengthen the life of the HDD..
But if there is a tech reason I am interested!

I kinda figured the "why" question would come up.

No, it is not to do with an old DOS game or to lengthen the life of my drive.

I am an electrical engineer and doing experiments on reducing EMI/RFI. We have an anechoic chamber and other devices where we can measure the affect of this. For what we are working on we need extremely low radiation. Speed of data transfer is not needed. 30MB/sec is enough.

We tried just shutting DMA off, but we were getting about 1-3MB/sec and that was just to low for the computer to work.

2 Options for u here:

1- if you were lucky, buy some of the OLD drives and test instead of using new Tech. (old Conner MAYBE)

ref. http://www.computerhope.com/hdd/hdd0060.htm


2- very funny, but will work, use FLASH/Mem card for the OS - the old models

both options, will give you the LOW speed, #1 noisy #2 Silent.

sounds good?

all the best :>

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Kuwait Data Recovery - UNIX GTC
The only reason for time is so that everything doesn't happen at once. By: Albert Einstein

Why not try with SSD?

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All went well until I plugged the drive in.

Actually we are using SATA SSDs in IDE mode. I want to use SSDs.

I was hoping there was some software tool or registry hack that would allow me to lower the UDMA Mode from 5 (where it is now) down to 2 or 3.

There use to be quite a few of UDMA utilities 10-15 years ago, but I have yet to find one that will work in Windows 8.1 64 bit.

FWIW, external drives connected via USB 2.0 are typically limited to sustained transfer rates of 30MB/s.

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A backup a day keeps DR away.

Thanks for that - I do not want to be difficult, but I really want to use the SATA connector on the motherboard.

What I would like is a Windows software utility, DOS tool or registry hack that works with Windows 8.1 64 bit.

What SATA controller do you have ?

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All went well until I plugged the drive in.

I am using a LGA1150 Haswell i5 CPU with a B85 Chipset motherboard. The motherboard has two SATA2 connectors and two SATA3 connectors.

Looking at this wiki page:

http://en.wikipedia.org/wiki/List_of_In ... s#LGA_1150

It appears I am using a Lynx Point DH82B85 chipset.

What's the SSD model?

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All went well until I plugged the drive in.

Crucial V4 32 GB:

http://www.crucial.com/wcsstore/Crucial ... 5mm-en.pdf

@skibum, I had an idea, but it seems you have already tried it.

http://www.eightforums.com/drivers-hard ... still.html

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A backup a day keeps DR away.

I'm curious: did you check whether the transfer rate lowered to 1-3 MB/s actually results in an acceptably (noticeably) reduced EMI for an SSD?

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• Remote RAID, NAS, SAN, VMware, DVR (CCTV), flash and tape recovery. Data recovery support.

Actually no, we had too many computer problems at that transfer rate. We can tell a difference between SATA2 and SATA3 though.

As i said before, you may go with #2 with old MicroSD or Mem. cards fixed in Sata Converter this should give u lower speed

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Kuwait Data Recovery - UNIX GTC
The only reason for time is so that everything doesn't happen at once. By: Albert Einstein

[quote= As i said before, you may go with #2 with old MicroSD or Mem. cards fixed in Sata Converter this should give u lower speed[/quote]

Yes, thank you! - great idea. It will work, but would be a bit cleaner if there was some software way to do it with modern SSDs.

Actually I've got several OS'es in my oldie multi-cardreader and its speed is up to 23MB/s reading and up to 10MB/s writing.
Now as for HDD's, once I used HDAT2 software to limit the max speed (as a friend of mine asked to let her couple of new SATA2 with--GOSH!--less than a dozen rellocates to last longer). It worked really fine, however some drivers occasionally did keep reverting back to udma5+, can't remember was it systerm restoring or something though.


Interesting, I remember my p4 "prescott" with award BIOS having 'Spread spectrum' option which made the PC working...er, strangely, especially when IDE and SATA-150 (in IDE mode) were connected together.