80gb Seagata SATA VERY slow reading (ST380013AS)

Hello,
before I will return my drive i'd like to know if someone had the same problem before:
A few weeks ago I set up my brandnew system.
I used two ST380013AS for RAID0 Configuration - everything was fine.
But after a few days, XP got slower, a few days later, it got even slower...
I reinstalled a few times with and without RAID0 and found out, that ONE of both disks i very, very slow when reading from it.
AIDA32 Disk benchmark tells me a read performance of 1.5mb/s of this drive - normal is about 55Mb/s - write performance was still at 55mb/s
It seems like it does many pauses during read accesses.
I tried different cables, swapped the drive connectors, used the slow drive on the other sata controller (ich5 instead of promise)
Still the same problem.
SeaTools diagnostic software did not find any S.M.A.R.T. error, drive selftest ist 100% ok (but it's slow, even from this dos diskette - so it's NOT my Windows XP!)
I wonder if this maybe is an incompatibility between the drive electronics and the mainboard/bus. But it's strange, that it got slower and slower...
And the other drive (same model!) just works without any problems.
Any idea what could be the cause for this?

vango, you are right, we have the same setup. NEO fis2r board with two ST380013AS.
I was happy with it when both drives were working - unfortunately I don't remember the performance of my RAID0 setup I used.
Now I'm running a single drive and performance is still good ( I'm happy with 55mb/s linear read )
What's a little bit strange is the fact that both drives run at UDMA5 - no matter which controller I use..
But I remember seeing UDMA6 when using RAID0 with the latest Promise drivers from http://www.msi.com.tw - but I'm not sure.
But the latest Promise drivers for non-raid mode is from january 2002 - so it's really outdated.
For a single drive it shouln't make any noticable difference.
And for AIDA32... it's really one of the best system tools I've ever seen.. it displays even temperature, voltages, memory timing, .... I love it
The integrated database with all these values you cannot read out from the hardware and you had to look up yourself is very good! Even with vendor links!
Well, I think I'll get an RMA number from Seagate and exchange the drive.
Maybe I'll be running RAID1 afterwards as I'm sick of reinstalling XP with all the drivers, patches, and so on. (I can mirror the old system drive without losing data)

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Has anyone else seen Windows Server 2012 Storage Spaces with a Simple RAID 0 (also happens with Mirrored RAID 1 and Parity RAID 5) virtual disk exhibiting extremely slow read speed of 5Mb/sec, yet write performance is normal at 650Mb/sec in RAID 0?
Windows Server 2012 Standard
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I thought SAS was going to be a sure bet for expanding beyond the capacity of port limited eSATA adapters, but after a week of frustration and spending over $5,000.00 on drives, controllers and cabling, it's time to ask for help!
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1) Yes, being slow either on reads or on writes is a quite common situation for storage spaces. See references (with some of the solutions I hope):
http://social.technet.microsoft.com/Forums/en-US/winserverfiles/thread/a58f8fce-de45-4032-a3ef-f825ee39b96e/
http://blogs.technet.com/b/askpfeplat/archive/2012/10/10/windows-server-2012-storage-spaces-is-it-for-you-could-be.aspx
http://social.technet.microsoft.com/Forums/en-US/winserver8gen/thread/64aff15f-2e34-40c6-a873-2e0da5a355d2/
and this one is my favorite putting a lot of light on the issue:
http://helgeklein.com/blog/2012/03/windows-8-storage-spaces-bugs-and-design-flaws/
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http://social.technet.microsoft.com/Forums/en-US/winserverClustering/thread/5d4f68b7-5fc4-4a3c-8232-a2a68bf3e6d2
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file:///Users/new/Desktop/screenie.png
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