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Old 03-03-2013, 05:40 AM   #1
kooshini
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Default Samsung 840 Pro Slow Read Problems

I just bought a 256GB 840 Pro from amazon, It arrived today and I connected it to my 2 week old M5A97 EVO R2.0 however AS SSD bench reports 430MB/write and 3MB/s read - HD Tune Pro reports that I am getting <2MB read speeds and also reports warning in the health status to say the UDMA CRC errors reporting numbers of 7000+

Is this a faulty drive? I think it must be as I have tried in different motherboard ports, tried different cables etc.

My old Intel SSDSA2M080G2GC works fine and gets approx 200MB/s without a problem.

If anyone can suggest anything before I RMA the drive and go and buy an OCZ vector tomorrow I would be grateful.







This is my intel on AS SSD



Intel Anvil (AMD drivers)



Intel Anvil (Windows drivers - storageahci)



This is a spare drive - on the same cables on the same board.

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Old 03-03-2013, 07:18 AM   #2
Deders
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How did you format the drive? Are the sectors 4K aligned?
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Old 03-03-2013, 07:35 AM   #3
kooshini
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just let windows handle that on install (clean)
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Old 03-03-2013, 07:53 AM   #4
Deders
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try typing (or copy and paste) wmic partition get Name, StartingOffset into the command prompt (open cmd in the start menu) and see if the result for your drive can divide by 512 to get 4. I had to divide mine by 512 twice which means it's ok.
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Old 03-03-2013, 08:01 AM   #5
kooshini
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Microsoft Windows [Version 6.2.9200]
(c) 2012 Microsoft Corporation. All rights reserved.

CUsers\Chris>wmic partition get Name, StartingOffset
Name StartingOffset
Disk #0, Partition #0 8225280
Disk #1, Partition #0 1048576
Disk #1, Partition #1 315621376
Disk #1, Partition #2 554696704


CUsers\Chris>
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Old 03-03-2013, 05:57 PM   #6
kooshini
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OK, this is strange.

I bit the bullet because I was going to RMA my drive and went and bought another 840 Pro from a local retailer.

This performed great I was getting approx 500Mb/s read/write out of the box.

Thinking that it was just a bad first drive it prompted me to get a a firmware upgrade, after the reboot I was back to slow speeds again. So I decided to try Linux.

I ran Ubuntu 12.10 off the CD and ran speed tests - both the drives are fine running at 560MB read and about 530MB write. I have even put them into raid and Ubuntu reports 1.1GB/s read speed and around 1GB/s write.

The raid set-up doesn't seem to like windows 8 even though I have loaded the driver from a CD at install.

I have secure wiped and set-up AHCI mode again as (separate drives) and I have just tried with Windows 7, same issue with slow speeds even with the chipset drivers from ASUS website. It seems like anything Windows on my motherboard on this firmware doesn't work but Linux is fine....

Any ideas?
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