sata 3 drive slow speed only 85 read speed!!!! it must be 126 speed!!!!! help

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synphul

synphul

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Mar 11, 2011
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Did you enable ahci? Also, it depends what speed you're referring to. From the listings I could find for that drive, regardless if it's sata2 or 3, the 126 speed is max internal speed (rated between the hdd and it's cache). 85mb/s actual read speed (external speed) sounds about normal. Only very minimal info will actually be read/written to and from the hdd platters and it's onboard cache, the real speeds you can expect are external (hdd to the rest of the system). Have you tried hdtach to see what it says?
 
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synphul

synphul

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Mar 11, 2011
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It depends on how you test the drive. There's a ton of different tests available. Burst (max) rate might be close to those numbers yes. The listing for that specific drive the op listed said 126MB/s transfer rate (buffer to disk). Buffer being the internal rate. Data throughput accounts for internal and external data transfer rates and the sustained rate is often lower because it doesn't benefit from the buffer cache. That's why on hdtune results you'll often see various performance listings.

One that came off a wdc 500gb hdd said burst rate of 132.3MB/s. Max speed recorded was 118.6MB/s. Min was 57.1MB/s and gave them an average of only 95.7MB/s - a far cry from the advertised 'burst' of 132MB/s. Depending on file location, fragmentation, how full the drive is etc etc could also impact the scores even with identical hard drives.

 
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popatim

popatim

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Dec 2, 2009
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WDC lists the Sustained transfer rate (Disk to host) as 126MB/s. I have to agree with these guys that are saying 85 is not normal.

Jim, how did you format your drive? And yes the format type can affect its overall speed.
Are there any partition in front of the main partition that you are testing? or is there only 1 partition...

Can you enter the bios and make sure you are still set to AHCI for the Sata Port Type setting.

Thank you.
 
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synphul

synphul

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Mar 11, 2011
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I agree, format specifics can affect drive speed. So far we don't have a whole lot to go on. The op just listed a couple of speeds, no info on how they got them, where they got them, what type of test they're running - is it 4k blocks, 8k blocks, larger? Is it short test, long test.. are they looking at random read, sequential read? Does the op know what the original format type was compared to what it is now? (ie, were they using 4k blocks before and 16k now or vice versa?). Are they doing data transfers (such as music or videos) where the same transfer before at 5min is now taking them 8-10min?
 
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