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 Post subject: Gradually Decreasing Speed
PostPosted: February 13th, 2022, 13:32 
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Joined: February 13th, 2022, 13:25
Posts: 2
Location: United Kingdom
Hi,

I'm trying to copy a 2TB image (.imgc) to a 2TB 3.5" HDD. Same model hard drive as image was taken from. My write speed starts at 50.0MB/s but slowly and gradually reduces. 3 hours in and it's now at 24.4MB/s. This is the third time trying to write this image. Any help?

I'm using a FIDECO SG3-PL03 adapter.

Thanks in advanced.


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 Post subject: Re: Gradually Decreasing Speed
PostPosted: February 14th, 2022, 8:59 
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Joined: November 7th, 2020, 5:31
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Location: The_UK
Need far more info than that.

Are you copying a single 2tb image file or recreating the drive volume from an image?
Operating system ?
Make and model of the drives involved ?

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 Post subject: Re: Gradually Decreasing Speed
PostPosted: February 14th, 2022, 18:28 
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Joined: February 13th, 2022, 13:25
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Location: United Kingdom
I've added a picture of the screen with details.

Was a 2TB image to a 2TB Seagate Barracuda SATA drive.

Eventually completed 100% after around 26 hours.


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 Post subject: Re: Gradually Decreasing Speed
PostPosted: February 15th, 2022, 3:19 
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Joined: November 7th, 2020, 5:31
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Ah I see what you were doing.

AFAIK the free version hddrawcopy is limited to 50mb/s max, so that explains the initial transfer rate. The ST20000DM is SMR which probably caused the drop off in performance.

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 Post subject: Re: Gradually Decreasing Speed
PostPosted: February 16th, 2022, 19:25 
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Joined: June 17th, 2019, 21:15
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The slow can also be caused by the source from where you read the image file.

I think this drive can full complete a sectors image copy at the limit of 50mb/s, but it have to also success reading at the right bandwidth, and it is also hardware independent with a right config to the right UDMA speed.


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 Post subject: Re: Gradually Decreasing Speed
PostPosted: February 16th, 2022, 20:58 
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Joined: June 17th, 2019, 21:15
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Sorry, I would say hardware dependent, but it's surely not UDMA config story as you start at about 50mb/s.
So I suggest you looking at what is going on with your source drive.


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