Gradually Decreasing Speed

[satansgutter]

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.

[Lardman]

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 ?

[satansgutter]

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.

Attachments

[Lardman]

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.

[diybit]

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.

[diybit]

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.