Data transfers using Windows and copying files larger than 3Gb.

TechJunky · Jan 25, 2017

So in short.... I am copying or cutting a file from one location to another on the same drive and the MAX sustained speed I can get is 150MB/s transfer speeds within Windows. It doesn't matter if I am using an SSD, spindle disk, or raid array...

Shouldn't my transfer rates be faster? Just seems slow with advertised read/write speeds on SSD's showing 400-500MB/s.

Is anyone here doing any tweaking to get faster speeds on large files within windows?

||Console|| · Jan 29, 2017

I kinda see somthing similar if I transfer a file from one ssd to anther I get 500-450 for the first 2 gigs then it goes down to 75 -50

sno.lcn · Jan 29, 2017

It's because of disk cache. You'll often see storage reviews refer to a drive's low sustained write speed, which is how fast data can be written to the disk once that fast caching layer is full. If you're writing a large file, you get an initial burst of speed because you're writing to the disk's cache. Then that data is then offloaded to the disk's primary storage behind the scenes. But once that write cache is full, your write speed drops to that of the primary storage media on the drive, whether that's TLC NAND in an SSD or a spindle in a hard drive.

Alaric · Jan 29, 2017

sno.lcn said:
It's because of disk cache. You'll often see storage reviews refer to a drive's low sustained write speed, which is how fast data can be written to the disk once that fast caching layer is full. If you're writing a large file, you get an initial burst of speed because you're writing to the disk's cache. Then that data is then offloaded to the disk's primary storage behind the scenes. But once that write cache is full, your write speed drops to that of the primary storage media on the drive, whether that's TLC NAND in an SSD or a spindle in a hard drive.

Simple, concise, and easy to understand. That qualifies as an excellent explanation. :thup:

trents · Jan 31, 2017

The other thing here is that he is moving large sequential chunks of data. SSD technology's real advantage over spinners is negated in that scenario because there is little random seeking going on.

Data transfers using Windows and copying files larger than 3Gb.

TechJunky

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||Console||

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sno.lcn

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Alaric

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trents

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