Which component delivers the speed transferring from sd to hdd

454Casull

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Feb 23, 2015
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Rather than spend countless hours reading to find the answer, can someone chime in on the question? Which of these components most affects the speed of transfer from sd card to hdd? Atom 570, 1 GB RAM or N3530, 4 GB RAM. With the current Atom, a transfer of 28 GB takes approximatey 45 minutes. Will the faster processor with more RAM shorten that apprieciably?
 
Solution
It's going to be the slowest link in the chain. There are other variables other than the CPU and RAM, and I think neither is really that involved in the process.

Likely the biggest bottleneck with be the SD card reader. Many are USB 2.0 devices, and will be limited to the 480Mbps nominal speed of that bus, unless the continuous read speed of the SD card is less. (Flash cards sometimes boast their burst speeds which can be much higher.)

So look at the following to determine the bottleneck in your case:

Continuous write speed of your hard drive
Hard drive connection type and the controller's throughput
Card reader's connection type and throughput
Card's continuous read speed.


Saberus

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It's going to be the slowest link in the chain. There are other variables other than the CPU and RAM, and I think neither is really that involved in the process.

Likely the biggest bottleneck with be the SD card reader. Many are USB 2.0 devices, and will be limited to the 480Mbps nominal speed of that bus, unless the continuous read speed of the SD card is less. (Flash cards sometimes boast their burst speeds which can be much higher.)

So look at the following to determine the bottleneck in your case:

Continuous write speed of your hard drive
Hard drive connection type and the controller's throughput
Card reader's connection type and throughput
Card's continuous read speed.


 
Solution

454Casull

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Feb 23, 2015
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well the faster processor has the usb 3.0 and the atom does not. The sd cards are Class 10 UHS-1. My reading has me believe that the UHS-1 is usb 3.0. So, yes the card reader will be the bottleneck. I'm fairly confident that the faster processor will also be faster to use than this *%* atom. Thanks for your knowledge.
 

Saberus

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Just because the card is Class 10 UHS-1 doesn't mean the reader is. I would identify the card reader and check it's specs. While the faster processor might be an overall benefit, it will be better to know beforehand if it will have any effect on your data transfers or if some other device is holding it up.

28GB in 45 minutes is about 10MBps. This sounds typical of a USB 2.0 card reader.
 

454Casull

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Feb 23, 2015
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4,510
As you said, the usb 2.0 reader on my current atom computer is the slowpoke. I wasn't sure if the card was usb 2.0 until this prompted me to look it up at the Kingston website. So going with the new computer with the faster processor AND usb 3.0 reader will be faster solution to my problem.
 

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