File transfer issue

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mongydog
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File transfer issue

Post by mongydog » Sat Jan 30, 2016 1:17 pm

Can anyone tell me why when i copy and paste a large file the transfer rate starts blisteringly fast then slows down towards the end of the transfer to as little as 2mb per second.
I am running cinnamon amd64 (latest)on an up to date Toshiba Satellite with Intel chip-set and 8gb ram.
I am new to Linux so cmd line is like a foreign language. Changed to a proper O.S after trying Win 10 and finding microsoft was leading me by the nose to use microsoft software which irritated me. Vowed I won't go back so i'm in it for the long run
Last edited by killer de bug on Sat Jan 30, 2016 1:25 pm, edited 1 time in total.
Reason: language!

vanadium
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Re: File transfer issue

Post by vanadium » Sat Jan 30, 2016 1:38 pm

You are copying to a USB drive? Copy tranfer at first goes very fast because in fact it just goes into the memory buffer, to be written from there to the destination. For a big file, the buffer eventually fills, and then writing speed slows down to the speed of the device. 2 MB/s is very low, though, which would be numbers, I guess, for a network transfer or an aged USB disk.

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Reorx
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Re: File transfer issue

Post by Reorx » Sat Jan 30, 2016 1:45 pm

mongydog wrote:Can anyone tell me why when i copy and paste a large file the transfer rate starts blisteringly fast then slows down towards the end of the transfer to as little as 2mb per second?
At the beginning of the copy operation, the "blistering" speed is buffering (writing the copy to RAM buffer)... at the end of the copy operation (once the buffer is "full"), what you are seeing is (close to) the actual write speed of the device you are writing to...
Full time Linux Mint user since 2011 - Currently running LM19 Cinnamon.

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mongydog
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Re: File transfer issue

Post by mongydog » Sat Jan 30, 2016 6:40 pm

Thanks guys, I guess I need to buy better USB sticks! Lesson learned.

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LinuxJim
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Re: File transfer issue

Post by LinuxJim » Sat Jan 30, 2016 7:14 pm

mongydog wrote:Thanks guys, I guess I need to buy better USB sticks! Lesson learned.
There are a LOT of grey-market USB sticks out there coming from China whose advertised speeds and capacities are nowhere near the actual specs of the device.

There was a large number of 32GB "Sandisk" sticks distributed to Wal-Mart last summer that weren't made by SanDisk, but rather a Chinese knock-off that (illegally) used SanDisk packaging and logos. The sticks were really 2GB capacity that had been modified to report themselves as 32GB. By the time most people realized what was wrong, it was too late to return them.

So, even if you go for the name brands, you can't alyways be sure of what you're getting...

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