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Solved Portable SSD not giving full write speed

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maxim123

maxim123

PCHF Member
Aug 2, 2017
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#1
Hi, I bought SANDISK 1TB portable ssd Model: SDSSDE30-1T00 yesterday.
I tested copying files in it, and the average speed is about 70-80 mb/s. There are few moments where at the start it crosses 200 mb/s, but it immediately goes back to around 70 mb/s speed. I am using it on a laptop, and the port I connected it is the blue one meant for USB type 3. I checked its theoretical write speed in cmd, and it shows speed of 260 mb/s to 330 mb/s, not sure if it is just for the first few moments.
I am not sure if my BIOS is outdated or if there are other issues to check here.

Thank you.
 
#2
1676015653247.png


1676015761539.png


two screenshots of the performance in taskmanager while copying files from Drive D to Drive E (Portable SSd drive).
 
#4
first up you have to accept the theoretical speeds they advertise will only occur when the planets are aligned.
then factor in the USB bus speeds, and the way Windows prioritises resource sharing for high demand jobs, and then realise that copying 100 small files is vastly different than copying two large files.
every time it encounters a new file to copy, there is a lot of work the OS does and this is amped up when dealing with a large number of files.

in other words, copy your files to the SSD (or any medium, internal or external) and "it is what it is".
it can't be made to go any faster and it's not like Windows is purposely making it go slow just to tick you off. :)
it's simply the inherent overheads of the OS doing I/O operations.
 
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#5
Bruce said:
first up you have to accept the theoretical speeds they advertise will only occur when the planets are aligned.
then factor in the USB bus speeds, and the way Windows prioritises resource sharing for high demand jobs, and then realise that copying 100 small files is vastly different than copying two large files.
every time it encounters a new file to copy, there is a lot of work the OS does and this is amped up when dealing with a large number of files.

in other words, copy your files to the SSD (or any medium, internal or external) and "it is what it is".
it can't be made to go any faster and it's not like Windows is purposely making it go slow just to tick you off. :)
it's simply the inherent overheads of the OS doing I/O operations.
Click to expand...
Thank you. I guess it is what it is then : D
 
#6
Just to add to what Bruce advised, not all data transfers at the same speed, text only will transfer far faster than say audio or video content, compressed data will also affect transfer speed/s.
 
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