Sandisk Extreme USB 3.0 slow/weird writing speeds

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lenny23

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Dec 1, 2012
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Hello everybody.
I have a Sandisk Extreme USB 3.0. Nice drive. Worked great a few months ago when I bough it, really fast read and write. But now only the read is blazing fast. The writing speed is bad and weird.
The test I did: writing 1 file, 1.45 GB, ports and directives, check out the results:

d7db26632409483.png

With better performance on, it should be faster but it becomes slower. And works faster on the USB 2.0 rear port than the 3.0. It's crazy. I don't understand. Drivers are fine. I have 2 external USB 3.0 HDDs that work great.
I remember it was faster a few months ago. I didn't use it a lot, actually it's almost new.
Any ideas???

Cheers. :)
 
Solution
I've been having the same problem. Super fast then drops down to like 4.7 MB/s or even KB/s then jumps up to 25 MB/s on repeat.
When I got it, the speeds were in the 70s and higher then after a couple weeks this started happening. Been a few months now.

lenny23

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Dec 1, 2012
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I just did a test with CrystalDiskMark: quick removal, usb 3.0 rear port, 2 GB size, speed: 90.84 MB/S. What the hell?? No way, it's working way slower than that, I'm getting just 33. :/
 

littleleeroy

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Nov 13, 2017
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I've been having the same problem. Super fast then drops down to like 4.7 MB/s or even KB/s then jumps up to 25 MB/s on repeat.
When I got it, the speeds were in the 70s and higher then after a couple weeks this started happening. Been a few months now.
 
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