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Old 01-09-2020, 11:06 PM
awtoner awtoner is offline
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Join Date: Jan 2020
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POST ID # = 1030740
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Default Write speed slows after minutes

Corsair Flash Voyager GTX 1 TB
Lenovo T470 and T480 computers, both with internal SSD's
Windows 10 on both
Copying a 100 or 300 GB TrueCrypt file from the internal SSD to the USB stick

Write speeds to start at 300 MB/s - fantastic.
Speed slows to 60-90 MB/s after a few minutes. Please see attached screenshots.
If I pause the transfer and resume, the speed briefly spike back up before quickly returning to the slower speed.

I had an issue with another manufacturer's USB stick write speed last year which was tied to it being formatted exFAT instead of NTFS. My Voyager was already formatted NTFS, but I tried exFAT as well. Speeds still slow after a few minutes.

It seemed like the write speeds stayed fast longer on the first try of the day but got slower in less time if I retried copies. The Voyager gets warm to the touch during these writes. Thinking perhaps it was related to heating, I tried to cool the Voyager but this didn't help.

I've searched other forums which had several suggestions:
Am I using USB 3.X not 1.0/2.0? Yes.
Tried different USB ports? Yes.
Is it just the cache running out? Clearly not if the transfer speed is fast for a few minutes at 300 MB/s.
I've tried disabling write cache on the drive.
Do I have a background process or antivirus slowing things down? No, the Task Manager shows relatively low CPU and memory utilization. I've also tried booting into safe mode.
I've tried two computers.

Corsair claims 190-470 MB/s max write speed. The single file I'm using should be much faster than many small files.

I'm hesitant to do a hardware swap under warranty unless this is a known issue. I haven't exhaustively updated drivers, BIOS, etc. I was hoping for some guidance before investing a lot more time.

Attached Images
File Type: png T480 original 20191225-142110.png (9.5 KB, 26 views)
File Type: png T480 again 200104-093148.png (9.5 KB, 25 views)
File Type: jpeg T470 after break 20200104-121415.jpeg (16.8 KB, 24 views)
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