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The speed of copying a file from a PC to a USB Flash drive started at 30MB/s and decreased to 5.8 MB/s, why?

Fresh3 days ago
Mar 15, 20266644 views
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Problem

If I copy a 8GB file from the PC to a USB Flash Drive, the speed will start at around 30 MB/s... maybe 28 MB/s, and then gradually, after a minute, it will go down to 15 MB/s and finally settle down at 5.8 MB/s. But I thought if it is a hard drive, then probably there is the RAM cache and also the …

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Fix for: The speed of copying a file from a PC to a USB Flash drive started at 30MB/s and decreased to 5.8 MB/s, why?

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Windows will buffer the writing for as long as it can, so the first chunk will write faster than the rest. The display is showing the over-all average so it is initially high and slowly drops down towards the actual write speed of the flash drive wh…

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