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

Posted by Jian Lin on Super User See other posts from Super User or by Jian Lin
Published on 2010-01-29T17:23:16Z Indexed on 2010/06/11 16:43 UTC
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windows-7

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speed

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flash-drive

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cache

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copying

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 internal hard drive cache, and will make the copying of file from PC to hard drive appear fast at first.

But for a USB Flash drive, there should be no internal cache for the USB Flash drive itself. Is there a RAM cache for it, so that's why the initial copying seems so fast?

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