Ubuntu: Why slow is recorded on the memory card?

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Colleagues, prompt, please, why the data on the drive is written slowly?

If you believe the speed indicator recording in Ubuntu, then in the beginning of the recording speed is 5 MB/sec, and the end falls in 10 times up to 500 KB/sec.
A USB 2.0 port on the motherboard Asus M2N-MX. The picture does not change depending on the port or pendrive. In win 7 data is recorded at a speed of 10 MB/sec according to the speed indicator.
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6 Answers

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Had this problem on one of the machines. It was solved by adding "pci=routeirq" to the grub parameters. For this reason there is a page on launchpad. bugs.launchpad.net/gvfs/+bug/197762 and brainstorm.ubuntu.com/idea/15648/
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Don't forget about deferred entry. The speed may seem different because settings delayed write in different systems different.
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1. What kernel?
2. libccid worth?
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12309?
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manifests itself on only one drive or tried a bunch of different? External USB disks tried? If the problem is only with one stick, then throw exhaust `dmesg | tail` after the flash drive has detected in the system
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By the way. On one machine recovered by connecting to another port. Somehow that's so weird. They're all usb 2.0, but only one works.
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