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How does one go about limiting the write/read rate of a device, E.G., USB drive, SD card?

Motivation behind this question is covered here (superuser.com).

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cgroups – Janus Troelsen Jul 25 '12 at 21:36
It's a bit difficult, and I don't see how it would be useful. If your data can go through a pipe, pipe through pv. The slower step will naturally limit the rate of the transfer. What problem are you trying to solve? – Gilles Jul 25 '12 at 23:05
@Gilles experimentation, I'm thinking of an application which can't pipe data. – Lewis Norton Jul 26 '12 at 8:21

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