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How can I set deadline as the I/O scheduler for USB Flash devices by using udev rules? [duplicate]

Possible Duplicate: Udev rule is not working I have set CFQ as the default I/O scheduler. I often get bad performance when I write data into a Flash device. This is resolved if I use ...
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How does data I/O takes place on USB Flash Memory?

I want to know how is data I/O takes place on flash drives which are typically EEPROM's . I thought so as I was writing a C Program that involves file handling . For a normal HDD , that would ...