USB drive is a shared resource or not?


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Shared resource I mean a resource that can use two or more processes simultaneously.


The question arose: when processing multiple text files on the flash drive, if you do it mnogopotochnoy — the processing speed decreases two times in comparison with serial. There is a suspicion that it is due to unshared the write process to the drive.


So, USB drive is a shared resource or not?
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See this link: www.xbitlabs.com/articles/storage/display/ssd-roundup_12.html
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but in this picture the figures for the speed of multi-threaded record on SSD drives:
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\rwww.xbitlabs.com/misc/picture/?src=/images/storage/ssd-roundup/mtw_table.png&1=1
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When you increase the number of writing threads on some disks write speed drops slightly and others quite noticeable.
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I believe flash memory is a shared resource and the speed at multi-threaded record depends on an internal stuffing of the device.
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