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Does hard disk drive get any damage if I open a file, append some short data to it and close it many times in a second?
A program actually does that, not me...

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Let me guess, your hard drive crashed? Or why the unaccept, if I may ask? ;) –  slhck May 8 '12 at 15:53
    
@slhck I was just looking through my questions, and the other answer seemed better to me... –  Oleh Prypin May 8 '12 at 16:56
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2 Answers

up vote 1 down vote accepted

Any file operation will decrease the lifespan of your HDD.

Considering if it is "harmful" is subjective, but you could easily compare it to your browser caching pages.

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No, why should it? Disks are made for reading and writing. It doesn't harm more or less than any other activity on your disk.

You also won't overload your disk (or anything like that) since the controller will determine how many read/write operations it can take.

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