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    Question :
    How can I find out how much free space is available on disk?
    Category C Interview Questions
    Rating (0.3) By 9 users
    Added on 11/17/2011
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    There is no portable way. Under some versions of Unix you can call statfs. Under MS-DOS, use interrupt 0x21 subfunction 0x36, or perhaps a routine such as diskfree. Another possibility is to use popen to invoke and read the output of a ``disk free'' command (df on Unix).
    (Note that the amount of free space apparently available on a disk may not match the size of the largest file you can store, for all sorts of reasons.)

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