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File.getUsableSpace () does not return the same value as the df command in Linux

I want to print the number of bytes of the total free space of a partition using File.getUsuableSpace(), but it returns a different value than the df command (on Linux).

It is not much different, but it is distinguished by a few megabytes.

What could be?

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2 answers

Is the file that your file instance represents in the same section as the one on which df is running?

From docs : "Returns the number of bytes available to this virtual machine in the section with a name along this abstract path "

The emphasis is mine.

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, getFreeSpace() . Java 1.6, .

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