#include <sys/param.h>   
#include <sys/mount.h>
long long freeSpace() {
    struct statfs buf;
    long long freespace = -1;
    if(statfs("/", &amp;buf) &gt;= 0){
        freespace = (long long)buf.f_bsize * buf.f_bfree;
    }

    return freespace;
}

+(float)getTotalDiskSpaceInBytes {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    struct statfs tStats;
    statfs([[paths lastObject] cString], &amp;tStats);
    float totalSpace = (float)(tStats.f_blocks * tStats.f_bsize);   

    return totalSpace;
}

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