iPhone - Free space left on device reported incorrectly (+- 200 Mb difference)

Question

I use this method to get the free space on the disk, extracted from a code found after some researches.

    float freeSpace = -1.0f;  
    NSError* error = n         


        

Answer 1

It appears that sometimes the free space is reported incorrectly https://discussions.apple.com/thread/2566412?threadID=2566412

EDIT: I tried the following code and noticed that on my device, there was also a ~200MB discrepancy. Maybe that storage is reserved for the system somehow?

NSDictionary *fsAttr = [[NSFileManager defaultManager] fileSystemAttributesAtPath:NSHomeDirectory()];

unsigned long long freeSpace = [[fsAttr objectForKey:NSFileSystemFreeSize] unsignedLongLongValue];

NSLog(@"%llu", freeSpace);
NSLog(@"%f", freeSpace / 1073741824.0);