about print_disksize

["yangruifeng.09209@xxxxxxx" <yangruifeng.09209@xxxxxxx>]

Hi All，

In print_disksize(target.c)
mb = ((size / 512) - (((size / 512) / 625) - 974)) / 1950; 

Why this? 
512、625、974、1950 mean what?

Why not like this,
Mb = size / (1000 * 1000)?Simpler and easier to understand

Thanks，
Ruifeng Yang
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