This looks great, I'd consider limiting the number of significant digits to 3 in the human readable format. In the above example it would translate to:
Space used (live): 1.46 TiB Space used (total): 1.46 TiB Bytes repaired: 0.00 KiB Bytes unrepaired: 4.31 TiB Bytes pending repair: 0.000 KiB I just think with human readable format we just expect to have a grasp view of the stats and 4th significant digit has very little meaning in that case. thanks, Jacek