That is down to the unfortunate difference in how storage media capacities are labelled by the vendors, and how in almost all other applications it is calculated.
When a storage vendor labels it 32gb, it is 32x10^9 = 32x1000x1000x1000 = 32,000,000,000 bytes
When a computer calulate a file to be 32gb it is 32*2^30 = 32x1024x1024x1024 = 34,359,738,368 bytes and therefore will not fit on 32gb drive.
The 29,6 you see, is as calculated by a computer. 32 metric gb is roughly 29,8 binary gb, so only about 200mb is lost to formatting, not 2,4gb.
Just an explanation. Doesn't really help now, but perhaps for the future.