// - Subtract 80 characters for the filename and file segment
// - Divide by 42 to get the number of block identifiers ('hash\+size\ ' is 32+1+8+1)
// - Assume each block is full, multiply by 64 MiB
// - Subtract 80 characters for the filename and file segment
// - Divide by 42 to get the number of block identifiers ('hash\+size\ ' is 32+1+8+1)
// - Assume each block is full, multiply by 64 MiB