-ib:
Specifies the size of the input buffer. The number that can be specified is an integer value in the range of 2 to 8, for example
-Ib 2
Is specified, the size is 4K x 2 = 8K bytes. The default size is 32K bytes (equivalent to 8 in the specified value).
-vb :
Specifies the size of the transfer buffer. The specifiable numerical value is an integer value in the range of 14 to 37. This specifies how many buffers one sector will take, so for example
-vb 14
Specifies that 14 transfer buffers are allocated. By default, 37 transfer buffers are allocated. However, this may be less depending on the system memory usage.
The size of the input buffer allocated and the number of transfer buffers are displayed at the bottom right of the screen as shown below after starting the program.
Buffer: 02/07
Here, the numerator is the size of the input buffer (4K units), and the denominator is the number of transfer buffers. The number of transfer buffers displayed is an integer value divided by 2.