Disk read
Reads bytes from the disk.
A1 [in,1u]A2 [in,1u]A3 [out,1b]AY [in,4i]BX [in,4u]BY [in,4i(addr)->1[size]]This message allows you to read data from the disk inserted into given slot.
If A3 returns false, it doesn't mean that all the operation failed.
Several bytes could been read.