Figure 2-5 shows the I/O status block
(IOSB) for all disk device QIO functions except sense mode. Figure 2-6 shows the I/O status block
for the sense mode function. Figure 2-6 lists the status messages for all functions
and devices. (The OpenVMS system messages documentation provides explanations
and suggested user actions for these messages.)
The byte count is a 32-bit integer that gives
the actual number of bytes transferred to or from the process buffer.
Figure 2-6 IOSB Contents for the Sense Mode Function
The second longword of the I/O status block for
the sense mode function returns information about the cylinder, track,
and sector configurations for the particular device.