IOSB Contents shows the I/O status block (IOSB) for all disk
device QIO functions except sense mode.
IOSB Contents for the Sense Mode Function shows the I/O status block for the sense mode function.
IOSB Contents for the Sense Mode Function lists the status messages
for all functions and devices. (The OpenVMS system messages documentation
provides explanations and suggested user actions for these messages.)
Figure 7 IOSB Contents
The byte count is a 32-bit integer that gives the actual number
of bytes transferred to or from the process buffer.
Figure 8 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.