Commands—Introduction 35
Commands—Introduction
■ The sense key specific bit is set and the sense key specific bytes will be a
field pointer.
■ The command/data bit is set, indicating that the illegal parameter was in
the command.
Note Command descriptor blocks are scanned from left (bit 7) to right
(bit 0), and down (from byte 0 to byte n). The field pointer will
be set to point to the first bit of the first illegal field encountered
using this scanning route. In some cases, where multiple fixed
fields are contiguous, the field pointer might be set to point to the
first bit of the first fixed field in the group of fixed fields, whereas
the actual illegality may lie in a later bit.
Media Access Check
This checks if the drive is able to perform media access commands. If the
media is inaccessible then
CHECK CONDITION status is reported with a sense
key of
NOT READY. The additional sense will be set to one of the codes
associated with the
NOT READY key.
