Write
Full
PHYS (Physical Address). The interpretation
of
the address is determined by
the
state
of
the
PHYS bit.
If
PHYS
is
set
to
zero (0), the Address field is treated as a logical block address
per normal conventions and all normal position verifications are performed.
The
first
physical
block in
the
specified logical block is written.
To
access all physical blocks, the
Initiator
must
use the
MODE SELECT command
to
set the logical block size equal
to
the
physical block
size (normally 512 bytes).
Otherwise, only the first physical block in each logical block
is
accessible.
If
PHYS is set
to
one (1),
the
Address field
is
treated as a physical block address with
the
Address field defined
as
follows:
Byte
2:
Cylinder Address (MSB)
Byte
3:
Cylinder Address (LSB)
Byte
4:
Head Address
Byte
5:
Sector Address
Address. This field specifies which block
to
write.
Byte Transfer Length. This field specifies the number of bytes
to
be transferred in the
data
phase. This field
is
set
to
021AH (538 decimal) indicating the full physical block length.
Setting this field
to
any other value will generate an ILLEGAL REQUEST sense key.
DRAFT Vendor Unique Command Descriptions
8·23
1/18/93
09:58
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