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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
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1/18/93
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