7. ATAPI Packet Command Specification
SPACE
SONY AIT-1 Turbo drive SDX-470V series Ver.1.0
7-72
7.21. SPACE 11h
Bit
Byte
7 6 5 4 3 2 1 0
0
Operation Code (11h)
1
Reserved Code
2
(MSB)
3
4
Count
(LSB)
5
Reserved
6
Reserved
7
Reserved
8
Reserved
9
Reserved
10
Reserved
11
Reserved
The SPACE command is used to position to a relative filemark or to end of data depending on the Count and
Code. Both forward and reverse filemark positioning are provided.
Table 7-60: Space Code
Code Description
000b Blocks
001b Filemarks
011b
End of Data
100b Setmarks
101b-111b Reserved
When spacing over filemarks, the
Count
field specifies the number of filemarks to be spaced over in the current
partition. A positive value N in the
Count
field shall cause forward positioning (toward
end-of-partition)
over N
filemarks ending on the
end-of-partition
side of the last filemark. A zero value in the
Count
field shall cause no
change of logical position. A negative value - N (two's complement notation) in the
Count
field shall cause reverse
positioning (toward
beginning-of-partition
) over N filemarks ending on the
beginning-of-partition
side of the last
filemark.
If
end-of-data
is encountered while spacing over filemarks, “Check Condition” status shall be returned, the Sense
Key shall be set to BLANK CHECK, and the Valid bit shall be set to one in the sense data. Additionally, the
EOM
bit shall be set to one if
end-of-data
is encountered at or after
early-warning
. The Information field shall be set to
the difference (residue) of the requested count minus the actual number of filemarks spaced over.
If the
end-of-partition
is encountered while spacing forward over filemarks, “Check Condition” status shall be
returned, the Sense Key shall be set to MEDIUM ERROR, the EOM bit shall be set to one, and the Valid bit shall
be set to one. The Information field shall be set to the difference (residue) of the requested count minus the actual
number of filemarks spaced over.
If
beginning-of-partition
is encountered while spacing over filemarks in the reverse direction, “Check Condition”
status and the Sense Key to NO SENSE shall be set. The EOM and Valid bits shall be set to one, and the
Information field set to the total number of filemarks not spaced over (the requested number of filemarks minus the
actual number of filemarks spaced over).
When spacing to
end-of-data
, the count field is ignored. Upon successful completion, the medium shall be
positioned such that a subsequent write operation would append to the last logically recorded information.
If
end-of-partition
is encountered while spacing to
end-of-data
, “Check Condition” status shall be returned, the
Sense Key shall be set to MEDIUM ERROR, the EOM bit shall be set to one, and the Valid bit shall be set to zero.
Содержание AIT-SDX470
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