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6.8
TRANSLATE
(0F H )
BIT
BYTE
07
06
05
04
03
02
01
00
------1------1------1------1------1------1------1------
00
0
0
0
0
1
I I I
01
Logical Unit Number
(MSB)
Logical Block Address
02
03
04
05
Loglcal Block Address
Logical Block Address
(LSB)
Reserved (13)
Reserved (0)
1
Flag
1
Link
Figure 6-14.
TRANSLATE Command
This command performs a logical address to physical address
translation and returns the physical location of the requested
block address in a cylinder, head, bytes from index format. This
data can be used to build a defect list for the FORMAT command.
To translate logical blocks, the ACB-5500 physically seeks the
designated block and reads its physica"l location.
If there is a
data error in the
10
field, an error status will be returned.
It
is then necessary to TRANSLATE the blocks before and after the
targeted block and use the track format shown in Tables 5-3 and
5-4 to determine the location of the target block.
The presence
of formatted (skipped) defects will require a more complicated
algorythm for determination of the error location.
Eight bytes are returned in the format of defect descriptors
required by the FORMAT UNIT command, Figure 6-15.
5005134-130
6-23
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