Maxtor 10K III User Manual
SCSI Description
Maxtor Atlas 10K III
5-175
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213
The WRITE LONG and READ LONG commands allow the initiator to issue raw
reads and writes of physical sectors addressed as logical blocks with an assumed sector
length of 512 bytes. These commands are used to verify the correction capability of
the drive's ECC and to create defects of a known kind and location to verify the drive's
recovery and bad sector handling policies. The data format and field descriptions are
shown in Table 5-220 and Table 5-221 respectively.
reads and writes of physical sectors addressed as logical blocks with an assumed sector
length of 512 bytes. These commands are used to verify the correction capability of
the drive's ECC and to create defects of a known kind and location to verify the drive's
recovery and bad sector handling policies. The data format and field descriptions are
shown in Table 5-220 and Table 5-221 respectively.
Table 5-220
WRITE LONG Command Descriptor Block-Data Format
Table 5-221
WRITE LONG Command-Field Descriptions
*
5
>
'
%
$
0
Operation Code (3Fh)
1
Reserved
RelAdr
2 - 5
Logical Block Address
6
Reserved
7 - 8
Byte Transfer Length (562)
9
Control
&*2,
"()**+
RelAdr
Relative Address. This drive does not support this feature; the field must
be 0.
be 0.
Logical Block
Address
The address of the first logical sector where the Write operation will occur.
Byte Transfer
Length
Must be 562. This value reflects the number of bytes spanned by the ECC,
including the ECC itself, rounded up to the next word (this is easiest un-
derstood in bits: 4096 data bits + 1 force error bit + 15 Logical Block Ad-
dress bits + 16 cross check bits + 2 pad bits + 360 ECC bits + 6 pad
bits that are not written to media but are only needed for transfer = 4496
bits or 562 bytes). Any other value in this field results in a CHECK CON-
DITION status and the appropriate sense data.
including the ECC itself, rounded up to the next word (this is easiest un-
derstood in bits: 4096 data bits + 1 force error bit + 15 Logical Block Ad-
dress bits + 16 cross check bits + 2 pad bits + 360 ECC bits + 6 pad
bits that are not written to media but are only needed for transfer = 4496
bits or 562 bytes). Any other value in this field results in a CHECK CON-
DITION status and the appropriate sense data.
The initiator should first issue a READ LONG, then modify the data portion
only, and then issue a WRITE LONG. It is also recommended that the drive
be reformatted after these commands are used.
only, and then issue a WRITE LONG. It is also recommended that the drive
be reformatted after these commands are used.