Write Long Command Descriptor Block-Data Format; Write Long Command-Field Descriptions - Maxtor ATLAS 10K III Product Manual

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.
T a b l e 5 - 2 2 0 WRITE LONG Command Descriptor Block-Data Format
$ K V
 
$ [ V G
0
1
2 - 5
6
7 - 8
9
T a b l e 5 - 2 2 1 WRITE LONG Command-Field Descriptions
( K G N F
Relative Address. This drive does not support this feature; the field must
RelAdr
be 0.
Logical Block
The address of the first logical sector where the Write operation will occur.
Address
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
Byte Transfer
bits or 562 bytes). Any other value in this field results in a CHECK CON-
Length
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.
  
Operation Code (3Fh)
Reserved
Logical Block Address
Reserved
Byte Transfer Length (562)
Control
& G U E T K R V K Q P
SCSI Description
 
RelAdr
Maxtor Atlas 10K III

5-175