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Command Specifications
This command reads the logical data block data and its ECC byte, specified in the
"Logical block address" field in the CDB, from the disk media and transfers it to
the INIT. Normally, this command is used in combination with the WRITE
LONG command to perform checks of the ECC function. The operation object in
this command is 1 data block only.
Remark The Pad Byte and Sync Byte patterns are not included in the transfer
When "0" is specified in bit 1 of CDB byte 1, the "CORRCT (Corrected)" bit, the
IDD does not implement ECC correction processing of data read from the disk
media. When "1" is specified in the "CORRCT (Corrected)" bit, data errors that
can be corrected by ECC are transferred to the INIT after being corrected in the
IDD's data buffer.
When the "Transfer byte length" specifies zero, this command executes a seek
operation of the cylinder/track existing in the logical data block which is specified
in the "Logical block address" field in the CDB., then is terminated without data
being transferred to the INIT.
When a length (other than zero) which does not match the data format on the disk
media is specified in the "Transfer byte length" field in the CDB, this command is
terminated with a CHECK CONDITION status without executing a data transfer
to the INIT. At this time, the sense data indicate the following contents and the
INIT can determine the correct "Transfer byte length" from their contents.
•
Sense Key
•
Additional sense code/
Additional sense code qualifier
•
"VALID" Bit
•
"ILI" bit
•
Information Field: ("Transfer byte length in the CDB) –
Remark: The calculation formula for the information field expresses 1 logical
Error recovery processing during execution of this command is in accordance
with the specifications in (Page code 1: Read/Write Error Recovery Parameter,
Page code 21: Additional error recovery parameters).
•
The ARRE flag and the DTE flag are not applied.
•
The TB flag is treated as if "1" was specified.
4-198
data.
(Original "Transfer byte length")
data block as n physical sectors, and when negative, as a complement
of 2.
: 05 = ILLEGAL REQUEST
: 24-00 = Invalid field in CDB
: "1"
: "1"
C141-C012
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