Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E 133
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Sense Data is valid after this command is executed and Completion Status is sent. If the Address Valid bit in
the Sense Data is true (1), the Sense Data Logical Block Address (Information bytes) points to the last
Logical Block accessed by the disc drive. If the Address Valid bit in the Sense Data is false (0), the Sense
Data Logical Block Address bytes are not valid.
The disc drive contains a large buffer and implements an optional “prefetch” and segmented cache function
whereby the requested read data is read into the buffer, plus an additional amount, depending on the cache
control parameters. See paragraph “Prefetch and multisegmented cache control “ in the individual Product
Manual for more information on this.
This command is terminated with a Reservation Conflict status and no data is read if any reservation access
conflict (see Section 5.2.1.8) exists.
If any of the following conditions occur, this command shall be terminated with a Check Condition status, and
if extended sense is implemented, the Sense Key shall be set as indicated in the following table. This table
does not provide an exhaustive enumeration of all conditions that may cause the Check Condition status.
Condition
Sense Key
Invalid Logical Block Address
Illegal Request (see note)
Target reset since last command from this initiator
Unit Attention
Unrecoverable read error
Medium Error
Recovered read error
Recovered Error
Note.
The extended sense Information Bytes shall be set to the Logical Block Address of the first
invalid address.
