Supported Message Functions - Hitachi HUS151473VL3800 - Ultrastar 73.4 GB Hard Drive Specifications

19.2 Supported message functions

The implementation of the supported messages will also include the following functions.
• Retry SCSI Command or STATUS phase
The retry will be caused by the following error condition.
- The drive detected SCSI bus parity error (Command phase)
- The drive receives INITIATOR DETECTED ERROR MESSAGE during or at the conclusion of an information
transfer phase (Command Data Out or Status Phase)
Note: The Initiator may send the INITIATOR DETECTED ERROR message as a result of an Initiator detected SCSI
Bus parity error or an internal error.
• Retry MESSAGE IN phase
- The retry will be caused by the receipt of a MESSAGE PARITY ERROR message immediately following a MES-
SAGE IN phase.
Note: The Initiator may send the MESSAGE PARITY ERROR message as a result of an Initiator detected SCSI Bus
parity error during the Message In phase.
• Receipt of multiple Identify messages
- The Initiator is allowed to send multiple IDENTIFY messages out in order to toggle the disconnect/reconnect per-
mission bit. This may be used to selectively enable or disable disconnect/reconnect permission during portions of a
command. Note that this function does not affect the operation of the Forced Disconnect function.
• MESSAGE REJECT during Target Disconnection
- If the Initiator rejects the SAVE DATA POINTER message, the drive will disable disconnect/reconnect permission.
This is equivalent to receiving an IDENTIFY message with bit 6 equal to zero. This will cause the drive to inhibit
the pending disconnection.
- If the Initiator rejects the DISCONNECT message, the drive will not disconnect but may attempt to disconnect at a
later time. This function may be used to selectively disable disconnection during portions of a command.
Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
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