Fujitsu MBC2073RC, MBC2036RC, MBA3300RC, MBA3147RC, MBA3073RC Maintenance, Diagnostic Commands

4.4 Maintenance, Diagnostic Commands

When abnormal termination for reasons other than ILLEGAL REQUEST [=5] / Invalid field in CDB [=24-00] or ILLEGAL REQUEST [=5] / Invalid field in parameter list [=26-00] occurs, the HDD indicates that downloading of the new microcode failed, and it is therefore necessary for the INIT to quickly download the new microcode.

When downloading of microcode is completed, the HDD generates a UNIT ATTENTION condition for all the INITs except the INIT that issued the WRITE BUFFER command. At this time, the additional sense code/additional sense code qualifier indicates "Microcode has been changed [=3F-01]."

When the HDD is checked and downloading of the microcode is judged to be possible, the HDD may be in the Not Ready state (the state in which the spindle motor is not rotating). In this event, the HDD starts the motor, then saves the microcode to flash ROM and the system area to disk media. Then, the HDD stops the motor and returns to the Not Ready state.

During downloading of microcode, the supply of power to the drive must not be cut off (such as an instantaneous power failure). If a power failure occurs, for instance, while downloading the microcode to the FLASH-ROM, the HDD may be severely damaged. The worst-case scenario in this event would be an inoperable drive.

(6) Mode = 0, 1, 1, 0 : Microcode Download with offsets, without saving

In this mode the INIT may split the transfer of the controller's microcode or control information over two or more WRITE BUFFER commands.

If the last WRITE BUFFER command of a set of one or more commands completes successfully, the microcode or control information shall be transferred to the control memory space of the HDD.

Since the download microcode or control information may be sent using several commands, when the HDD detects the last download microcode with offsets, the HDD shall perform the verification of the complete set of downloaded microcode or control information prior to returning GOOD status for the last command. After the last command completes successfully the HDD generates a unit attention condition for all INITs except the one that issued the set of WRITE BUFFER commands. When reporting the unit attention condition, the HDD sets the additional sense code to MICROCODE HAS BEEN CHANGED.

"0" must be specified in the "Buffer ID" field.

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