Maxtor 53073H4, 51536H2, 52049H3, 546106 specifications CommandRegister

HOST SOFTWARE INTERFACE

CommandRegister

Contains code for the command to be performed. Additional command information should be written to the task file before the Command register is loaded. When this register is written, the BUSY bit in the Status register sets, and interrupt request to the host clears; invalid commands abort. (Detailed information on interface commands is given in Section 7.) Hex values for valid command formats follow:

Read Commands
Read Sector(s)	20h	Normal reads; retries enabled
	21h	Normal reads; retries disabled
	22h	Read Long; retries enabled
	23h	Read Long; retries disabled
Read Verify Sector(s)	40h	Retries	enabled
	41h	Retries	disabled
Read Sector Buffer	E4h
Read Multiple	C4h
Read DMA		C8h
	C9h	No retries
Write Commands
Write Sector(s)	30h	Normal writes; retries enabled
	31h	Normal writes; retries disabled
	32h	Write Long; retries enabled
	33h	Write Long; retries disabled
Write Verify Sector(s)	3Ch
Write Sector Buffer	E8h
Write Multiple	C5h
Write DMA	CAh
	CBh	No retries
Mode Set/Check Commands
Set Features	EFh
Set Multiple Mode	C6h
Read Native Max Address	F8h
Set Max Mode	F9h
Power Mode Commands
Standby Immediate	94/E0h	Stops drive spindle; do not change time-out value
Idle Immediate	95/E1h	Starts spindle; do not change time-out value
Standby	96/E2h	Stops spindle; change time-out value
Idle	97/E3h	Starts spindle; change time-out value
Check Power Mode	98/E5h
Set Sleep Mode	99/E6h
Initialization Commands
Identify Drive	ECh
Initialize Drive Parameters	91h
Re-calibrate	1xh
Seek, Format, and Diagnostic Commands
Seek	7xh
Format Track	50h
Execute Drive Diagnostic	90h
S.M.A.R.T. Commands
Execute S.M.A.R.T.	B0h

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