Library /sys$common/syshlp/helplib.hlb  —  LD  Driver functions, Enable protect
 	This function write-protects a drive:

 	Function:	IO$_LD_CONTROL

 	P6 = Subfunction: LDIO$K_ENABLE_PROTECT

 	IOSB word 0 = status

 	Errors returned:

 	SS$_NORMAL	Successful completion
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