HEADRANGE parameter: specify a range of heads

Parameter/ Abbreviations	Description
HEADRANGE(start,end) HDRANGE HEADR HDR HD	Use the HEADRANGE parameter to specify the starting and ending heads to be scanned. For start,end substitute decimal (n) or hexadecimal digits (for example, X'1',X'E') to identify the starting and ending heads to be examined. If you specify only one value, ICKDSF takes the value to be the starting range and defaults the ending range to the device maximum. If you specify HEADRANGE and do not specify CYLRANGE, the specified heads for all the cylinders on a volume or minidisk are processed. For information on specifying the starting and ending cylinders (CYLRANGE) to go with the starting and ending heads, see LIMITS\|CYLRANGE parameter: specify the area of data verification. For information on specifying part of a volume, see RANGE Parameters: specifying part of a volume.
Default:	None.
Restrictions:	The starting value is required for HEADRANGE. If you specify an ending value greater than the maximum for the device, the device maximum is used for the ending value. HEADRANGE applies only when you specify SCAN. HEADRANGE cannot be specified with FROMRANGE\|TORANGE. Because SPEED operates on one cylinder at a time, it is not valid with HEADRANGE, and is ignored if you specify both parameters.

Parameter/
Abbreviations

Description

HEADRANGE(start,end)
HDRANGE
HEADR
HDR
HD

Use the HEADRANGE parameter to specify the starting and ending heads to be scanned.

For start,end substitute decimal (n) or hexadecimal digits (for example, X'1',X'E') to identify the starting and ending heads to be examined. If you specify only one value, ICKDSF takes the value to be the starting range and defaults the ending range to the device maximum.

If you specify HEADRANGE and do not specify CYLRANGE, the specified heads for all the cylinders on a volume or minidisk are processed.

For information on specifying the starting and ending cylinders (CYLRANGE) to go with the starting and ending heads, see LIMITS|CYLRANGE parameter: specify the area of data verification.

For information on specifying part of a volume, see RANGE Parameters: specifying part of a volume.

Default:

None.

Restrictions:

The starting value is required for HEADRANGE. If you specify an ending value greater than the maximum for the device, the device maximum is used for the ending value.

HEADRANGE applies only when you specify SCAN.

HEADRANGE cannot be specified with FROMRANGE|TORANGE.

Because SPEED operates on one cylinder at a time, it is not valid with HEADRANGE, and is ignored if you specify both parameters.