Initialize Element Status - 07h

The library will determine element status (full or empty) as well as barcode label information (volume tags) for the media. The library will accept and respond with good SCSI status without performing the operation. The library establishes inventory status per the Automatic Inventory setting (enabled or disabled).

If the Automatic Inventory option is enabled, the element status will be established upon each library initialization procedure (library power-up).

If Automatic Inventory option is disabled, the element status is assumed to be correct or correct via library management inventory functionality.

Results of the status initialization will be buffered by the library for retrieval via the READ ELEMENT STATUS command. Element status and barcode label information is retained by the library across power cycles.

This command can be used to gather status for all the elements, and should be issued whenever the library indicates that element status may have changed, such as after a power cycle or door opening and closing. It should then be followed by a READ ELEMENT STATUS command to retrieve the status.

The INITIALIZE ELEMENT STATUS CDB format is shown in the following table.

Table 1: INITIALIZE ELEMENT STATUS CDB format

Bit Byte	7	6	5	4	3	2	1	0
0	Op Code (07h)
1	Logical Unit Number			Reserved
2	Reserved
3	Reserved
4	Reserved
5	NBL	Control

Field	Description
No Barcode Labels (NBL)	A value of 0 indicates that the specified elements will be checked for all relevant status, including bar code labels. A value of 1 indicates that elements will be checked for media presence only (no bar code labels). Note: Tape libraries that have barcode label scanners/readers installed will always establish barcode label element status, regardless of the NBL bit setting.