HP C737990900 - Manual (Page 109)

Commands 109
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The Partition User Text Label is a user level identifier for the partition specified
in the CDB Partition Number field
The Load/Unload at Partition attribute indicates whether the media can be
loaded or unloaded at the Partition specified in the CDB Partition Number
field. If loads/unloads are enabled for the specified partition, the value of this
parameter shall be 1h. If loads/unloads are not enabled for the specified
partition, the value of this parameter shall be 0h. If Load/Unload at Partition is
disabled, then loads/unloads are performed at the beginning of the media
instead of at the specified partition. If this attribute is not set by a host then the
default action will be to load/unload at the beginning of media.